CN108953283A - A kind of synchronous hydraulic oil cylinder - Google Patents

Abstract

The present invention relates to hydraulic cylinder technical fields, disclose a kind of synchronous hydraulic oil cylinder, including outer cylinder body, outer cylinder body bottom is provided with the first hydraulic fluid port, first piston is fixedly connected in first cylinder barrel, the first cavity is formed between first cylinder barrel and outer cylinder body, second piston is slidably connected in first cylinder barrel, the first driving chamber is formed between first piston and second piston, it is provided with intercommunicating pore on first cylinder barrel, fuel feed hole is provided on first piston, check valve is installed in fuel feed hole, the second hydraulic fluid port is provided in second piston, the second hydraulic fluid port is connected to the first driving chamber；It is hit to solve to exist in the prior art ectonexine piston component, entire multistage hydraulic cylinder generates vibration, so that the problem that multistage hydraulic cylinder stability is still poor, this programme passes through the setting of check valve, the first cavity and the first driving chamber, so that the pressure of hydraulic oil reduces step by step, the first cylinder barrel and second piston movement velocity can be made to be consistent substantially, ensure that the stability of synchronous hydraulic oil cylinder.

Description

A synchronous hydraulic cylinder

technical field

The invention relates to the technical field of hydraulic cylinders, in particular to a synchronous hydraulic oil cylinder.

Background technique

The multi-stage telescopic hydraulic cylinder is composed of multiple pistons or plungers. The primary rod chamber and the secondary rod chamber are directly connected. When the hydraulic cylinder is extended, the piston rod with a larger cross-section drives the corresponding piston to the Piston rods with smaller cross-sections drive the corresponding pistons to extend sequentially; when the input flow remains constant, the extension speed of the hydraulic cylinder and the pressure in the hydraulic cylinder change step by step, and their values are inversely proportional to the piston area. After the rod moves to the limit, the hydraulic oil pushes the secondary piston rod to move. Due to the sudden increase in speed and pressure, the secondary piston rod will move at a faster speed than the primary piston rod in an instant, and the secondary piston rod will instantly move from the primary piston rod. The phenomenon that the stage rod cavity rushes out will cause the problem of large vibration in the whole multi-stage telescopic hydraulic cylinder, and the stability is poor.

In order to solve the above problems, the utility model patent with the Chinese patent application No. 201620580555.2 discloses a multi-stage hydraulic cylinder, which includes at least two cylinders that slide and nest sequentially from the inside to the outside. Piston assembly, each cylinder body includes a bottom cover and a cylinder barrel, rod cavities are respectively formed between the cylinder barrels of adjacent cylinder blocks and between the cylinder barrels of the innermost cylinder block and the piston assembly, and the adjacent cylinder blocks Rodless chambers are formed between the bottom covers of the body and between the bottom cover of the innermost cylinder block and the piston assembly. A first oil pump, a first channel and a second channel are arranged in the multi-stage hydraulic cylinder. The first oil pump passes through The first passage communicates with each rod chamber, and the first oil pump communicates with each rodless chamber through the second passage. The first oil pump and the oil delivery channel are arranged inside the multi-stage hydraulic cylinder, and the rod chambers and rodless chambers of the multi-stage hydraulic cylinder are respectively connected with the first oil pump, and the forward and reverse rotations of the oil pump are respectively controlled to the oil pump. The rod chamber and the rodless chamber input oil to drive the operation of the multi-stage hydraulic cylinder.

The above solution supplies oil to each rod cavity through the oil pump, which reduces the force of the inner piston assembly hitting the outer piston assembly, thereby improving the stability of the multi-stage hydraulic cylinder telescopic and solving the problems in the prior art, but the above The scheme also has the following problems. When the oil pump is rotating forward, the oil pump supplies oil to each rod chamber together. Because the oil pressure in each rod chamber is equal, the inner piston assembly moves faster than the outer piston assembly, and the inner piston When the component moves to the limit, it will hit the outer piston component, causing the entire multi-stage hydraulic cylinder to vibrate, and the stability of the multi-stage hydraulic cylinder is still poor.

