CN211058999U - Piston pump and clamping device having the same - Google Patents

Abstract

The utility model proposes a piston pump and a clamping device having the piston pump, wherein the piston pump comprises an oil storage bag, a main body component, a driving component, and a piston. The main body component has a first chamber, a second chamber, an exhaust passage, and an exhaust blocking member. The exhaust passage connects the first chamber and the oil storage bag. When the piston is subjected to a reaction force, and if the driving component continues to push against the first chamber, the oil and air in the first chamber will flow back to the oil storage bag through the exhaust passage. The clamping device has the aforementioned piston pump, and controls the action of the clamping jaws to clamp by means of the aforementioned piston pump. Thus, even if the oil in the oil storage bag contains air and flows into the main body component, the air can be discharged back into the oil storage bag through the exhaust passage, so that the piston pump can resist the reaction force and enable the clamping device to clamp the object.

Description

Piston pump and clamping device having the same

technical field

The utility model relates to a piston pump and a hand tool, in particular to a piston pump which is moved by a hydraulic pushing element and a clamping tool with the piston pump.

Background technique

The prior art piston pump includes an oil storage bag, a drive assembly, and a piston. When the drive assembly is running, the oil in the oil storage bag is drawn out, and then the oil is pressurized and driven into the piston, which can push the piston to move. In the current production process of the piston pump, although the oil is put into the oil storage bag and then vacuumized and then assembled and sealed with the driving component, it is still impossible to completely avoid the air in the oil storage bag. If the oil storage bag contains air, when the drive assembly draws the oil in the oil storage bag, it may be drawn out along with the air. However, due to the compressibility of air, the air is also pressurized during the process of pressurizing the oil by the drive assembly, so the volume is compressed, so that the total volume of oil and air flowing into the piston is not enough to move the piston. In other words, the piston pump may be rendered inoperative when the drive assembly contains air.

In view of this, a better improvement solution is proposed, which is an urgent problem to be solved in the industry.

Utility model content

The main purpose of the present utility model is to provide a piston pump and a clamping device having the piston pump, which can discharge the air in the circulation part, so that the piston pump can also push the piston to move when the piston pump is subjected to reaction force.

In order to reach the above-mentioned purpose, the piston pump proposed by the present utility model has:

an oil storage bag;

A body assembly having:

a first main channel, which has a first inlet section, a first branch section, and a first outlet section communicated in sequence; the first inlet section is also communicated with the oil storage bag;

a first inlet blocking member, which is movably disposed in the first main channel and selectively blocks the first inlet section and the first branching section;

a first outlet blocking member, which is movably disposed in the first main channel, and selectively blocks the first branch flow section and the first outlet section;

a second main channel, which has a second inlet section, a second branch section, and a second outlet section communicated in sequence; the second inlet section is also communicated with the oil storage bag;

a second inlet blocking member, which is movably disposed in the second splitting section and selectively blocks the second inlet section and the second splitting section;

a second outlet blocking member, which is movably disposed in the second outlet section and selectively blocks the second split section and the second outlet section;

a first chamber, which is communicated with the first splitting section;

a second chamber, which is communicated with the second splitting section; the diameter of the second chamber is smaller than the diameter of the first chamber;

an exhaust passage, the two ends of which are respectively connected to the first chamber and the oil storage bag;

an exhaust blocking member that selectively blocks the exhaust passage;

a drive assembly having:

a driving column, which is movably penetrated through the first chamber and the second chamber, and has a first end and a second end opposite to each other; the second end of the driving column is located in the second chamber indoors, and seal the second chamber;

a stroke control ring, which is fixed on the drive column and located in the first chamber; the stroke control ring seals the first chamber;

a connecting channel, two ends of which are respectively communicated with the first chamber and the second chamber;

a connecting channel blocker that selectively blocks the connecting channel;

a power component connected to the first end of the drive column and used for driving the drive column to move; and

a piston movably disposed on the body assembly and having:

An oil storage chamber is communicated with the first outlet section and the second outlet section.

The clamping device proposed by the utility model has:

a shell;

A piston pump as aforesaid, which is fixed in the outer casing;

a first clamping member fixed to the piston of the piston pump; and

A second clamping piece fixed on the outer casing; a clamping distance is formed between the first clamping piece and the second clamping piece, and the size of the clamping distance is controlled by the position of the piston of the piston pump .

Therefore, the advantage of the present invention is that even if the oil in the oil storage bag contains air and flows into the main body assembly, the air can be discharged back into the oil storage bag through the exhaust passage, so the piston pump can resist the reaction force, and can make the clamping device Clamp items.

