Refrigerator liner punching hydraulic machine

Abstract

This invention discloses a hydraulic press for punching holes in a refrigerator liner. The upper part of the machine body has an upper crossbeam, and a main cylinder is installed in the middle of the upper crossbeam. A slider is suspended from the lower end of the plunger of the main cylinder. The lower part of the machine body has a machine body worktable, and a movable worktable is covered on the machine body worktable. A linear guide rail extending in the front-to-back direction is embedded in a groove at the top of the machine body worktable, and a guide slide is installed on the linear guide rail. A movable platform support is installed on each side of the movable platform, and the bottom of the movable platform support rests on the guide slide. The movable platform is symmetrically machined with multiple sets of stepped through holes around its own axis. Multiple sets of disc springs are embedded in each stepped through hole. The bottom disc springs are supported on the movable platform support, and disc spring caps press against the top of the disc springs and are fixed in the large holes of the stepped through holes. This hydraulic press for punching holes in a refrigerator liner uses a flat movable worktable that automatically lifts, reducing the height of the movable worktable and the friction of movement, thus improving efficiency.

Description

Technical Field

[0001] This invention relates to a hydraulic press, and more particularly to a hydraulic press for punching holes in the inner liner of a refrigerator, belonging to the field of hydraulic machine tool technology. Background Technology

[0002] Currently, hydraulic press moving tables generally use a servo reducer to drive the rollers for movement. This structure is mainly used in moving tables of large and medium-sized hydraulic presses. The power mechanism of the moving table, the servo reducer, is installed inside the moving table. Due to the limitations of the servo reducer and the rollers' dimensions, the height of the moving table is generally relatively large, around 550mm to 750mm. This type of moving table requires a lifting and clamping hydraulic cylinder device and a hydraulic system to control the movement of the hydraulic cylinders. When the moving table needs to be moved out of the machine body to change molds, the rollers of the moving table must be lifted by the lifting hydraulic cylinder (or a lifting and clamping combined hydraulic cylinder). After the moving table moves back into the machine body, the pressure of the lifting hydraulic cylinder needs to be released, allowing the rollers at the four corners of the moving table to fall into their corresponding holes. At the same time, the clamping cylinders work to clamp the moving table, so that the lower surface of the moving table contacts the upper surface of the machine body's moving table, bearing the pressure of the main hydraulic cylinder and preventing deformation or damage to the rollers and roller bearings from the nominal force of the main slide block.

[0003] The above structure is the traditional method used in most hydraulic presses for moving worktables, but its shortcomings are:

[0004] 1. The overall height of the movable worktable is relatively large, and it is generally a box-shaped welded structure, which occupies a lot of the opening height of the hydraulic press, thus increasing the overall height of the press.

[0005] 2. A dedicated lifting and clamping hydraulic cylinder is required. The lifting and clamping auxiliary actions of the moving worktable take a long time, have low efficiency, are complex, pose a risk of oil leakage, and can easily contaminate the equipment and workpieces.

[0006] 3. The moving worktable has a low movement speed, generally in the range of 60-150 mm / s, which reduces the production cycle time.

[0007] In addition, some methods use hydraulic cylinders to push and pull or chains to drag the movement of the mobile worktable. These methods have many disadvantages, such as oil leakage and pollution, low environmental efficiency, and large installation space requirements.

[0008] Refrigerator liners are mostly made of engineering plastics such as ABS or PS sheets, and are a type of thin-shell component with relatively large dimensions widely used in home appliances. After being formed by injection molding, vacuum forming, or extrusion, the refrigerator liners need to be trimmed and punched with various shaped holes using molds. This punching process is generally completed on a hydraulic press. Due to the large size of the refrigerator liners, especially their height, combined with the height of the upper and lower molds, the stroke and opening height of the hydraulic press are required to be substantial. If loading and unloading are done inside the machine body, the stroke and opening height of the hydraulic press need to be significantly increased, resulting in a substantial increase in the overall height of the hydraulic press, and consequently, a corresponding increase in the height of the user's factory.

[0009] To overcome the above disadvantages, one effective method is to load and unload the hydraulic press from the outside of the machine body. That is, the movable worktable with the lower die is moved to the outside of the machine body, the loading robot moves the workpiece into the lower die, the movable worktable then moves the lower die and workpiece into the machine body, the main slide of the hydraulic press presses down with the upper die to punch, the slide releases pressure and returns, the movable worktable moves out of the machine body, the unloading robot takes out the punched parts and transports them out, and at the same time the loading robot puts the unpunched parts into the lower die, and this cycle is repeated.

[0010] The following issues need to be addressed:

[0011] 1. Lifting of the movable worktable: When the movable worktable moves, its lower surface needs to be out of contact with the hydraulic worktable surface in order to reduce the movement resistance of the contact surface;

[0012] 2. Repeatability of the Moving Worktable: Each time the moving worktable moves outside the machine body, it needs to stop at the same position. The robot's movement program is fixed, and the loading robot's placement position for handling unprocessed parts is also fixed each time. The workpiece needs to be accurately placed into the lower mold. Therefore, the stopping position of the moving worktable must be fixed at the same point each time, requiring high repeatability. The moving worktable, carrying the lower mold and workpiece, also requires high repeatability when moving into the machine body. Because the mold-closing points of the upper and lower molds must be accurately aligned before fixing them to the slider and moving worktable respectively, the moving worktable needs to stop at the same position each time. Otherwise, excessive deviation will damage the mold, and inaccurate stamping positions will result in scrap.