Contents of the invention

The present invention intends to provide a synchronous hydraulic oil cylinder that can lift each piston assembly together and keep the lifting speed basically consistent, avoiding the collision of the inner piston assembly with the outer assembly, and ensuring the stability of the multi-stage hydraulic cylinder.

A synchronous hydraulic oil cylinder in this solution includes an outer cylinder body, a first oil port is opened at the bottom of the outer cylinder body, a first cylinder barrel is slidably connected to the outer cylinder body, and a first piston is fixedly connected to the inside of the first cylinder barrel. A first cavity is formed between the first cylinder and the outer cylinder, a second piston is slidably connected in the first cylinder, a first drive chamber is formed between the first piston and the second piston, and the first cylinder is There is a communication hole, the communication hole is used to connect the first cavity and the first driving cavity, the first piston has an oil inlet hole, a check valve is installed in the oil inlet hole, and the second piston has a second oil port , the second oil port communicates with the first drive chamber.

The technical principles and beneficial effects of this scheme are as follows:

1. Through the setting of the one-way valve, when the first oil port is filled with oil, the oil inlet hole, the first drive chamber, the communication hole and the first chamber can be filled through the one-way valve, and continue to pass through the first oil port. When filling the mouth, the oil will press the first piston to drive the first cylinder to move upward, and the first cylinder will squeeze the oil in the first cavity into the first drive cavity and into the first drive cavity On the one hand, the oil will react against the one-way valve, because the common cross-sectional area A1 after the connection between the first cylinder and the first piston is equal to the cross-sectional area A2 of the first chamber, the first driving chamber and part of the first cylinder , so A1 will be larger than the cross-sectional area A3 of the first chamber and the first driving chamber, and under the same force, the pressure P1 acting on A1 will be smaller than the pressure P2 acting on A3, so that the one-way valve is closed , on the other hand, it will push the second piston upwards, so that the first cylinder and the second piston are lifted upward together.

2. In this scheme, the oil entering from the first oil port drives the first cylinder to move, and the first cylinder will perform work on the oil in the first cavity. Due to the loss of work, the oil will The force is greater than the force of the oil flowing from the communication hole into the first drive chamber on the second piston, the contact area between the first cylinder and the second piston and the oil gradually decreases, and the force also gradually decreases, so that the The movement speed of the first cylinder and the second piston is basically consistent, which will ensure that the first cylinder and the second piston move to the limit together, prevent the second piston from hitting the first cylinder, and ensure the stability of the synchronous hydraulic cylinder .

Further, the cross-sectional area of the first cavity is equal to the cross-sectional area of the first driving cavity. When the first cylinder moves upward, the reduced area of the first cavity is consistent with the increased area of the first drive chamber, thereby ensuring that the first cylinder moves at the same speed as the second piston.

Further, the first piston is clamped on the first cylinder. It is convenient to install the first piston into the first cylinder.

Further, a locating ring is fixedly connected to the first piston, and a card slot is opened on the first cylinder, and a card key is locked in the card slot, and the locating ring is offset against the card key. First place the first piston on the bottom of the first cylinder, then snap the key into the slot, then fix the positioning ring on the first piston, and make the key and the positioning ring tightly fixed, so that The first piston is fixed on the bottom of the first cylinder.

Further, a bolt is threadedly connected to the first piston, and the positioning ring is sleeved on the bolt. The positioning ring is fixed by bolts, which facilitates the installation and replacement of the positioning ring.

Further, sealing rings are installed between the first cylinder and the outer cylinder, and between the second piston and the first cylinder. The arrangement of the sealing ring prevents oil from leaking from between the first cylinder and the outer cylinder, and between the second piston and the first cylinder.

Further, an earring is fixedly connected to the top of the second piston. The setting of the earrings facilitates installation with pressing objects.

Description of drawings

Fig. 1 is a cross-sectional view of a synchronous hydraulic cylinder according to an embodiment of the present invention.

