Bending machine oil cylinder with multidirectional oil supply structure

Abstract

The utility model belongs to the technical field of bending machine oil cylinders, and discloses a bending machine oil cylinder with a multidirectional oil supply structure, which comprises an oil cylinder body, a piston in sliding connection with the oil cylinder body, a cooling shell connected with the oil cylinder body, a limiting block connected with the cooling shell, a limiting groove formed in the limiting block, a spring connected with the top wall of the limiting groove, and a push plate connected with the spring. The piston is connected with a fixing plate, the fixing plate is connected with a connecting rod, the connecting rod is connected with a sliding block, the sliding block and the push plate are slidably connected with the limiting groove, the oil cylinder body is connected with an oil inlet pipe, and the oil inlet pipe is connected with a switching device. By arranging the spring, the push plate and other structures, the speed of the piston during return stroke can be reduced, and the situation that the oil cylinder body is greatly impacted due to the fact that the return stroke speed of the piston is too high is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of bending machine oil cylinders, in particular to a bending machine oil cylinder with a multi-directional oil supply structure. Background Art

[0002] Press brakes are primarily used to bend sheet metal, and hydraulic systems play an important role in this process. Switchable oil supply cylinders allow you to switch the oil supply direction under different operating conditions, thereby controlling the movement and position of the machine.

[0003] A search of Chinese utility models (publication number CN221097030U) discloses a press brake cylinder with switchable oil supply, including a cylinder body, a pipe assembly, a sealing mechanism, a spring, a sliding baffle, and other structures. The switch is achieved by rotating the screw to move the switch block, while the arc-shaped protrusion at the bottom of the switch block drives the sliding baffle to move via the arc-shaped groove, completing the switching process. The operation is very simple, effectively avoiding the danger of simultaneous exposure of the pipes, indirectly improving the stability of the cylinder during use, and this design greatly increases practicality.

[0004] However, it has been found in actual application that this technical solution still has at least the following defects:

[0005] This technical solution does not improve the piston in the oil cylinder. After the piston moves downward quickly, the return speed cannot be guaranteed or the return impact is relatively large. Excessive impact force will cause wear of the oil cylinder body, thereby increasing the probability of hydraulic system failure. Utility Model Content

[0006] The utility model is intended to provide a bending machine oil cylinder with a multi-directional oil supply structure to solve the problems raised in the above background technology.

[0007] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0008] A bending machine cylinder with a multi-directional oil supply structure includes a cylinder body, the cylinder body is slidably connected to a piston, the cylinder body is connected to a cooling shell, the cooling shell is connected to a limit block, the limit block has a limit slot, the top wall of the limit slot is connected to a spring, the spring is connected to a push plate, the piston is connected to a fixed plate, the fixed plate is connected to a connecting rod, the connecting rod is connected to a slider, the slider and the push plate are slidably connected to the limit slot, the cylinder body is connected to an oil inlet pipe, and the oil inlet pipe is connected to a switching device.

[0009] Preferably, the switching device includes a transfer box, which is connected to the oil inlet pipe, which is connected to the oil delivery pipe, which is rotatably connected to a threaded rod, which is threadedly connected to a switching block, and which cooperates with the oil inlet pipe.

[0010] Preferably, the threaded rod is connected to a handle.

[0011] Preferably, the cooling shell is connected to a water inlet pipe and a water outlet pipe, the cooling shell is connected to a plurality of baffles, the baffles are staggered, and the oil cylinder body is connected to the baffles.

[0012] Preferably, the oil cylinder body is detachably connected to an oil-absorbing sponge, and the oil-absorbing sponge is sleeved on the outside of the piston.

[0013] Compared with the existing technology, this technical solution has the following beneficial effects:

[0014] (1) This technical solution is able to slow down the speed of the piston during its return stroke by setting a slider, a fixed plate, a connecting rod and a spring, so as to avoid the piston returning too fast and causing a large impact on the cylinder body and causing damage to the cylinder body, thereby extending the service life of the cylinder body. It also ensures the stability of the piston during its return stroke, so that the various parts of the bending machine remain in a stable state, providing a guarantee for the next precise bending operation. By setting a push plate, the bending machine is prevented from being pulled by the spring during the downward bending operation, so that the piston is not hindered during the downward pressing process, and the hydraulic oil can push the piston to work more efficiently, reducing unnecessary energy loss, thereby improving the working efficiency of the bending machine.

