CN215657540U

CN215657540U - Steel bar bender

Info

Publication number: CN215657540U
Application number: CN202121464130.2U
Authority: CN
Inventors: 陈维修
Original assignee: Wenzhou Ouxiang Machinery Co ltd
Current assignee: Wenzhou Ouxiang Machinery Co ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2022-01-28
Anticipated expiration: 2031-06-29

Abstract

The utility model discloses a steel bar bender, and relates to the technical field of steel bar bending. The utility model comprises a fixed bending head, a movable bending head moving relative to the fixed bending head, a hydraulic cylinder with a piston rod fixedly connected with the movable bending head, a plunger pump communicated with the hydraulic cylinder through an oil path and providing power for the plunger pump, and further comprises an overpressure protection structure, wherein the overpressure protection structure comprises a first passage for communicating an oil inlet cavity of the hydraulic cylinder with an oil storage cavity of the plunger pump and a pressure valve for opening and closing the first passage, the pressure valve is closed when the pressure of the oil inlet cavity is less than or equal to a preset pressure, and the pressure valve is opened when the pressure of the oil inlet cavity is greater than the preset pressure, so that the overpressure protection structure can work within a certain pressure range, and can effectively avoid the damage of components due to too large oil pressure.

Description

Steel bar bender

Technical Field

The utility model relates to the technical field of steel bar bending, in particular to a steel bar bending machine.

Background

A steel bar bender is a tool for bending steel bars. Including fixed bending head, activity bending head, pneumatic cylinder, plunger pump, motor drive plunger pump promotes the pneumatic cylinder action, and the pneumatic cylinder drives the motion of the relatively fixed bending head of activity bending head, and the reinforcing bar presss from both sides between fixed bending head and activity bending head, when the motion of activity bending head near fixed bending head, bends the reinforcing bar. However, when the existing steel bar bender works, the situation that parts are damaged due to too large oil pressure sometimes occurs.

Therefore, how to manufacture a steel bar bender, which can operate within a certain pressure range, and can effectively avoid the damage of components due to too large oil pressure is a problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a steel bar bender which can work in a certain pressure range and can effectively avoid the damage of components due to too large oil pressure.

In order to solve the technical problems, the utility model is realized by the following technical scheme:

the utility model provides a steel bar bender, which comprises a fixed bending head, a movable bending head moving relative to the fixed bending head, a hydraulic cylinder with a piston rod fixedly connected with the movable bending head, a plunger pump communicated with the hydraulic cylinder through an oil way, and a motor for providing power for the plunger pump, and further comprises an overpressure protection structure, wherein the overpressure protection structure comprises a first passage for communicating an oil inlet cavity of the hydraulic cylinder with an oil storage cavity of the plunger pump, and a pressure valve for opening and closing the first passage, the pressure valve is closed when the pressure of the oil inlet cavity is less than or equal to a preset pressure, and the pressure valve is opened when the pressure of the oil inlet cavity is greater than the preset pressure.

Optionally, the pressure valve includes a pressure valve port communicated with the first passage, a first plug is disposed on a side of the pressure valve port away from the oil inlet chamber, and the first plug is connected to a first elastic member for driving the first plug to move so as to attach to and detach from the pressure valve port.

Optionally, the pressure valve includes a first oil return member fixedly connected to the bottom wall of the oil inlet cavity and provided with a cylindrical cavity, a first through hole is formed in the bottom wall of the oil inlet cavity, a pressure valve port communicated with the first through hole is formed in the first bottom wall of the cavity adjacent to the first through hole, a through hole communicated with the oil storage cavity is formed in the side wall of the cavity, the first plug is slidably disposed in the cavity, a first elastic member in a compressed state is disposed between the first plug and a second bottom wall of the cavity away from the first through hole, and the first through hole and the cavity form the first passage.

Optionally, the first oil return piece comprises a first pipe fitting with a threaded hole at one end and a second plug screwed on the threaded hole, and an inner bottom wall of the second plug forms a second bottom wall of the cavity.

Optionally, the oil outlet cavity of the hydraulic cylinder is provided with a third plug, the third plug is fixedly connected with the part, close to the oil inlet cavity, of the piston, the rod part of the third plug is located on the oil outlet cavity of the hydraulic cylinder, and the second plug is fixedly connected with the oil outlet cavity of the hydraulic cylinder.