Detailed ways

The following is further described in detail through specific implementation methods:

The reference signs in the drawings of the specification include: outer cylinder base 1, outer cylinder 2, first cylinder 3, first piston 4, additional cylinder 5, additional piston 6, second piston 7, one-way valve 8. Communication hole 9, key 10, positioning ring 11, bolt 12, first oil port 13, second oil port 14, oil hole 15, earring 16.

An example of an embodiment is shown in Figure 1: a synchronous hydraulic cylinder, comprising an outer cylinder, the outer cylinder includes an outer cylinder 2 and an outer cylinder base 1, the outer cylinder base 1 is welded to the bottom of the outer cylinder 2, and the outer cylinder base 1 has a first oil port 13, and a first cylinder 3 is slidably connected to the outer cylinder, a first piston 4 is installed in the first cylinder 3, and a first piston 4 is formed between the first cylinder 3 and the outer cylinder. In the cavity, the first cylinder 3 is slidably connected with an additional cylinder 5, and an additional piston 6 is installed in the additional cylinder 5. Both the first cylinder 3 and the additional cylinder 5 are provided with card slots, and the card slots are clamped There is a card key 10, and the card key 10 is offset by a positioning ring 11. Both the first piston 4 and the additional piston 6 are threaded with bolts 12, and the positioning ring 11 is sleeved on the bolt 12. The additional cylinder 5 and the first cylinder 3 A second cavity is formed between them, an additional drive cavity is formed between the first piston 4 and the additional piston 6, the cross-sectional area of the first cavity is equal to the cross-sectional area of the additional drive cavity, and the additional cylinder 5 is slidingly connected There is a second piston, the second piston includes a second piston barrel 7, a plug is welded on the second piston barrel 7, a first drive chamber is formed between the additional piston 6 and the second piston, the first cylinder barrel 3 and the additional cylinder There are communication holes 9 on the barrel 5, the communication holes 9 on the first cylinder 3 are used to communicate with the first cavity and the additional driving cavity, and the communication holes 9 on the additional cylinder 5 are used to communicate with the second cavity and the second cavity. A drive chamber, the cross-sectional area of the second chamber is equal to the cross-sectional area of the first drive chamber, the first piston 4 and the additional piston 6 are provided with oil inlet holes, and a check valve 8 is installed in the oil inlet holes. The oil inlet direction of the check valve 8 in the first piston 4 is from the first oil port to the additional drive chamber, and the oil inlet direction of the check valve 8 in the additional piston 6 is from the additional drive chamber to the first drive chamber. There is an oil through hole 15, and a second oil port 14 is opened on the oil through hole 15, and the second oil port 14 communicates with the first drive chamber, and an earring 16 is integrally formed on the plug, and the first cylinder 3 and the outer cylinder 2, between the additional cylinder 5 and the first cylinder 3, and between the second piston 7 and the additional cylinder 5, sealing rings are installed.

Fill oil first through the first oil port 13, so that all the spaces in the outer cylinder 2 such as the first cavity, the second cavity, the additional drive cavity, the first drive cavity and the second piston barrel 7 are filled with oil. When the synchronous hydraulic cylinder needs to be lifted outward, continue to fill oil through the first oil port 13, the oil will push the first piston 4 and the first cylinder 3 to move upward, and the first cylinder 3 will push the oil in the first cavity The fluid enters into the additional drive chamber through the communication hole 9 on the first cylinder 3, and the oil will react against the check valve 8 in the first piston 4 on the one hand, and the check valve 8 in the first piston 4 will be closed. On the other hand, the oil will push the additional piston 6 and the additional cylinder 5 to slide upwards. Since the cross-sectional area of the first cavity is equal to that of the additional drive cavity, the reduced volume of the first cavity will be equal to the increase of the additional drive cavity. volume, so as to ensure that the first cylinder 3 and the additional cylinder 5 slide up to the same height; when the additional cylinder 5 is lifted upwards, the additional cylinder 5 also squeezes the oil in the second cavity into the first drive cavity Inside, on the one hand, the oil will react against the check valve 8 in the additional cylinder 5, and the check valve 8 in the additional cylinder 5 will be closed; on the other hand, the oil will push the first piston 4 and the earring 16 to slide upwards, Because the cross-sectional area of the second chamber is equal to the cross-sectional area of the first driving chamber, the reduced volume of the second chamber will be equal to the increased volume of the first driving chamber, thereby ensuring that the additional cylinder barrel 5 and the first piston 4 operate in the same manner. The speed slides upwards, so that the first cylinder 3, the additional cylinder 5 and the first piston 4 are all lifted upwards at the same speed. When the first cylinder 3 moves to the limit position, the first cylinder 3, the additional cylinder Tube 5 and first piston 4 will also stop moving together, and can prevent first cylinder tube 3, additional cylinder tube 5 and first piston 4 from colliding with each other, will promote the stability of whole synchronous hydraulic cylinder; 3. After the additional cylinder 5 and the first piston 4 stop moving, the hydraulic oil injected from the first port will flow out from the second oil port 14 through the two check valves 8 and the oil through hole 15, and the oil injection will stop.