In a piston pump as previously described:

The first main stream also has:

a first split abutting surface located between the first inlet section and the first split section and facing the first split section; and

a first outlet abutting surface, which is located between the first split section and the first outlet section and faces the first outlet section;

The second sprue also has:

a second split abutment surface located between the second inlet section and the second split section and facing the second split section; and

a second outlet abutting surface located between the second split section and the second outlet section and facing the second outlet section; and

The body component also has:

A first splitting section elastic member disposed in the first splitting section and used to push the first inlet blocking member against the first splitting abutting surface, thereby blocking the first inlet section and the the first splitting section;

A first outlet section elastic member disposed in the first outlet section and used to push the first outlet blocking member against the first outlet abutting surface, thereby blocking the first split section and the the first exit segment;

A second splitting section elastic member disposed in the second splitting section and used for pushing the second inlet blocking member against the second splitting abutting surface, thereby blocking the second inlet section and the the second split section; and

A second outlet section elastic member is disposed in the second outlet section and used to push the second outlet blocking member against the second outlet abutting surface, thereby blocking the second split section and the the second outlet section.

In a piston pump as previously described:

The body component also has:

a first abutting member fixed in the first outlet section, and both ends of the elastic member of the first outlet section abut against the first abutting member and the first outlet blocking member respectively; and

a second abutting member fixed in the second outlet section, and two ends of the elastic member of the second outlet section are respectively abutted on the second abutting member and the second outlet blocking member;

Both ends of the first splitting segment elastic member abut against the first inlet blocking member and the first outlet blocking member respectively; and

Both ends of the second splitting segment elastic member abut against the second inlet blocking member and the second outlet blocking member respectively.

In a piston pump as previously described:

The body component also has:

a chamber abutting surface, which is located between the first chamber and the second chamber and faces the first chamber;

The drive assembly also has:

a driving elastic piece sleeved on the driving column, and two ends of the driving elastic piece respectively abut on the cavity abutting surface and the stroke control ring; and

This power pack has:

A cam abuts against the first end of the driving column, so that when the cam rotates, the driving column can be driven to move.

In a piston pump as previously described:

The connection channel has:

a first communication section and a second communication section, which are in communication; and the first communication section is communicated with the first chamber, and the second communication section is communicated with the second chamber;

a connecting channel abutting surface, which is located between the first communication section and the second communication section and faces the second communication section; and

The communication channel blocking member is movably disposed on the second communication section and selectively abuts against the abutment surface of the communication channel, thereby blocking the first communication section and the second communication section.

In a piston pump as previously described:

Both the first communication section and the second communication section extend along the axial direction of the driving column; and

The channel also has:

A radial communication section extends along the radial direction of the driving column, and the first communication section communicates with the first chamber through the radial communication section.

In the aforementioned piston pump, the driving assembly further has an elastic pin, which is fixed in the second communication section and protrudes from the second end of the driving column.

In the piston pump as previously described, the stroke control loop has:

a plane part, which is an annular plate body and is sleeved on the driving column; and

A cover part is in the shape of a hollow cylinder and surrounds the driving column, and one end is fixed on the outer edge of the plane part.

In a piston pump as previously described:

This exhaust channel has:

A first exhaust section and a second exhaust section communicate with each other; the first exhaust section is also communicated with the first chamber, the second exhaust section is also communicated with the oil storage bag, and the exhaust section an air blocking member movably disposed in the second exhaust section; and

an exhaust abutting surface located between the first exhaust section and the second exhaust section and facing the second exhaust section; and

The body component also has:

An exhaust elastic member is disposed in the second exhaust section and used to push the exhaust blocking member against the exhaust abutting surface, thereby blocking the first exhaust section and the first exhaust section. Second exhaust section.

In the aforementioned piston pump, the main body assembly also has:

a return passage, the two ends of which are respectively connected to the oil storage chamber of the piston and the oil storage bag; and

A backflow blocker that selectively blocks the backflow channel.

In a piston pump as previously described:

The return channel has:

A first return section and a second return section are connected; the first return section is also connected to the oil storage chamber of the piston, the second return section is also connected to the oil storage bag, and the return flow is blocked a piece is movably disposed in the first return flow section; and

a backflow abutting surface located between the first backflow segment and the second backflow segment and facing the first backflow segment; and

The body component also has:

A backflow elastic member is disposed in the first backflow section and used to push the backflow blocking member against the backflow abutting surface, thereby blocking the first backflow section and the second backflow section.