[0013] 3. Operational efficiency needs to be significantly improved: The movement speed of the moving worktable needs to be increased to 500-600 mm / s to save the cycle time of each pressing cycle and improve production efficiency. Summary of the Invention

[0014] The purpose of this invention is to overcome the problems existing in the prior art and provide a hydraulic press for punching holes in the inner liner of a refrigerator. It adopts a flat movable worktable that is automatically lifted, thereby reducing the height of the movable worktable and the friction of movement, and improving the effective opening height and efficiency of the hydraulic press.

[0015] To solve the above technical problems, the present invention provides a refrigerator liner punching hydraulic press, comprising a machine body, an upper crossbeam at the upper part of the machine body, a main cylinder installed in the middle of the upper crossbeam, a slider suspended at the lower end of the plunger of the main cylinder, a machine body worktable at the lower part of the machine body, a movable worktable covered on the machine body worktable, a linear guide rail extending in the front-back direction is embedded in the top groove of the machine body worktable, and a guide slide is installed on the linear guide rail; a moving platform support is installed on the lower sides of the movable worktable, and the bottom of the moving platform support is supported on the guide slide;

[0016] The movable worktable is symmetrically machined with multiple sets of stepped through holes around its own axis. Multiple sets of disc springs are embedded in each stepped through hole. The bottom disc spring is supported on the movable worktable support, and the disc spring cover is pressed on the top of the disc spring and fixed in the large hole of the stepped through hole.

[0017] Furthermore, each set of disc springs is respectively mounted on the central rod of the disc spring seat, with the bottom disc spring abutting against the lower large end of the disc spring seat. The lower large end of the disc spring seat is embedded in the countersunk hole on the shift support. A central hole for the disc spring seat is provided along the axis of the central rod of the disc spring seat. Screws are inserted into the central hole of the disc spring seat and screwed into the shift support to fix the disc spring seat.

[0018] Furthermore, the center hole of the disc spring seat is a stepped hole that is wider at the top and narrower at the bottom, and the upper end of the center hole of the disc spring seat is provided with an internal thread for lifting and moving the worktable.

[0019] Furthermore, a rack extending in the front-rear direction is installed on the outer bottom of the shift support. The two racks mesh with gears respectively. The two gears are fixed on the gear shafts respectively, and the tops of the gears protrude from the upper grooves of the corresponding rails. The gear shafts on both sides are connected to each other through universal joints. One gear shaft is connected to the output end of the shift servo reducer.

[0020] Furthermore, V-shaped irons with outward openings are respectively embedded in the middle of the two side walls of the movable worktable; locking device base plates are respectively fixed on the outer side of the track and the machine body worktable, and the upper surface of the locking device base plate is provided with a square recess, in which a locking cylinder support is embedded, and a locking cylinder is fixed on the outer side of the locking cylinder support. The free end of the piston rod of the locking cylinder is connected to the root of the locking cylinder pin, the circumference of the locking cylinder pin is located in the guide sleeve, the guide sleeve is fixed in the locking cylinder support, and the front and rear sides of the end of the locking cylinder pin are symmetrically provided with cutting surfaces to form a positive V-shaped head, which matches the positive V-shaped notch of the V-shaped iron.

[0021] Furthermore, the left and right sides of the locking cylinder support abut against the left and right edges of the square recess, and the front and rear sides of the locking cylinder support and the front and rear edges of the square recess are respectively provided with fixed wedges and floating wedges. The upper narrow and lower wide inclined surface of the fixed wedge and the upper wide and lower narrow inclined surface of the floating wedge are in contact with each other, and the screws are screwed into the square recess of the locking device base plate from top to bottom.

[0022] Furthermore, a guide key is fixed on the locking cylinder pin, and the guide key is embedded in the long groove of the guide sleeve.

[0023] Furthermore, a sensing block is fixed on the locking cylinder pin, and a sensing block clearance groove extending axially is provided on the guide sleeve; a square recessed groove is machined on the front or rear side of the locking cylinder support, and a proximity switch mounting plate is fixed in the square recessed groove; a pin-locking proximity switch and a pin-unlocking proximity switch are respectively installed in the central long groove of the proximity switch mounting plate.

[0024] Furthermore, the servo reducer drives the moving worktable to translate at a speed of 500-600 mm / s. The moving position of the moving worktable is calculated by the number of rotations of the servo reducer, the reduction ratio of the reducer, and the pitch circle radius of the gear. The reducer decelerates in advance at the stopping position. The deviation of the stopping position is automatically aligned by the positive V-shaped head of the locking cylinder pin being inserted into the positive V-shaped notch of the V-shaped iron on the side of the moving worktable.

[0025] Furthermore, a lower mold is fixed on the movable worktable, and the lower mold is provided with multiple lower mold process cylinders for punching holes in the four walls of the refrigerator inner liner. A movable worktable pipeline rear support extending upward is fixed on one rear side of the movable worktable, and a lower mold distribution block extending outward is fixed on the front end of the movable worktable.