[0015] (2) By setting a threaded rod and a switching block, the oil inlet pipe can be switched to avoid the cylinder being unable to be used when one oil inlet pipe is blocked. The other oil inlet pipe can be switched to supply oil, keeping the cylinder body working stably.

[0016] (3) By providing a handle, it is more convenient for the operator to rotate the threaded rod.

[0017] (4) By setting up a cooling shell, the cylinder body is prevented from generating heat during operation due to friction, hydraulic oil compression, etc., which causes the internal temperature of the cylinder to rise and the viscosity of the hydraulic oil to decrease. By cooling the cylinder body through the cooling shell, the hydraulic oil can be kept within a more suitable temperature range, ensuring its viscosity is stable, thereby ensuring that the cylinder body can output power stably under various working conditions and keeping the movement speed and thrust of the piston stable. By setting up a baffle, the cooling water must flow along a tortuous path in the cooling shell, extending the residence time and flow of the cooling water in the cooling shell. The cooling water is in contact with the cylinder body for a longer time and over a larger area, which increases the opportunities for heat transfer.

[0018] (5) By setting up an oil-absorbing sponge, the moving piston can be cleaned to ensure that the piston is clean and tidy, which is convenient for the daily operation of the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front cross-sectional view of the utility model;

[0020] Figure 2 This is a front cross-sectional view of the switching device provided by the utility model;

[0021] Figure numerals: cylinder body 1, piston 2, fixing plate 3, oil absorption sponge 4, water inlet pipe 5, connecting rod 6, slider 7, push plate 8, limit groove 9, limit block 10, spring 11, handle 12, threaded rod 13, oil pipeline 14, transfer box 15, water outlet pipe 16, oil inlet pipe 17, baffle 18, cooling shell 19, switching block 20. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0023] like Figure 1-2 The illustrated embodiment of a press brake cylinder with a multi-directional oil supply structure includes a cylinder body 1, a piston 2 slidably connected to the cylinder body 1, the free end of the piston 2 extending through the cylinder body 1, a cooling shell 19 surrounding the outer wall of the cylinder body 1, a water inlet pipe 5 connected to the bottom side wall of the cooling shell 19, a valve provided on the water inlet pipe 5, a water outlet pipe 16 connected to the top wall of the cooling shell 19, and a plurality of baffles 18 connected to the inner wall of the cooling shell 19. The baffles 18 are staggered and arranged, and the cylinder body 1 passes through and is connected to the baffles 18. Cooling water enters the cooling shell 19 through the water inlet pipe 5 and flows along a tortuous path formed by the staggered baffles 18, causing the cooling water to constantly change direction, thereby generating turbulence. According to the principles of heat transfer, the heat transfer coefficient of a fluid in a turbulent state is much higher than that in a laminar state, and the cooling water and the cylinder body 1 can fully contact each other for heat exchange. After the heat exchange is completed, the cooling water is discharged through the outlet pipe 16.

[0024] like Figure 1As shown, both sides of the cooling shell 19 are connected to limit blocks 10, which define limit slots 9. The top wall of the limit slots 9 is connected to a spring 11, and the other end of the spring 11 is connected to a push plate 8. The free end of the piston 2 extending from the oil cylinder body 1 is connected to a fixed plate 3, and connecting rods 6 are connected to both sides of the fixed plate 3. The other end of the connecting rod 6 is connected to a slider 7. Both the slider 7 and the push plate 8 are slidably connected to the limit slots 9. When the hydraulic oil pushes the piston 2 downward, the piston 2 drives the fixed plate 3 downward, causing the connecting rod 6 to move downward at the same time. The connecting rod 6 drives the slider 7 to slide downward in the limit slot 9 without affecting the downward pressure of the piston 2. When the piston 2 moves downward to the top, the slide is still in the limit slot 9. During the return stroke of piston 2, it drives fixed plate 3 upward, causing connecting rod 6 to push slider 7 upward within retaining groove 9. Slider 7 contacts push plate 8, pushing it upward. This compresses spring 11, which contracts under the force and cushions this energy through its elastic deformation. The resistance created by the contraction of spring 11 slows the sliding speed of slider 7, thereby slowing the return stroke of piston 2. An oil-absorbing sponge 4 is detachably attached to cylinder body 1 and fits over the outside of piston 2. As piston 2 moves up and down, the sponge 4 wipes back and forth, cleaning it.