In the aforementioned piston pump, the main body assembly further has an operating member, which is located in the second return flow section and selectively passes through the return flow abutting surface to push against the return flow blocking member, thereby The first reflux section and the second reflux section are communicated.

Description of drawings

FIG. 1 is a schematic side view of the clamping device of the present invention.

2 is a schematic cross-sectional view of the clamping device and the piston pump of the present invention.

3 is another schematic cross-sectional view of the clamping device and the piston pump of the present invention.

FIG. 4 is an enlarged cross-sectional view of the circulation part of the present invention.

5 is an enlarged cross-sectional view of the driving part and the driving assembly of the present invention.

6 is an enlarged cross-sectional view of the exhaust part and the drive assembly of the present invention.

7 is an enlarged cross-sectional view of the recirculation portion of the present invention.

8 is an enlarged cross-sectional view of the recirculation portion of the present invention after being pressed.

9 is another cross-sectional enlarged view of the recirculation portion of the present invention.

FIG. 10 is a schematic view of the operation of the circulation part of the present invention.

FIG. 11 is a schematic diagram of the operation of the driving part and the driving assembly of the present invention.

FIG. 12 is a schematic diagram of the operation of the circulation part of the present invention.

FIG. 13 is a schematic view of the operation of the exhaust part and the driving assembly of the present invention.

FIG. 14 is a schematic view of the operation of the circulation part of the present invention.

Detailed ways

First, please refer to FIG. 1 and FIG. 2 . The utility model proposes a piston pump 1 and a clamping device having the piston pump 1 . The clamping device also has an outer casing 2 , a first clamping member 3 , and a second clamping member 4 , and optionally has a restoring elastic member 5 . The piston pump 1 is fixed in the outer casing 2 .

Next, please refer to FIG. 2 and FIG. 3 . The piston pump 1 has an oil storage bag 10 , a main body assembly 20 , a driving assembly 30 , a power assembly 40 , and a piston 50 . The main assembly 20 has a circulation part 21 , a driving part 22 , and an exhaust part 23 , and also has a return part 24 in this embodiment.

Next, please refer to FIG. 3 and FIG. 4 . The circulation part 21 has a first main channel 211 , a first inlet blocking member 212 , and a first outlet blocking member 214 , and in this embodiment, it can also have a first abutting member 216 , a first branch flow A segment elastic member 213, and a first outlet segment elastic member 215, but not limited thereto. The circulation part 21 can also have a second main channel, a second inlet blocking member, a second outlet blocking member, a second abutting member, a second splitting section elastic member, and a second Outlet section elastic.

Specifically, the first main channel 211 has a first inlet section 2111 , a first branch section 2113 , and a first outlet section 2115 connected in sequence, and the first inlet section 2111 is further communicated with the oil storage bag 10 , and the first outlet section 2115 is further communicated with the piston 50 . In this embodiment, the diameter of the first inlet section 2111 is smaller than the diameter of the first branch section 2113, and the diameter of the first branch section 2113 is smaller than the diameter of the first outlet section 2115, so the first main channel 211 is further formed with two stages The surfaces are respectively a first split abutting surface 2112 and a first outlet abutting surface 2114 . The first split abutting surface 2112 is located between the first inlet section 2111 and the first split section 2113 and faces the first split section 2113, while the first outlet abutment surface 2114 is located between the first split section 2113 and the first outlet section 2115 between and facing the first outlet section 2115.

The first inlet blocking member 212 is movably disposed in the first splitting section 2113 , and the first outlet blocking member 214 is movably disposed in the first outlet section 2115 . The first abutting member 216 is fixed in the first outlet section 2115 but does not block the first outlet section 2115 . In accordance with this structure, the first splitting section elastic member 213 is disposed in the first splitting section 2113, and both ends of the first splitting section elastic member 213 abut against the first inlet blocking member 212 and the first outlet blocking member respectively 214 , and is used to push the first inlet blocking member 212 against the first split abutting surface 2112 , thereby blocking the first inlet section 2111 and the first split section 2113 . Similarly, the first outlet section elastic member 215 is disposed in the first outlet section 2115, and both ends of the first outlet section elastic member 215 abut against the first outlet blocking member 214 and the first abutting member 216 respectively, and use The first outlet blocking member 214 is pushed against the first outlet abutting surface 2114 , thereby blocking the first splitting section 2113 and the first outlet section 2115 .