[0026] Multiple rigid pipes are connected along the height direction of the rear support of the moving platform pipeline. The front end of each rigid pipe is bent and connected to the upper surface interface of the lower mold distribution block. The lower mold oil circuit valve block and the lower mold pneumatic solenoid valve, which are matched with each lower mold process cylinder, are fixed on one side of the moving worktable. The oil outlet connectors of the lower mold oil circuit valve block are directly connected to the lower mold hydraulic hose. The interfaces of the lower mold pneumatic solenoid valve are connected to the lower mold pneumatic hose. The other end of each lower mold hydraulic hose and the lower mold pneumatic hose are respectively connected to the front side interface of the lower mold distribution block.

[0027] The front side of the lower mold distribution block is fixed with an upper bracket of the moving platform cable chain. Directly below the upper bracket of the moving platform cable chain is a lower bracket of the moving platform cable chain extending horizontally backward. The rear end of the lower bracket of the moving platform cable chain is fixed to the lower front end of the column. The two ends of the moving worktable cable chain are connected between the upper bracket of the moving platform cable chain and the lower bracket of the moving platform cable chain. The hydraulic hoses and pneumatic hoses of each lower mold are neatly arranged in the moving worktable cable chain.

[0028] Furthermore, the front end of the movable worktable is fixed with an upwardly extending movable stage pipeline front bracket, which is located behind the lower mold distribution block, and the front ends of each rigid pipe are respectively fixed to the movable stage pipeline front bracket by pipe clamps.

[0029] Furthermore, an upper mold is fixed below the slider. The upper mold is equipped with multiple upper mold process cylinders for punching holes in the bottom wall of the refrigerator liner. The upper mold oil circuit valve block and the upper mold pneumatic solenoid valve that control the upper mold process cylinders are fixed on the upper crossbeam. A machine body support is fixed on the upper rear side of the machine body. An upper mold distribution block is fixed at the rear end of the machine body support. The interfaces of the upper mold oil circuit valve block and the upper mold pneumatic solenoid valve are respectively connected to the upper interface of the upper mold distribution block through rigid pipes.

[0030] The upper mold oil port bracket and the slider bracket are fixed on the rear side of the slider and move up and down with the slider. The interface of each upper mold process cylinder is fixed on the upper mold oil port bracket. The upper mold distribution block two is fixed on the slider bracket. The interface of each upper mold process cylinder is connected to the upper interface of the upper mold distribution block two through a rigid pipe.

[0031] The body support and the slider support are connected by a slider drag chain system. The slider drag chain system is equipped with upper mold hydraulic hose and upper mold pneumatic hose. Each lower interface of upper mold distribution block one is connected to the corresponding lower interface of upper mold distribution block two through upper mold hydraulic hose or upper mold pneumatic hose.

[0032] Furthermore, in the hydraulic system, the pressure oil circuit is connected to the inlet of cartridge valve C1 and cartridge valve C2, the outlet of cartridge valve C1 is connected to the upper chamber oil port of the main cylinder 4, the outlet of cartridge valve C2 is connected to the inlet of cartridge valve C3, and the outlet of cartridge valve C3 is connected to the lower chamber oil port of the main cylinder 4.

[0033] The pressure oil circuit is connected to the P port of the three-position four-way solenoid directional valves one and two, the T port of the three-position four-way solenoid directional valves one and two is connected to the oil tank, the A port of the three-position four-way solenoid directional valves one and two is connected to the plug chamber oil port of each locking cylinder 28, and the B port of the three-position four-way solenoid directional valves one and two is connected to the rod chamber oil port of each locking cylinder 28.

[0034] The pressure oil circuit is connected to the P port of the three-position four-way solenoid valves three and four. The T port of the three-position four-way solenoid valves three and four is connected to the oil tank. The A port of the three-position four-way solenoid valves three and four is connected to the plug cavity oil port of each lower mold process cylinder 47. The B port of the three-position four-way solenoid valves three and four is connected to the rod cavity oil port of each lower mold process cylinder 47.

[0035] The pressure oil circuit is connected to the P port of the three-position four-way solenoid directional valve five. The T port of the three-position four-way solenoid directional valve five is connected to the oil tank. The A port of the three-position four-way solenoid directional valve five is connected to the plug chamber oil port of each upper mold process cylinder 48. The B port of the three-position four-way solenoid directional valve five is connected to the rod chamber oil port of each upper mold process cylinder 48. The neutral position function of the three-position four-way solenoid directional valve five is Y type. The neutral position functions of the three-position four-way solenoid directional valves one to five are all Y type.

[0036] Compared with existing technologies, this invention achieves the following beneficial effects: 1. It innovatively designs a flat-panel mobile worktable, which can be made from a single piece of medium-thick steel plate, reducing its height. It also innovatively designs an automatic disc spring lifting device, which can automatically lift the mobile worktable along with the mold. This ejection structure replaces structures such as lifting hydraulic cylinders and rollers, reducing the height of the mobile worktable.