When it is necessary to reset the synchronous hydraulic cylinder, fill oil into the second oil port 14, the oil will enter the second piston barrel 7 through the oil inlet hole, and the oil in the first drive chamber will pass through the additional cylinder 5 The connecting hole 9 of the connecting hole 9 is pressed into the second cavity, the second piston barrel 7 will move downward, and the oil will also push the additional cylinder barrel 5 to slide downward, and the additional cylinder barrel 5 drives the additional piston 6 to push the additional drive chamber. When the oil enters the first cavity, the oil will push the first cylinder 3 to drive the first piston 4 to slide downward, and the first cylinder 3 and the first piston 4 will push the outer cylinder base 1 and the first piston 4 The oil in between flows out from the first oil port 13, and after the complete reset, stop the oil injection.

What is described above is only an embodiment of the present invention, and common knowledge such as specific structures and characteristics known in the scheme are not described here too much. It should be pointed out that for those skilled in the art, under the premise of not departing from the structure of the present invention, several modifications and improvements can also be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation of the present invention. Effects and utility of patents. The scope of protection required by this application shall be based on the content of the claims, and the specific implementation methods and other records in the specification may be used to interpret the content of the claims.

Claims (7)

1. a kind of synchronous hydraulic oil cylinder, including outer cylinder body, outer cylinder body bottom is provided with the first hydraulic fluid port, and is slidably connected in outer cylinder body One cylinder barrel is fixedly connected with first piston in the first cylinder barrel, the first cavity, the first cylinder is formed between the first cylinder barrel and outer cylinder body Second piston is slidably connected in cylinder, the first driving chamber is formed between first piston and second piston, which is characterized in that first Intercommunicating pore is provided on cylinder barrel, intercommunicating pore is provided with fuel feed hole, oil inlet on first piston for being connected to the first cavity and the first driving chamber It is equipped in hole from the first hydraulic fluid port to the check valve of the first driving chamber oil inlet, is provided with the second hydraulic fluid port, the second hydraulic fluid port in second piston It is connected to the first driving chamber.

2. synchronous hydraulic oil cylinder according to claim 1, it is characterised in that: the cross-sectional area of first cavity and The cross-sectional area of one driving chamber is equal.

3. synchronous hydraulic oil cylinder according to claim 1, it is characterised in that: the first piston is connected to the first cylinder barrel On.

4. synchronous hydraulic oil cylinder according to claim 3, it is characterised in that: be fixedly connected with positioning on the first piston It encloses, is provided with card slot on the first cylinder barrel, card key is connected in card slot, locating ring offsets with card key.

5. synchronous hydraulic oil cylinder according to claim 4, it is characterised in that: be threaded with spiral shell on the first piston Bolt, locating ring are socketed on bolt.

6. synchronous hydraulic oil cylinder according to claim 1, it is characterised in that: between first cylinder barrel and outer cylinder body, Sealing ring is mounted between two pistons and the first cylinder barrel.

7. synchronous hydraulic oil cylinder according to claim 1, it is characterised in that: be fixedly connected with ear at the top of the second piston Ring.