[0025] like Figure 2 As shown, the cylinder body 1 is connected to two sets of oil inlet pipes 17, which are jointly connected to a switching device. The switching device includes a transfer box 15. The bottom wall of the transfer box 15 is connected to the two sets of oil inlet pipes 17, and the top wall of the transfer box 15 is connected to the oil delivery pipe 14. The inner wall of the transfer box 15 is rotatably connected to a threaded rod 13, one end of which extends outside the transfer box 15 and is connected to the handle 12. The threaded rod 13 within the transfer box 15 is threadedly connected to two sets of switching blocks 20. The switching blocks 20 are rectangular parallelepipeds, with their front and rear walls both contacting the inner wall of the transfer box 15. The switching blocks 20 cooperate with the oil inlet pipes 17. In the initial position, the left switching block 20 contacts and seals the left oil inlet pipe 17, while the right oil inlet pipe 17 intersects with the right switching block 20. Hydraulic oil enters the transfer box 15 through the oil delivery pipe 14 and then enters the cylinder body 1 through the right oil inlet pipe 17. By rotating the threaded rod 13 by the handle 12, the two groups of switching blocks 20 are displaced along the direction of the threaded rod 13. When the right switching block 20 contacts the right side wall of the transfer box 15, the right switching block 20 just seals the right oil inlet pipe 17, and the left switching block 20 just disengages from the left oil inlet pipe 17.

[0026] The specific implementation process is as follows:

[0027] When the cylinder is operating, the valve on the water inlet pipe 5 is opened, allowing cooling water to enter the cooling shell 19 for heat exchange. The oil delivery pipe 14 delivers hydraulic oil to the transfer box 15. The hydraulic oil then enters the cylinder body 1 through either oil inlet pipe 17. The hydraulic oil pushes the piston 2 downward, driving the fixed plate 3 and connecting rod 6 downward, pulling the slider 7 downward within the limit slot 9. During the return stroke of the piston 2, it drives the fixed plate 3 and connecting rod 6 upward, pushing the slider 7 upward within the limit slot 9. The slider 7 contacts the push plate 8, causing the compression spring 11 to contract. This spring 11 slows the sliding speed of the slider 7, thereby reducing the speed of the piston 2 during its return stroke.

[0028] When any oil inlet pipe 17 is blocked, the handle 12 is rotated to rotate the threaded rod 13, changing the position of the switching block 20 so that the blocked oil inlet pipe 17 is sealed and the other oil inlet pipe 17 is opened.

[0029] The above description is merely an embodiment of the present invention, and the commonly known specific technical solutions and / or features of the solution are not described in detail here. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be considered as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed in this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A bending machine cylinder with a multi-directional oil supply structure, characterized by: The invention comprises an oil cylinder body (1), wherein the oil cylinder body (1) is slidably connected to a piston (2), the oil cylinder body (1) is connected to a cooling shell (19), the cooling shell (19) is connected to a limiting block (10), the limiting block (10) is provided with a limiting groove (9), the top wall of the limiting groove (9) is connected to a spring (11), the spring (11) is connected to a push plate (8), the piston (2) is connected to a fixed plate (3), the fixed plate (3) is connected to a connecting rod (6), the connecting rod (6) is connected to a slider (7), the slider (7) and the push plate (8) are slidably connected to the limiting groove (9), the oil cylinder body (1) is connected to an oil inlet pipe (17), and the oil inlet pipe (17) is connected to a switching device.

2. The hydraulic cylinder for a bending machine with a multi-directional oil supply structure according to claim 1, characterized in that: The switching device comprises a transfer box (15), the transfer box (15) is connected to an oil inlet pipe (17), the transfer box (15) is connected to an oil delivery pipe (14), the transfer box (15) is rotatably connected to a threaded rod (13), the threaded rod (13) is threadedly connected to a switching block (20), and the switching block (20) cooperates with the oil inlet pipe (17).

3. The hydraulic cylinder for a bending machine with a multi-directional oil supply structure according to claim 2, characterized in that: The threaded rod (13) is connected to a handle (12).

4. The hydraulic cylinder for a bending machine with a multi-directional oil supply structure according to claim 1, characterized in that: The cooling shell (19) is connected to a water inlet pipe (5) and a water outlet pipe (16), the cooling shell (19) is connected to a plurality of baffles (18), the baffles (18) are arranged in a staggered manner, and the oil cylinder body (1) is connected to the baffles (18).

5. The hydraulic cylinder for a bending machine with a multi-directional oil supply structure according to claim 1, characterized in that: The oil cylinder body (1) is detachably connected to an oil-absorbing sponge (4), and the oil-absorbing sponge (4) is sleeved on the outside of the piston (2).

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