Optionally, an air bag is fixedly arranged at the rear end of the oil storage cavity, and a third elastic piece used for assisting the rebound of the air bag is arranged in the air bag.

Optionally, the plunger pump includes along circumference evenly distributed, along the drive shaft of the pump oil subassembly of radial setting and being provided with the eccentric spindle nose, the fixed cup joint of eccentric spindle nose have with the bearing that the tip of the push rod of pump oil subassembly contacted, the oil storage chamber is still fixed to be provided with the clearance cup joint and is in the anti-bubble pipe fitting of the periphery of bearing.

Optionally, a first handle and a second handle are respectively arranged at the end part of the rear end of the steel bar bender and on the side wall of the front end of the steel bar bender, and a switch button is arranged at the first handle.

The technical scheme provided by the utility model can have the following beneficial effects: the utility model comprises a fixed bending head, a movable bending head moving relative to the fixed bending head, a hydraulic cylinder with a piston rod fixedly connected with the movable bending head, a plunger pump communicated with the hydraulic cylinder through an oil path and providing power for the plunger pump, and further comprises an overpressure protection structure, wherein the overpressure protection structure comprises a first passage for communicating an oil inlet cavity of the hydraulic cylinder with an oil storage cavity of the plunger pump and a pressure valve for opening and closing the first passage, the pressure valve is closed when the pressure of the oil inlet cavity is less than or equal to a preset pressure, and the pressure valve is opened when the pressure of the oil inlet cavity is greater than the preset pressure, so that the overpressure protection structure can work within a certain pressure range, and can effectively avoid the damage of components due to too large oil pressure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a perspective view of a bar bender shown in the first embodiment;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is a schematic diagram of an overvoltage protection structure;

FIG. 4 is a schematic view of a limit guard configuration;

FIG. 5 is a schematic view of an air bag and an anti-bubble tube.

In the figure: 1. fixing the bending head; 2. a movable bending head; 3. a hydraulic cylinder; 4. a plunger pump; 5. a motor; 6. an oil inlet cavity; 7. an oil storage chamber; 8. a cavity; 9. a first through hole; 10. a first pipe member; 11. Second plugging; 12. a first elastic member; 13. first plugging; 14. a piston; 15. a guide hole; 16. An oil return hole; 17. third plugging; 18. an oil outlet cavity; 19. a second elastic member; 20. a piston rod; 21. an air bag; 22. a third elastic member; 23. a first fixing member; 24. a second fixing member; 25. a plunger assembly; 26. a drive shaft; 27. a bearing; 28. an anti-bubble tube; 29. a first handle; 30. a second handle; 31. a switch button; 32. a hydraulic cylinder block; 33. a second valve; 34. a fourth elastic member; 35. A plunger pump cylinder; 36. the pressure valve port.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus or methods consistent with certain aspects of the utility model.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

Hereinafter, embodiments will be described with reference to the drawings. The embodiments described below do not limit the scope of the utility model described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the utility model described in the claims.