Similarly, the second main channel has a second inlet section, a second branch section 2113', and a second outlet section which are communicated in sequence, and the second inlet section is further communicated with the oil storage bag 10, and the second The outlet section is further in communication with the piston 50 . In this embodiment, the diameter of the second inlet section is smaller than the diameter of the second splitting section 2113', and the diameter of the second splitting section 2113' is smaller than the diameter of the second outlet section, so the second main flow channel is further formed with two-level surfaces, They are respectively a second split abutting surface and a second outlet abutting surface. The second split abutting surface is located between the second inlet section and the second split section 2113' and faces the second split section 2113', while the second outlet abutment surface is located between the second split section 2113' and the second outlet section , and face the second exit segment.

The second inlet blocking member is movably disposed in the second diverter section 2113', and the second outlet blocking member is movably disposed in the second outlet section. The second abutting member is fixed in the second outlet section, but does not block the second outlet section. In accordance with this structure, the second splitting section elastic member is disposed in the second splitting section 2113', and both ends of the second splitting section elastic member abut against the second inlet blocking member and the second outlet blocking member respectively, and use The second inlet blocking member is pushed against the second branching abutting surface, thereby blocking the second inlet section and the second branching section 2113'. Similarly, the second outlet section elastic member is disposed in the second outlet section, and both ends of the second outlet section elastic member abut against the second outlet blocking member and the second abutting member respectively, and are used to push against the second outlet section elastic member. The outlet blocking member abuts against the second outlet abutting surface, thereby blocking the second splitting section 2113' and the second outlet section.

However, the structure of the circulation part 21 is not limited to the above disclosure. In other embodiments, the first main flow channel 211 or the second main flow channel can also be channels with the same diameter, but two rings at intervals are fixed therein. The body is used as a shunt abutting surface and an outlet abutting surface for the inlet blocking piece and the outlet blocking piece to abut against and block.

The driving part 22 has a first chamber 221 and a second chamber 222, and the first chamber 221 is communicated with the first splitting section 2113, and the second chamber 222 is communicated with the second splitting section 2113', and this embodiment The first chamber 221 is in communication with the second chamber 222 . In this embodiment, the width of the first chamber 221 is greater than the width of the second chamber 222 , so the driving portion 22 forms a first-order surface, which is the chamber abutting surface 223 . Therefore, the chamber abutting surface 223 is located between the first chamber 221 and the second chamber 222 and faces the first chamber 221 .

Next, please refer to FIG. 6 . The exhaust portion 23 has an exhaust passage 231 and an exhaust blocking member 232 , and in this embodiment, there is an exhaust elastic member 233 . Two ends of the exhaust passage 231 are respectively connected to the first chamber 221 and the oil storage bag 10 , and in this embodiment, the exhaust passage 231 has a first exhaust section 2311 and a second exhaust section 2312 which are communicated with each other. The first exhaust section 2311 is further communicated with the first chamber 221 , and the second exhaust section 2312 is further communicated with the oil storage bag 10 . The diameter of the first exhaust section 2311 may be smaller than the diameter of the second exhaust section 2312 , so the exhaust passage 231 forms an exhaust abutting surface 2313 . The exhaust abutting surface 2313 is located between the first exhaust section 2311 and the second exhaust section 2312 and faces the second exhaust section 2312 .

The exhaust blocking member 232 is movably disposed in the second exhaust section 2312 of the exhaust passage 231, and the exhaust elastic member 233 is also disposed in the second exhaust section 2312, and the exhaust elastic member 233 is used to push The exhaust blocking member 232 abuts against the exhaust abutting surface 2313 , thereby blocking the first exhaust section 2311 and the second exhaust section 2312 . In other words, the exhaust blocking member 232 selectively blocks the exhaust passage 231 .

The backflow portion 24 has a backflow channel 241 and a backflow blocking member 242 , and may have a backflow elastic member 243 in this embodiment. Two ends of the return passage 241 are respectively connected to the piston 50 and the oil storage bag 10 , and in this embodiment, the return passage 241 has a first return section 2411 and a second return section 2412 which are communicated with each other. The first return section 2411 is further communicated with the oil storage chamber 500 of the piston 50 , and the second return section 2412 is further communicated with the oil storage bag 10 . The diameter of the first backflow section 2411 may be larger than the diameter of the second backflow section 2412 , so the backflow channel 241 forms a backflow abutting surface 2413 . The backflow abutting surface 2413 is located between the first backflow section 2411 and the second backflow section 2412 and faces the first backflow section 2411

Next, please refer to FIG. 7 . The backflow blocking member 242 is movably disposed in the first backflow section 2411, and the backflow elastic member 243 is also disposed in the first backflow section 2411, and is used to push the backflow blocking member 242 against the backflow abutting surface 2413. Thus, the first recirculation section 2411 and the second recirculation section 2412 are selectively blocked. In other words, the backflow blocking member 242 selectively blocks the backflow channel 241 .