[0037] 2. Simultaneously, linear guides are used as the motion guides for the moving worktable, reducing motion friction and lowering the height of the moving worktable, thereby increasing the effective opening height of the hydraulic press. A high-power servo reducer is used to drive the movement of the moving worktable, increasing its moving speed to 500-600 mm / s. Due to the new structure of the moving worktable, auxiliary actions such as lifting, lowering, clamping, and positioning of conventional moving worktables are reduced, and the high movement speed further improves the overall working efficiency of the hydraulic press.

[0038] 3. The mobile worktable is easy to lift and the disc spring can be replaced without flipping the worktable. After removing the pressure cover, the disc spring seat and the disc spring can be pulled out directly upwards, making replacement quick and convenient, and avoiding the disc spring falling off during the flipping of the worktable.

[0039] 4. Place the hydraulic system valve block on the movable workbench and set up a bracket. Lead the oil and air circuit interfaces of the upper and lower mold process cylinders to the slider and workbench respectively. No matter how many process cylinder interfaces are needed, only two pipelines, namely the oil inlet pipe and the oil return pipe, need to be led down from the upper beam pump station. This greatly simplifies the number of pipelines, facilitates arrangement and layout, saves space, and reduces the risk of joints and oil leakage.

[0040] 5. The inlet and outlet ports of the process cylinder hydraulic system can be directly connected to hoses, reducing intermediate nodes. Only a small section of hose moves with the slider or moving worktable, improving reliability.

[0041] 6. The hydraulic system valve block for controlling the moving platform process cylinder is placed at the bottom of the machine body for easy maintenance, repair, and adjustment of working pressure.

[0042] 7. Due to the obstruction of space such as the moving platform rails at the front of the machine body, it is inconvenient for users to operate; this structure leads the oil and air lines of the process cylinders on the moving worktable to the rear of the machine body through brackets, etc., to facilitate connection and operation.

[0043] 8. The hydraulic hoses and pneumatic hoses of the process cylinder are arranged in an orderly manner inside the cable chain. Considering the balance of weight, the heavier and thicker hydraulic hoses are arranged in pairs on the two outer sides of the cable chain, while the lighter and thinner pneumatic hoses are arranged in the middle of the cable chain. In this way, the weight of the hoses on the cable chain is balanced, which improves the service life of the cable chain.

[0044] 9. The linear guide rail enables precise positioning of the moving worktable in the left and right directions, allowing for rapid alignment in the front and back directions after the worktable moves in and out. It is unaffected by the vertical movement of the worktable and has extremely high repeatability. Attached Figure Description

[0045] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The drawings are provided for reference and illustration only and are not intended to limit the present invention.

[0046] Figure 1 The three-dimensional hydraulic press for punching holes in the refrigerator liner of the present invention Figure 1 ;

[0047] Figure 2 The three-dimensional hydraulic press for punching holes in the refrigerator liner of the present invention Figure 2 ;

[0048] Figure 3 This is a left view of the hydraulic press for punching holes in the refrigerator liner of the present invention;

[0049] Figure 4 This is a rear view of the hydraulic press for punching holes in the refrigerator liner according to the present invention.

[0050] Figure 5 for Figure 1 Enlarged view of the mobile workbench section;

[0051] Figure 6 This is a top view of the centering and locking device of the moving platform in this invention;

[0052] Figure 7 This is a sectional view of the vertical longitudinal section of the moving platform locking device in this invention;

[0053] Figure 8 This is a cross-sectional view of the moving platform locking device in this invention along a horizontal cross section.

[0054] Figure 9 This is an end view of the moving platform locking device in this invention;

[0055] Figure 10 This is a cross-sectional view of the lifting mechanism of the mobile platform in this invention;

[0056] Figure 11 This is a perspective view of the translation drive mechanism of the mobile platform in this invention;

[0057] Figure 12 This is a schematic diagram of the hydraulic system in this invention;

[0058] In the diagram: 1. Upper crossbeam; 2. Column; 2a. Lower connecting beam of the column; 2b. Machine body support; 2c. Conveyor belt mounting window; 3. Slider; 4. Main cylinder; 5. Moving worktable; 5a. V-block; 5b. Moving table support; 5c. Rack; 5d. Moving worktable discharge hole; 6. Machine body worktable; 6a. Machine body discharge hole; 6b. Proximity switch mounting plate; 6c. Rear stop component; 7. Upper die distribution block one; 8. Slider drag chain system; 9. Upper die distribution block two; 10. Slider support; 11. Upper die oil port support; 12. Oil inlet main pipe; 13. Oil return main pipe; 14. Oil distribution block; 15. Lower die oil circuit valve block; 16. Lower die pneumatic solenoid valve; 17. Lower bracket of moving table drag chain; 18. Moving worktable drag chain; 19. Upper bracket of moving table drag chain; 20. Lower die distribution block; 21. Moving... 21. Front support for the moving platform piping; 22. Rear support for the moving platform piping; 23. Compression fitting; 24. Rigid pipe; 25. Rail; 25a. Front stop block; 26. Locking device base plate; 27. Locking cylinder support; 28. Locking cylinder; 28a. Locking cylinder piston rod; 28b. Plug cavity oil port; 28c. Rod cavity oil port; 29. ​​Locking cylinder pin; 30. Guide key; 31. Guide sleeve; 32. Sensing block; 33. Pin unlocking proximity switch; 34. Pin locking proximity switch; 35. Fixed wedge; 36. Floating wedge; 37. Lubricating oil cup; 38. Linear guide rail; 39. Guide slide; 40. Square tube support; 41. Disc spring seat; 42. Disc spring; 43. Disc spring cover; 44. Moving platform servo reducer; 45. Universal joint; 46. Gear; 47. Lower mold process cylinder; 48. Upper mold process cylinder. Detailed Implementation

[0059] In the following description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not mean that the device must have a specific orientation.