Referring to fig. 1-5, the utility model provides a steel bar bender, which comprises a fixed bending head 1, a movable bending head 2, a hydraulic cylinder 3, a plunger pump 4 and a motor 5, wherein the hydraulic cylinder 3 comprises a piston 14, the piston 14 is connected with a piston rod 20, the piston 14 divides an inner cavity of the hydraulic cylinder 3 into an oil inlet cavity 6 and an oil outlet cavity 18, a driving shaft 26 and a plunger assembly 25 are arranged in the oil storage cavity 7 of the plunger pump 4, the oil storage cavity 7 and the oil inlet cavity 6 are provided with an oil inlet pipeline (the oil inlet pipeline is only conducted when pumping oil) and a reset pipeline, the reset pipeline is provided with a second valve 33, the oil outlet cavity 18 and the oil storage cavity 7 are provided with a first oil return pipeline, and the oil outlet cavity 18 is provided with a fourth elastic part 34. The piston rod 20 is fixedly connected with the movable bending head 2. The motor 5 drives the driving shaft 26 to rotate, the driving shaft 26 pushes the plunger assembly 25 of the plunger pump 4 to move and pump oil to the oil inlet cavity 6 of the hydraulic cylinder 3 through the oil inlet pipeline, the piston 14 is pushed to move forwards (the fixed bending head 1 is the front end), meanwhile, oil in the oil outlet cavity 18 returns to the oil storage cavity 7 through the first oil return pipeline, the piston rod 20 drives the movable bending head 2 to move towards the fixed bending head 1, the reinforcing steel bar is placed between the fixed bending head 1 and the movable bending head 2, and the reinforcing steel bar is bent into a required shape. After the steel bar is bent and formed, the motor 5 is closed, the second valve 33 is opened, the oil inlet cavity 6 and the oil storage cavity 7 are communicated through the reset pipeline, the oil pressure borne by the piston 14 disappears, the piston moves in the direction away from the fixed bending head 1 under the action of the fourth elastic piece 34, and when the movable bending head 2 moves to a required position, the second valve 33 is closed. The fourth elastic member 34 may be provided as a spring. And bending the next reinforcing steel bar. Each oil circuit is provided with a common sealing structure to prevent oil leakage. The present invention is further provided with an overpressure protection structure, and referring to fig. 3, the overpressure protection structure includes a first passage and a pressure valve, the first passage communicates the oil storage chamber 7 with the oil inlet chamber 6, the pressure valve is closed when the pressure of the oil inlet chamber 6 is less than or equal to a predetermined pressure, and the pressure valve is opened when the pressure of the oil inlet chamber 6 is greater than the predetermined pressure. So, can guarantee that angle bending machine is less than or equal to predetermined pressure's within range work, when the pressure of oil feed chamber 6 is greater than predetermined pressure, the pressure valve is opened, and oil feed chamber 6 and oil storage chamber 7 switch on through first passageway, even plunger subassembly 25 is through the oil inlet pipe to oil feed chamber 6 pump oil, the fluid of oil feed chamber 6 will directly get back to oil storage chamber 7 through first passageway, can not produce pressure to piston 14. When the pressure of the oil inlet cavity 6 is less than or equal to the preset pressure, the pressure valve is closed, and the steel bar bender can continue to work normally. Therefore, the condition that the oil pressure is too large can be prevented, and the workpiece is damaged.

The pressure valve comprises a pressure valve port 36, a first plug 13 is arranged on one side, away from the oil inlet cavity 6, of the pressure valve port 36, the first plug 13 is connected with a first elastic part 12, and the first elastic part 12 is used for driving the first plug 13 to move so as to be attached to and detached from the pressure valve port 36. When the pressure in the oil inlet chamber 6 is less than or equal to the elastic force of the first elastic member 12, the first plug 13 overcomes the oil pressure joint pressure valve port 36 to close the first passage under the elastic force of the first elastic member 12. When the pressure in the oil inlet chamber 6 is greater than the elastic force of the first elastic element 12, the oil pressure pushes the first plug 13 to disengage from the pressure valve port 36 against the elastic force of the first elastic element 12, and the first passage is opened.

Referring to fig. 3, the pressure valve includes a first oil return member, the first oil return member is fixedly connected to the bottom wall of the oil inlet cavity 6, the first oil return member is provided with a cylindrical cavity 8, the bottom wall of the oil inlet cavity 6 is provided with a first through hole 9, a pressure valve port 36 communicated with the first through hole 9 is arranged on the first bottom wall of the cavity 8 close to the first through hole 9, a through hole communicated with the oil storage cavity 7 is arranged on the side wall, a first plug 13 is slidably arranged in the cavity, a first elastic member 12 is arranged between the first plug 13 and the second bottom wall of the cavity 8 far away from the first through hole 9, the first elastic member 12 is in a compressed state, and the first through hole 9 and the cavity 8 form a first passage. The first plug 13 moves to the pressure valve port under the elastic force of the first elastic member 12 and is attached to the pressure valve port to close the pressure valve port. When the pressure of the oil inlet cavity 6 is larger than the elastic force of the first elastic element 12, the first plug 13 is pushed to move rightwards to separate from the pressure valve port, and the pressure valve port is opened. The elastic force of the first elastic element 12 is the predetermined pressure when the first plug 13 is engaged with the pressure valve port.

Furthermore, the first oil return piece comprises a first pipe fitting 10 and a second plug 11, the first pipe fitting 10 is provided with a cavity 8, the right end of the first pipe fitting is provided with a threaded hole, the threaded hole is communicated with the cavity 8, the second plug 11 is in threaded connection with the threaded hole, and the first elastic piece 12 is arranged between the first plug 13 and the second plug 11 in a compression mode. In this way, the second plug 11 can be moved to the left and back by the knob to adjust the initial compression length of the first elastic member 12, so as to fine-tune the initial elastic force to the desired predetermined pressure.