In this embodiment, the main body assembly 20 further has an operating member 244, which is located in the second return flow section 2412 and selectively passes through the return flow abutting surface 2413 and enters the first return flow section 2411, thereby pushing against the return flow resistance. The breaker 242 connects the first return section 2411 and the second return section 2412.

The driving assembly 30 has a driving column 31 , a stroke control ring 32 , a driving elastic member 33 , a connecting channel 34 , a connecting channel blocking member 35 , and an elastic pin 36 .

Next, please refer to FIG. 5 . The driving column 31 movably passes through the first chamber 221 and the second chamber 222, and has a first end and a second end opposite to each other. The second end of the driving column 31 is located in the second chamber 222 and seals the second chamber 222 . Specifically, the outer diameter of the second end of the driving column 31 is equal to the diameter of the second chamber 222 , and may have a sealing member to seal the hydraulic oil in the second chamber 222 . The stroke control ring 32 is fixed between the first end and the second end of the driving column 31 and located in the first chamber 221 , and the stroke control ring 32 seals the first chamber 221 . Specifically, the outer diameter of the stroke control ring 32 is equal to the diameter of the first chamber 221 . Therefore, the driving part 22 also has a sealing member 224, which is fixed on the inner wall surface of the first chamber 221 and abuts against the outer ring wall surface of the stroke control ring 32, thereby preventing the hydraulic oil from passing through the stroke control ring 32 and the outer ring wall. between the first chambers 221 .

In this embodiment, the stroke control ring 32 has a plane portion 321 and a cover portion 322 . The plane portion 321 is an annular plate body and is sleeved on the driving column 31 . The cover portion 322 is in the shape of a hollow cylinder and surrounds the driving column 31 , and one end is fixed on the outer edge of the plane portion 321 . The outer diameters of the plane portion 321 and the cover portion 322 are equal to the diameter of the first chamber 221 , so the sealing ring member 224 can abut against the outer wall surface of the cover portion 322 . In this embodiment, the cover portion 322 extends from the plane portion 321 to the second chamber 222 , thereby surrounding the driving column 31 . In other embodiments, the stroke control ring 32 only has the plane portion 321 without the cover portion 322 .

The driving elastic member 33 is sleeved on the driving column 31 , and both ends of the driving elastic member 33 abut on the chamber abutting surface 223 and the stroke control ring 32 respectively. In this embodiment, the driving elastic member 33 abuts against the plane portion 321 of the stroke control ring 32 and is surrounded by the cover portion 322 .

The communication channel 34 has a first communication section 341 and a second communication section 342 which are communicated with each other, and optionally has a radial communication section 343 . The first communication section 341 is communicated with the first chamber 221 through the radial communication section 343 , and the second communication section 342 is communicated with the second chamber 222 . In this embodiment, the first communication section 341 and the second communication section 342 both extend along the axial direction of the driving column 31 , and the radial communication section 343 extends along the radial direction of the driving column 31 . The diameter of the first communication section 341 may be smaller than that of the second communication section 342 , so the connecting channel 34 may have a connecting channel abutting surface 344 . The connecting channel abutting surface 344 is located between the first communication section 341 and the second communication section 342 and faces the second communication section 342 . The connecting channel blocking member 35 is movably disposed in the second communication section 342 and selectively abuts against the connecting channel abutting surface 344 , thereby blocking the first communication section 341 and the second communication section 342 .

The elastic pin 36 is fixed in the second communication section 342 and protrudes from the second end of the driving column 31 . In this embodiment, the elastic pin 36 is formed with a slit, which is parallel to the length direction of the second communication section 342 . The connecting channel blocking member 35 can be restricted in the second communication section 342 by the elastic pin 36 .

Next, please refer to FIG. 2 and FIG. 5 . The power assembly 40 is connected to the first end of the driving column 31 and used to drive the driving column 31 to move. In this embodiment, the power assembly 40 has a motor 41 and a cam 42 . The motor 41 drives the cam 42 to rotate, and the cam 42 abuts against the first end of the driving column 31 , thereby driving the driving column 31 to move when the cam 42 rotates. However, in other embodiments, a reciprocating sliding crank mechanism can also be used to drive the driving column 31 to move. Therefore, the power assembly 40 cooperates with the drive assembly 30 to control the advance of the piston 50 .