[0060] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0062] like Figures 1 to 5As shown, the refrigerator liner punching hydraulic press of the present invention includes an upper pump station, a machine body with an integral frame structure, a slider, a movable worktable, a shifting table centering and locking device, a shifting table process cylinder oil and air circuit, a slider drag chain system, and a movable worktable drag chain system. The machine body includes four columns 2, the upper ends of the left and right columns 2 are connected by an upper crossbeam 1, the upper pump station is installed on the top of the upper crossbeam 1, a main cylinder 4 is provided in the middle of the upper crossbeam 1, the lower end of the plunger of the main cylinder 4 is connected to the top center of the slider 3, a machine body worktable 6 is provided at the lower part of the machine body, and a movable worktable 5 is provided above the machine body worktable 6.

[0063] The left and right sides of the bottom of the movable worktable 5 are supported on the linear guide rail 38, the front of the linear guide rail 38 is supported on the rail 25, and the rear of the linear guide rail 38 is embedded in the groove on the upper surface of the machine body worktable 6.

[0064] The bottom of the slider 3 is equipped with an upper mold, which contains multiple upper mold process cylinders. The upper mold oil circuit valve block, upper mold air source, and upper mold pneumatic solenoid valve that control the upper mold process cylinders are fixed on the upper crossbeam 1. A body support 2b extending rearward is fixed to the upper rear facade of a certain column 2. The rear end of the body support 2b is fixed with an upper mold distribution block 7. The interfaces of the upper mold oil circuit valve block and the upper mold pneumatic solenoid valve are connected to the upper interface of the upper mold distribution block 7 through rigid pipes.

[0065] The upper mold oil port bracket 11 and the slider bracket 10 are fixed on the rear side of the slider 3 and move up and down with the slider 3. The interface of each upper mold process cylinder is fixed on the upper mold oil port bracket 11. The upper mold distribution block 2 9 is fixed on the slider bracket 10. The interface of each upper mold process cylinder is connected to the upper interface of the upper mold distribution block 2 9 through a rigid pipe.

[0066] The body support 2b and the slider support 10 are connected by a slider cable chain system 8. The slider cable chain system 8 contains upper mold hydraulic hoses and upper mold pneumatic hoses, with two upper mold hydraulic hoses positioned on either side of the system and multiple upper mold pneumatic hoses positioned in the middle. The lower interfaces of the upper mold distribution block 1 7 are connected to the corresponding lower interfaces of the upper mold distribution block 2 9 via upper mold hydraulic hoses or upper mold pneumatic hoses. The free end of the slider cable chain system 8 moves together with the slider 3 as it rises and falls.

[0067] A lower mold is fixed on the movable worktable 5, and a lower mold process cylinder is arranged in the lower mold. A movable worktable pipeline rear support 22 extending upwards is fixed to the rear end of one side of the movable worktable 5. Multiple threaded holes are machined along the height direction of the movable worktable pipeline rear support 22 for connecting the compression fitting 23. The movable worktable pipeline rear support 22 can also have threaded holes machined on both sides for easy double-sided connection.

[0068] A lower mold distribution block 20 is fixed to the outer front end of the movable worktable 5. The lower mold distribution block 20 and the rear support 22 of the movable table pipeline are located on the same side of the movable worktable 5, for example, both are located on the left side of the movable worktable 5. The bottom of the inner end of the lower mold distribution block 20 is fixed on the movable worktable 5, and the outer end extends outward along the width direction of the movable worktable 5. The upper surface and the front side of the lower mold distribution block 20 are each provided with a row of interfaces, and the interfaces on the upper surface and the interfaces on the front side are connected one-to-one. Each interface on the upper surface of the lower mold distribution block 20 is screwed with a ferrule connector 23. Each threaded hole of the rear support 22 of the movable table pipeline is connected to one end of a rigid pipe 24 through the ferrule connector 23. The other end of each rigid pipe 24 is connected to the corresponding upper surface interface on the lower mold distribution block 20 through the ferrule connector 23. Each rigid pipe 24 forms an oil passage and an air passage.

[0069] In order to make the oil and air lines of the lower mold process cylinder neatly arranged, a moving table pipe front support 21 is set near the lower mold distribution block 20. The bottom of the moving table pipe front support 21 is fixed on the moving worktable 5. Each rigid pipe 24 extends forward in the horizontal direction first, and multiple pipe clamps are fixed along the height direction of the moving table pipe front support 21 to fix each layer of rigid pipes to prevent vibration.

[0070] The lowest layer of rigid pipe passes through the pipe clamp on the front support 21 of the moving platform pipe and bends directly downwards. It is connected to the innermost upper surface interface of the lower mold distribution block 20 through the ferrule connector 23. The upper layers of rigid pipe are led out from the pipe clamp and bent outwards horizontally, and then bent downwards vertically. They are connected to the corresponding upper surface interface of the lower mold distribution block 20 through the ferrule connector 23.