Wherein the left end of the first pipe member 10 may be provided with external threads and screwed on the bottom wall of the oil feed chamber 6. The pressure valve port can be arranged in a spherical crown shape, and the joint part of the first seal 13 and the pressure valve port is also arranged in a spherical crown shape. The first elastic member 12 may be provided as a spring.

As shown in fig. 4, the steel bar bender further includes a limiting protection structure, the limiting protection structure includes a guide hole 15, an oil return hole 16, a third plug 17 and a second elastic member 19, the guide hole 15 and the oil return hole 16 penetrate through the piston 14, the third plug 17 includes a rod portion and an end portion, the rod portion penetrates through the guide hole 15 and is slidably connected with the rod portion, the end portion is located on the right side of the piston 14, and the second elastic member 19 is fixedly connected to the left end of the rod portion. When the piston 14 moves to the left, because the force-bearing area of the left side of the third plug 17 is smaller than the force-bearing area of the right side, the lower end of the third plug 17 is attached to the right side surface of the piston 14 under the action of oil pressure, the oil return hole 16 is closed, and the piston 14 can move to the left under the action of oil pressure. When the piston 14 moves to the limit position, that is, the movable bending head 2 moves to the position close to the fixed bending head 1, the second elastic member 19 abuts against the left bottom wall of the oil outlet cavity 18, when the elastic force generated by the compression of the second elastic member 19 is greater than the resultant force of left and right oil pressures applied to the third plug 17, the third plug 17 moves rightwards, the oil return hole 16 is communicated, and at this time, oil in the oil inlet cavity 6 directly enters the oil outlet cavity 18 through the oil return hole 16, and no pressure is generated on the piston 14 to continuously push the piston 14 to continuously move leftwards, so that the workpiece is damaged.

As shown in fig. 5, an airbag 21 is fixedly disposed at the rear end of the oil reservoir 7, a third elastic member 22 is disposed in the airbag 21, and the third elastic member 22 is used to assist the rebound of the airbag 21. The air bag 21 functions as a pressure relief. The third elastic member 22 is provided in the airbag 21 to assist the rebound of the airbag 21. Without the third elastic member 22, the airbag 21 is elastically deformed by itself, and the deformation recovery effect is poor, and sometimes the airbag cannot be recovered. Specifically, a first fixing member 23 and a second fixing member 24 are respectively clamped at two ends of the airbag 21, a third elastic member 22 is arranged between the first fixing member 23 and the second fixing member 24, and the third elastic member 22 can be a spring.

The plunger pump 4 comprises an oil pumping assembly 25, a driving shaft 26, wherein the driving shaft 26 is provided with an eccentric shaft head, a bearing 27 is arranged on the eccentric shaft head, the periphery of the bearing 27 is in contact with the end part of a push rod of the oil pumping assembly 25, and when the driving shaft 26 rotates, the push rod of the oil pumping assembly 25 is pushed to move back and forth along the radial direction to pump oil to the oil inlet cavity 6. An anti-bubble pipe 28 is fixedly arranged in the oil storage cavity 7, the anti-bubble pipe 28 is sleeved on the periphery of the bearing 27 and is provided with a gap with the periphery of the bearing 27, and a through hole for the oil pumping assembly 25 to pass through is formed in the side wall of the anti-bubble pipe 28. When the driving shaft 26 rotates at a high speed with the driving bearing 27, a large amount of air bubbles are generated by stirring the oil, and thus the oil pumped into the oil inlet chamber 6 contains a large amount of air bubbles, which affects the transmission efficiency. Adding an anti-bubble pipe 28, firstly, bubbles generated by the stirring of the bearing 27 are thrown to the inner wall of the anti-bubble pipe 28 and are broken and disappear through collision; secondly, due to the blockage of the anti-bubble pipe fitting 28, the oil generating bubbles is blocked by the anti-bubble pipe fitting, and is not easy to be pressed into the oil inlet cavity 6 by the oil pumping assembly 25 through an oil inlet pipeline; again, the bearings 27 agitate a smaller volume of oil with less effect due to the inclusion of the anti-bubble tube 28.