Next, please refer to FIG. 3 . The piston 50 is movably disposed on the main body assembly 20 and has an oil storage chamber 500 . The oil storage chamber 500 is communicated with the first inlet section 2111 and the second inlet section. The first clamping member 3 is fixed on the piston 50 , so the position of the first clamping member 3 is controlled by the piston 50 . The second clamping member 4 is fixed on the main body assembly 20 of the piston pump 1 , so the size of the clamping distance between the first clamping member 3 and the second clamping member 4 is controlled by the piston pump 1 . In this embodiment, the restoring elastic member 5 is connected to the first clamping member 3 and pushes against the first clamping member 3 in the direction of increasing the size of the clamping distance. However, in other embodiments, the restoring elastic member 5 may not be provided, but the clamping distance may be opened in other ways.

Next, please refer to FIG. 7 and FIG. 8 . In this embodiment, the clamping device may further have a pressing mechanism 6 , which is disposed on the portion of the outer casing 2 for the user to hold, and is connected to the operating member 244 of the return portion 24 . Therefore, when the user exerts force on the pressing mechanism 6 , the operating member 244 can push against the backflow blocking member 242 and open the backflow channel 241 .

Next, please refer to FIG. 2 , FIG. 4 , FIG. 5 , and FIG. 9 . Through the above structure, when the motor 41 drives the cam 42 to rotate, the driving column 31 will move up and down repeatedly. When the driving column 31 moves downward, the space between the first chamber 221 and the second chamber 222 increases, so that a vacuum state is formed in the connected first splitting section 2113 and the second splitting section 2113', thus the first inlet The blocking member 212 is separated from the first split abutting surface 2112, and the second inlet blocking member is separated from the second split abutting surface, but the first outlet blocking member 214 is pressed against the first outlet abutting surface 2114, and The second outlet blocking member abuts against the second outlet abutting surface. In other words, at this time, the first inlet section 2111 is communicated with the first split section 2113, and the second inlet section is communicated with the second split section 2113', but the first split section 2113 and the first outlet section 2115 are blocked, and The second splitting section 2113 ′ and the second outlet section are blocked, so that the oil in the oil storage bag 10 can only flow into the first chamber 221 and the second chamber 222 . On the other hand, when the driving column 31 moves downward, the pressure of the first chamber 221 is similar to the pressure of the second chamber 222 , so the oil will not pass through the connecting passage 34 between the first chamber 221 and the second chamber 221 . 222 flows between.

Next, please refer to FIG. 1 , FIG. 10 , FIG. 11 , and FIG. 12 . Next, when the driving column 31 moves upward, the space between the first chamber 221 and the second chamber 222 is reduced, so a high pressure state is formed in the connected first branch section 2113 and the second branch section 2113 ′, thus the first The inlet block 212 abuts against the first split abutting surface 2112 and the second inlet block abuts against the second split abutment, but the first outlet block 214 is separated from the first outlet abutment 2114 and The second outlet block is separated from the second outlet abutment surface. In other words, at this time, the first inlet section 2111 and the first split section 2113 are blocked, and the second inlet section and the second split section 2113' are blocked, but the first split section 2113 is communicated with the first outlet section 2115, And the second branching section 2113 ′ is communicated with the second outlet section, so that the oil in the first chamber 221 and the second chamber 222 can only flow into the oil storage chamber 500 of the piston 50 . When the oil flows into the oil storage chamber 500, it can push the piston 50 to move forward, thereby reducing the clamping distance between the first clamping member 3 and the second clamping member 4, so as to achieve the function of clamping objects.

At the same time, the pressure in the first chamber 221 is not enough to resist the exhaust elastic member 233, so the exhaust blocking member 232 remains in the state of blocking the exhaust passage 231, and the oil in the first chamber 221 can only flow in The oil storage chamber 500 of the piston 50 . Since the oil in the first chamber 221 and the second chamber 222 both flow into the oil storage chamber 500 of the piston 50 , the piston 50 can move at a higher speed and quickly hold the object.

Next, please refer to FIG. 1 , FIG. 6 , FIG. 13 , and FIG. 14 . When the first clamping member 3 and the second clamping member 4 jointly clamp the article, a reaction force will be generated on the first clamping member 3, causing the oil pressure in the oil storage chamber 500 to increase. The pressure in the first chamber 221 and the second chamber 222 will increase accordingly to continue to push the piston 50 . However, when the pressure in the first chamber 221 rises enough to oppose the exhaust elastic member 233, the exhaust blocking member 232 is pushed away, so that the first communication section 341 is communicated with the second communication section 342, at this time When the driving column 31 moves upward, the oil in the first chamber 221 will flow back to the oil storage bag 10 instead of flowing into the oil storage chamber 500 of the piston 50 . At the same time, the thrust of the cam 42 acting on the driving column 31 can be concentrated on the second end of the driving column 31, so that the pressure in the second chamber 222 can be further increased, and the piston 50 can be continuously pushed to clamp the article.