[0071] A moving table cable carrier upper bracket 19 is fixed to the front side of the lower mold distribution block 20 to fix the moving worktable cable carrier 18. A horizontally extending rearward moving table cable carrier lower bracket 17 is located directly below the moving table cable carrier upper bracket 19, with its rear end fixed to the lower front end of the column. Both ends of the moving worktable cable carrier 18 are connected between the moving table cable carrier upper bracket 19 and the moving table cable carrier lower bracket 17. Both sides of the moving table cable carrier upper bracket 19 and the moving table cable carrier lower bracket 17 have upward-pointing folded edges to ensure that the moving worktable cable carrier 18 does not detach from the bracket when the moving worktable 5 moves.

[0072] The lower mold oil circuit valve block 15, lower mold air source, and lower mold pneumatic solenoid valve 16, which are matched with each lower mold process cylinder, are fixed on one side of the movable worktable 5. The upper pump station is connected to the main oil port of the lower mold oil circuit valve block 15 through only one oil inlet main pipe 12 and one oil return main pipe 13. The oil inlet main pipe 12 and the oil return main pipe 13 descend along the column 2. Oil distribution blocks 14 are set at the upper and lower parts of the column 2 to achieve deflection. This avoids the need for multiple oil pipes to connect the upper crossbeam 1 and the movable worktable 5.

[0073] Each oil outlet connector of the lower mold hydraulic valve block 15 is directly connected to the lower mold hydraulic hose, and each interface of the lower mold pneumatic solenoid valve 16 is connected to the lower mold pneumatic hose. The lower mold hydraulic hose and the lower mold pneumatic hose constitute the oil and air circuits 7 of the moving platform process cylinder, which are arranged in an orderly and aesthetically pleasing manner within the moving worktable cable chain 18. Considering weight balance, the heavier and thicker lower mold hydraulic hoses are arranged in pairs on the outer sides of the cable chain, while the lighter and thinner lower mold pneumatic hoses are arranged in the middle of the cable chain. This balances the weight of the hoses borne by the moving worktable cable chain 18, thereby improving the service life of the cable chain.

[0074] like Figures 6 to 9 As shown, V-shaped irons 5a with outward openings are respectively embedded in the middle of the two side walls of the movable worktable 5. The machine body and the rail 25 are respectively equipped with a pair of movable table locking devices, which are used to lock the position of the movable worktable 5 before and after it moves out, so as to ensure the repeatability of the movable worktable 5 in and out.

[0075] Locking device base plates 26 are welded to the outer wall of the track 25 at the positions where the movable worktable 5 is moved out. The movable table locking devices are respectively installed on the locking device base plates 26. Two triangular stiffeners are welded to the bottom of the locking device base plates 26. The two triangular stiffeners are parallel to each other and their vertical sides are welded to the outer wall of the track 25. The bottom of the locking cylinder support 27 is fixed to the locking device base plate 26 with screws.

[0076] A square groove is machined in the middle of the upper surface of the base plate 26 of the locking device. Pairs of wedges are provided on the front and rear sides of the locking cylinder support 27. The locking cylinder support 27 and the wedges on its front and rear sides are all located in the square groove.

[0077] The left and right widths of the square recess match the left and right widths of the locking cylinder support 27. The locking cylinder support 27 is embedded in the square recess of the locking device base plate 26, and its left and right directions are limited, so its position can only be adjusted in the front and back directions. The bottom of the fixed wedge 35 abuts against the front and back edge steps of the square recess to achieve limitation. A floating wedge 36 is inserted between the fixed wedge 35 and the locking cylinder support 27. The upper narrow and lower wide slope of the fixed wedge 35 fits into the upper wide and lower narrow slope of the floating wedge 36. Screws are screwed into the locking device base plate 26 from top to bottom. By adjusting the insertion depth of the floating wedge 36, the position of the locking cylinder support 27 in the front and back directions can be finely adjusted. After the position of the locking cylinder support 27 in the front and back directions is accurately adjusted, the screws are tightened to lock it.

[0078] The machine body has four corner columns 2, and the lower parts of the columns 2 on the same side are connected to each other by the lower connecting beams 2a. The two sides of the machine body are also equipped with moving table locking devices corresponding to the position before the moving worktable 5 is moved out. The moving table locking devices are installed on the locking device base plate 26, which is located in the square groove in the middle of the lower connecting beams 2a of the two columns. The corresponding locking cylinder support 27 and the wedges on its front and rear sides are also located in the square grooves on both sides of the machine body. The left and right sides of the locking cylinder support 27 are limited by the left and right edges of the square groove and form a force support, and the position can be finely adjusted in the front and rear direction.

[0079] A locking cylinder 28 is fixed to the outer wall of the locking cylinder support 27 via a flange. The piston rod of the locking cylinder 28 extends toward the side wall of the movable worktable 5. A circular locking cylinder pin 29 is fixedly connected to the free end of the locking cylinder piston rod 28a. The locking cylinder pin 29 slides within a guide sleeve 31, which is installed inside the locking cylinder support 27. A guide key 30 is fixed to the locking cylinder pin 29. The two sides of the guide key 30 are embedded in the long grooves of the guide sleeve 31 to ensure that the locking cylinder pin 29 extends and retracts along the axial direction.