A first handle 29 and a second handle 30 are respectively arranged at the end part of the rear end and the side wall of the front end of the steel bar bender, and a switch button 31 is arranged at the first handle 29. Therefore, the steel bar bending machine is convenient for workers to hold the steel bar bending machine by two hands to bend steel bars. When the worker presses the switch button 31, the motor 5 operates and the movable bending head 2 moves toward the fixed bending head 1.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations to the above embodiments, which are within the scope of the present invention, may be made by those of ordinary skill in the art.

Claims

1. A steel bar bender comprises a fixed bending head (1), a movable bending head (2) moving relative to the fixed bending head (1), a hydraulic cylinder (3) fixedly connected with a piston rod (20) and the movable bending head (2), a plunger pump (4) communicated with the hydraulic cylinder (3) through an oil path, a motor (5) for providing power for the plunger pump (4), characterized in that the device also comprises an overpressure protection structure, the overpressure protection structure comprises a first passage for communicating an oil inlet cavity (6) of the hydraulic cylinder (3) with an oil storage cavity (7) of the plunger pump (4) and a pressure valve for opening and closing the first passage, the pressure valve is closed when the pressure of the oil inlet chamber (6) is less than or equal to a predetermined pressure, the pressure valve is opened when the pressure of the oil inlet chamber (6) is greater than the predetermined pressure.

2. A steel bar bender according to claim 1, characterized in that the pressure valve comprises a pressure valve port (36) communicated with the first channel, a first plug (13) is arranged on the side of the pressure valve port (36) far from the oil inlet chamber (6), and a first elastic member (12) for driving the first plug (13) to move to fit and separate from the pressure valve port is connected to the first plug (13).

3. A machine as claimed in claim 2, characterised in that said pressure valve comprises a first oil return element, fixedly connected to the bottom wall of said oil intake chamber (6), provided with a cylindrical cavity (8), a first through hole (9) is arranged on the bottom wall of the oil inlet cavity (6), a pressure valve port (36) communicated with the first through hole (9) is arranged on the first bottom wall of the cavity (8) adjacent to the first through hole (9), a through hole communicated with the oil storage cavity (7) is arranged on the side wall, the first plug (13) is arranged in the cavity (8) in a sliding manner, the first elastic piece (12) in a compressed state is arranged between the first plug (13) and the second bottom wall of the cavity (8) far away from the first through hole (9), the first through hole (9) and the cavity (8) form the first passage.

4. A machine as claimed in claim 3, characterized in that said first return element comprises a first tube (10) provided at one end with a threaded hole and a second plug (11) screwed onto said threaded hole, the inner bottom wall of said second plug (11) forming the second bottom wall of said cavity (8).

5. The steel bar bender according to claim 1, further comprising a limiting protection structure, wherein the limiting protection structure comprises a piston (14) axially penetrating through the hydraulic cylinder (3), a guide hole (15) and an oil return hole (16), a rod part is slidably disposed in the guide hole (15), an end part of the rod part is used for being attached to a bottom surface, close to the oil inlet cavity (6), of the piston (14) to seal the oil return hole (16) and a third plug (17), and a second elastic part (19) is fixedly connected to a part, located in an oil outlet cavity (18) of the hydraulic cylinder (3), of the rod part of the third plug (17).

6. A steel bar bender according to claim 1, characterized in that the rear end of the oil storage chamber (7) is fixedly provided with an air bag (21), and a third elastic member (22) for assisting the rebound of the air bag (21) is arranged in the air bag (21).

7. The angle bending machine according to claim 1, characterized in that the plunger pump (4) comprises an oil pumping assembly (25) which is uniformly distributed along the circumferential direction and arranged along the radial direction, and a driving shaft (26) provided with an eccentric shaft head, the eccentric shaft head is fixedly sleeved with a bearing (27) which is in contact with the end part of a push rod of the oil pumping assembly (25), and the oil storage chamber (7) is further fixedly provided with an anti-bubble pipe fitting (28) which is sleeved with a gap on the periphery of the bearing (27).

8. The angle bending machine according to claim 1, wherein a first handle (29) and a second handle (30) are provided at the end of the rear end and the side wall of the front end of the angle bending machine, respectively, and a switch knob (31) is provided at the first handle (29).