At this time, if the oil contained air in the previous flow process, and the oil containing air flows into the second chamber 222, the pressure increase in the second chamber 222 will only cause the air to be compressed. Therefore, the reduction of the space in the second chamber 222 will not drive the oil to flow out of the second chamber 222 and cause the piston 50 to move forward. However, in the present invention, as the driving column 31 continues to move up and down repeatedly, when the driving column 31 moves upward again, the oil containing air in the first chamber 221 can flow back into the oil storage bag 10 through the exhaust passage 231 . Therefore, the present invention can avoid the situation that the air cannot be pushed in the second chamber 222 due to the accumulation of the air in the second chamber 222 .

When the user wants to release the held item, he can press and apply force to the pressing mechanism 6, the operating member 244 can push against the backflow blocking member 242 and open the backflow passage 241, so the high-pressure piston 50 stores oil The oil in the cavity 500 will flow back into the oil storage bag 10 through the return passage 241 . In this embodiment, the reset elastic member 5 is used to push the first clamping member 3 away from the second clamping member 4 . At the same time, when the driving part 22 drives the oil into the oil storage chamber 500 of the piston 50 , the air will inevitably enter the oil storage chamber 500 along with the oil passing through the circulation part 21 . Therefore, when the user operates the pressing mechanism 6 to return the oil, the air in the oil storage chamber 500 can also be discharged back into the oil storage bag 10 at the same time.

Claims (13)

1. A piston pump, comprising:

an oil storage bag;

a body assembly having:

a first main flow passage having a first inlet section, a first branch section, and a first outlet section sequentially communicating with each other; the first inlet section is also communicated with the oil storage bag;

a first inlet blocking member movably disposed in the first main flow passage and selectively blocking the first inlet section and the first branch section;

a first outlet blocking member movably disposed in the first main flow passage and selectively blocking the first flow dividing section and the first outlet section;

a second main flow passage, which is provided with a second inlet section, a second branch section and a second outlet section which are communicated in sequence; the second inlet section is also communicated with the oil storage bag;

a second inlet blocking member movably disposed within the second flow section and selectively blocking the second inlet section and the second flow section;

a second outlet blocking member movably disposed within the second outlet section and selectively blocking the second flow splitting section and the second outlet section;

a first chamber in communication with the first flow-splitting section;

a second chamber in communication with the second flow-splitting section; the caliber of the second chamber is smaller than that of the first chamber;

an exhaust channel, two ends of which are respectively communicated with the first chamber and the oil storage bag;

an exhaust blocking member that selectively blocks the exhaust passage;

a drive assembly having:

the driving column is movably arranged in the first cavity and the second cavity in a penetrating way and is provided with a first end and a second end which are opposite; the second end of the drive column is positioned in the second chamber and seals the second chamber;

a stroke control ring fixedly arranged on the driving column and positioned in the first chamber; the stroke control ring sealing the first chamber;

a channel, both ends of which are respectively communicated with the first chamber and the second chamber;

a channel blocking member that selectively blocks the communication channel;

the power assembly is connected to the first end of the driving column and is used for driving the driving column to move; and

a piston movably disposed in the body assembly and having:

an oil storage cavity which is communicated with the first outlet section and the second outlet section.

2. The piston pump as in claim 1, in which:

the first main flow passage further has:

a first flow dividing abutment surface located between the first inlet section and the first flow dividing section and facing the first flow dividing section; and

a first outlet abutment surface located between the first flow-dividing section and the first outlet section and facing the first outlet section;

the second main flow passage further has:

a second flow dividing abutment surface located between the second inlet section and the second flow dividing section and facing the second flow dividing section; and

a second outlet abutment surface located between the second flow-dividing section and the second outlet section and facing the second outlet section; and is

The main body assembly further has:

a first branch section elastic element arranged in the first branch section and used for pushing the first inlet blocking element to abut against the first branch abutting surface, thereby blocking the first inlet section and the first branch section;

a first outlet section elastic member disposed in the first outlet section for pushing the first outlet blocking member to abut against the first outlet abutting surface, thereby blocking the first flow dividing section and the first outlet section;

a second flow-dividing section elastic member disposed in the second flow-dividing section and used for pushing the second inlet blocking member to abut against the second flow-dividing abutting surface, thereby blocking the second inlet section and the second flow-dividing section; and

and the second outlet section elastic piece is arranged in the second outlet section and is used for pushing the second outlet blocking piece to abut against the second outlet abutting surface, so that the second flow dividing section and the second outlet section are blocked.