[0080] The top of the locking cylinder support 27 is provided with a lubricating oil cup 37, which is used to inject lubricating oil into the inner cavity of the guide sleeve 31 to reduce the resistance and wear of the locking cylinder pin 29.

[0081] The locking cylinder pin 29 has cutting surfaces on both the front and rear sides of its free end, forming a positive V-shaped head. V-shaped blocks 5a are fixed to the left and right side walls of the movable worktable 5. Each V-shaped block 5a has a positive V-shaped notch with an outward opening in the middle, and the shape of the positive V-shaped notch matches the shape of the positive V-shaped head. After the movable worktable 5 is in position, the locking cylinder 28 drives the locking cylinder pin 29 to extend, and the positive V-shaped head of the locking cylinder pin 29 engages with the corresponding positive V-shaped notch of the V-shaped block 5a. This allows the movable worktable 5 to automatically align in the front-to-back direction, and the height direction is not affected by the floating of the movable worktable 5.

[0082] The front or rear side of the locking cylinder support 27 is machined with a square recessed groove. A proximity switch mounting plate 6b is fixed in the square recessed groove. A pin-locking proximity switch 34 and a pin-unlocking proximity switch 33 are respectively installed in the central long groove of the proximity switch mounting plate 6b, which are used to detect and send signals on the position of the locking cylinder pin 29.

[0083] The locking cylinder pin 29 has a sensing block 32 fixed on the side facing the proximity switch mounting plate 6b, and the guide sleeve 31 is also provided with a clearance groove along the length direction for the sensing block 32 to move.

[0084] Oil enters through the oil port 28b of the locking cylinder 28. After the locking cylinder pin 29 is inserted into the V-shaped iron 5a, the position of the sensing block 32 corresponds to the probe of the pin locking proximity switch 34, and the pin locking proximity switch 34 sends a locking signal to the control unit.

[0085] Oil enters through the oil port 28c of the rod chamber of the locking cylinder 28. After the locking cylinder pin 29 retracts, the position of the sensing block 32 corresponds to the probe of the pin unlocking proximity switch 33, which sends an unlocking signal to the control unit. The signal from the limit proximity switch forms an electrical interlock with the movement of the moving worktable 5 and the slider. The moving worktable 5 is not allowed to move when the locking cylinder pin 29 is not retracted, otherwise the locking cylinder pin 29 will be damaged and the side of the moving worktable will be scratched. The slider can only be pressurized after the locking cylinder pin 29 inside the machine body is firmly inserted and the pin locking proximity switch 34 sends a signal.

[0086] The servo reducer 44 drives the moving worktable 5 to move at high speed, decelerating in advance at the stopping position. The moving position of the moving worktable 5 is calculated by the number of rotations of the servo reducer 44, the reduction ratio of the reducer, and the pitch circle radius of the gears, and its stopping position can be controlled by the program. If there is a deviation in the stopping position, the positive V-shaped head of the locking cylinder pin 29 automatically aligns with the positive V-shaped notch installed on the side of the moving worktable. The working pressure of the locking cylinder 28 can be adjusted by the relief valve of the hydraulic system valve block.

[0087] The left and right sides of the locking cylinder support 27 abut against the sides of the square recess to bear the thrust of the locking cylinder 28. The contact surface between the locking cylinder support 27 and the square recess is connected by screws, and the screw holes on the locking cylinder support 27 are elongated holes to facilitate fine adjustment of the front and rear positions of the support. The front and rear positions of the locking cylinder support 27 are adjusted and fixed by wedges.

[0088] The mechanism makes it very convenient to adjust the working position of the locking cylinder 28. Simply loosen the screws that fix the locking cylinder support 27 to the square countersunk groove, and the locking cylinder pin 29 will extend. The positive V-shaped head of the locking cylinder pin 29 will engage with the V-shaped iron 5a installed on the left and right sides of the movable worktable, generating a lateral force in the front-back direction on the locking cylinder support 27. This will automatically adjust the locking cylinder support 27 to the position where the two sides are aligned. Then, tighten the connecting screws of the locking cylinder support 27 and the screws of the floating wedge 36, etc.

[0089] Due to the limitations imposed by the linear guide rail 38 and the guide slide 39, the movable worktable 5 cannot produce lateral displacement. Therefore, when the movable worktable 5 stops, there is only a positional error in the front-back direction. This movable table locking device cleverly operates on the V-shaped centering principle, with a simple, reliable, and practical structure. It is suitable for centering and positioning the high-speed movable worktable 5, ensuring the repeatability and positioning accuracy of the movable worktable 5 during operation.

[0090] like Figure 6As shown, the proximity switch mounting plate 6b is installed in the elongated countersunk hole on the rear side of the upper surface of the machine body worktable 6. Two proximity switches can be installed: one to control the deceleration point of the moving worktable, and the other to control the stop point of the moving worktable. A machine body discharge hole 6a is opened in the middle of the machine body worktable 6, and a moving worktable discharge hole 5d is also opened in the middle of the moving worktable. When the moving worktable moves into the machine body, the moving worktable discharge hole 5d aligns perfectly with the machine body discharge hole 6a, allowing the scrap material to fall onto the waste conveyor belt below the worktable for transport. A conveyor belt installation window 2c is located below the connecting beam 2a under the column for installing the waste conveyor belt.