3. The piston pump as in claim 2, in which:

the main body assembly further has:

the first abutting piece is fixedly arranged in the first outlet section, and two ends of the elastic piece of the first outlet section abut against the first abutting piece and the first outlet blocking piece respectively; and

the second abutting piece is fixedly arranged in the second outlet section, and two ends of the elastic piece of the second outlet section abut against the second abutting piece and the second outlet blocking piece respectively;

the two ends of the first branch section elastic piece are respectively abutted against the first inlet blocking piece and the first outlet blocking piece; and is

The two ends of the second branch section elastic piece are respectively abutted against the second inlet blocking piece and the second outlet blocking piece.

4. A piston pump according to any of claims 1 to 3, wherein:

the main body assembly further has:

a chamber abutting surface which is positioned between the first chamber and the second chamber and faces the first chamber;

the drive assembly further has:

the driving elastic piece is sleeved on the driving column, and two ends of the driving elastic piece are respectively abutted against the chamber abutting surface and the stroke control ring; and is

The power assembly has:

a cam abutting against the first end of the drive post, whereby the cam when rotated drives the drive post to move.

5. A piston pump according to any of claims 1 to 3, wherein:

the communicating passage has:

a first communicating section and a second communicating section which are communicated with each other; the first communicating section is communicated with the first chamber, and the second communicating section is communicated with the second chamber;

a channel abutting surface which is positioned between the first communicating section and the second communicating section and faces the second communicating section; and is

The connecting channel blocking piece is movably arranged on the second connecting section and selectively abuts against the connecting channel abutting surface, so that the first connecting section and the second connecting section are blocked.

6. The piston pump as in claim 5, in which:

the first communicating section and the second communicating section extend along the axial direction of the driving column; and is

The communication passage further has:

a radial communicating section extends along the radial direction of the driving column, and the first communicating section is communicated with the first chamber through the radial communicating section.

7. The piston pump as in claim 5, in which said drive assembly further comprises a resilient pin secured within said second communicating section and projecting from said second end of said drive post.

8. A piston pump according to any of claims 1 to 3, wherein the stroke control ring has:

a plane part which is an annular plate body and is sleeved on the driving column; and

a cover body part which is in a hollow column shape and surrounds the driving column, and one end of the cover body part is fixedly arranged on the outer edge of the plane part.

9. A piston pump according to any of claims 1 to 3, wherein:

the exhaust passage has:

a first exhaust section and a second exhaust section which are communicated with each other; the first exhaust section is also communicated with the first cavity, the second exhaust section is also communicated with the oil storage bag, and the exhaust blocking piece is movably arranged on the second exhaust section; and

the exhaust abutting surface is positioned between the first exhaust section and the second exhaust section and faces the second exhaust section; and is

The main body assembly further has:

and the exhaust elastic piece is arranged in the second exhaust section and used for pushing the exhaust blocking piece to abut against the exhaust abutting surface, so that the first exhaust section and the second exhaust section are blocked.

10. A piston pump according to any of claims 1 to 3, wherein the body assembly further comprises:

a return passage, both ends of which are respectively communicated with the oil storage cavity and the oil storage bag of the piston; and

a backflow preventer that selectively blocks the backflow passage.

11. The piston pump as in claim 10, in which:

the return passage has:

a first reflux section and a second reflux section which are communicated with each other; the first backflow section is also communicated with the oil storage cavity of the piston, the second backflow section is also communicated with the oil storage bag, and the backflow blocking piece is movably arranged on the first backflow section; and

the backflow abutting surface is positioned between the first backflow segment and the second backflow segment and faces the first backflow segment; and is

The main body assembly further has:

and the backflow elastic piece is arranged in the first backflow section and used for pushing the backflow blocking piece to abut against the backflow abutting surface, so that the first backflow section and the second backflow section are blocked.

12. The piston pump as in claim 11, in which the body assembly further comprises an operating member located within the second return section and selectively urged against the return-flow blocking member through the return-flow abutment surface, thereby communicating the first return section with the second return section.

13. A clamping device, comprising:

an outer casing;

a piston pump according to any one of claims 1 to 12, secured within the outer housing;

the first clamping piece is fixedly arranged on the piston of the piston pump; and

the second clamping piece is fixedly arranged on the outer shell; the first clamping piece and the second clamping piece form a clamping interval, and the size of the clamping interval is controlled by the position of the piston pump.

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