[0091] The upper surface of the machine body worktable 6 is machined with a countersunk groove for mounting linear guide rails. The rear stop components 6c are mounted on the rear part of the upper surface of the machine body worktable 6, arranged symmetrically in pairs.

[0092] like Figure 10 , Figure 11 As shown, the movable worktable is symmetrically machined with multiple sets of stepped through holes around its own axis for mounting disc springs, disc spring seats 41, and disc spring covers 43. The lower large end of the disc spring seat 41 is placed in the countersunk hole on the upper surface of the movable stage support 5b. Multiple sets of disc springs are fitted on the central rod of the disc spring seat 41 and embedded in the through hole of the movable worktable. The center of the central rod of the disc spring seat has a disc spring seat central hole. Screws are inserted into the disc spring seat central hole and screwed into the movable stage support 5b to fix the disc spring seat 41. The disc spring cover 43 covers the disc spring and is embedded in the large hole of the stepped through hole.

[0093] The lifting of the movable worktable relies on the combination of disc springs 42. The gap δH between the top of the movable worktable support 5b and the bottom of the movable worktable is greater than the gap δS between the bottom of the movable worktable and the top of the machine body worktable 6. The disc springs are arranged in pairs at the four corners of the movable worktable. The slider presses down on the movable worktable, closing the gap δS between the movable worktable and the machine body worktable 6. The movable worktable bears the pressing force of the slider. The total disc spring deformation force is the sum of the gap δS, the movable worktable, and the deformation force generated by the weight of the mold. When the slider presses down, the disc springs 42 are compressed, offsetting part of the nominal force of the slider.

[0094] The upper part of the center hole of the disc spring seat is machined with a threaded hole, which can be used to lift the moving worktable. It also makes it easy to screw the lifting screw into the threaded hole to remove the entire disc spring assembly, which is convenient for maintenance and replacement of damaged disc spring 42. This structure is easy to maintain, and the disc spring 42 can be replaced and maintained without disassembling or flipping the moving worktable.

[0095] After the slider returns to its original position following pressure relief, the spring force of the disc spring assembly immediately lifts the moving worktable and lower mold. This rapid lifting eliminates the need for the lifting cylinder and hydraulic pump valve control required in conventional moving worktables, significantly improving work efficiency. The moving table support 5b is connected to the guide slide 39 via countersunk screws. A rack 5c extending in the front-rear direction is installed on the lower outer side of the moving table support 5b. The racks 5c on both sides of the moving table support 5b mesh with gears 46, which are fixed to gear shafts. The tops of the gears protrude from the upper grooves of the rails 25 and mesh with the corresponding racks 5c. The gear shafts on both sides are connected to each other via universal joints 45, and one gear shaft is connected to the output end of the moving table servo reducer 44.

[0096] The two tracks 25 are symmetrically arranged on the left and right sides. The left and right tracks 25 are connected as a whole by a square tube bracket 40. The moving stage servo reducer 44 is fixed on the outside of one track. The moving stage servo reducer 44 drives the gear 46 to rotate. The gear 46 drives the rack 5c and the moving worktable to move in and out along the linear guide rail.

[0097] The rear side of the rail mates with the machined stop surface on the side of the machine body and is secured with screws. Two grooves are machined on the upper surface of the rail. The inner groove extends and corresponds to the linear guide mounting groove on the machine body's worktable 6, used for mounting the linear guide. The outer groove avoids interference with the rack 5c on the moving worktable. Front stops 25a are provided on the front side of the rail to prevent the moving worktable from continuing to move forward and derailing if the stop signal fails.

[0098] like Figure 12 As shown, the pressure oil circuit is connected to the inlet of cartridge valve C1 and cartridge valve C2, the outlet of cartridge valve C1 is connected to the upper chamber oil port of the main cylinder 4, the outlet of cartridge valve C2 is connected to the inlet of cartridge valve C3, and the outlet of cartridge valve C3 is connected to the lower chamber oil port of the main cylinder 4.

[0099] The pressure oil circuit is connected to the P port of the three-position four-way solenoid directional valves one and two. The T port of the three-position four-way solenoid directional valves one and two is connected to the oil tank. The A port of the three-position four-way solenoid directional valves one and two is connected to the plug chamber oil port of each locking cylinder 28. The B port of the three-position four-way solenoid directional valves one and two is connected to the rod chamber oil port of each locking cylinder 28.

[0100] When electromagnetic coils YV2, YV15, YV26, and YV28 are energized, the pistons of each locking cylinder 28 extend their driving pins, locking the moving worktable. When electromagnetic directional valves YV2, YV15, YV26, and YV27 are energized, the pistons of each locking cylinder 28 retract their driving pins, releasing the moving worktable. The operation of the other set of locking cylinders is similar.

[0101] The pressure oil circuit is connected to the P port of the three-position four-way solenoid valves three and four. The T port of the three-position four-way solenoid valves three and four is connected to the oil tank. The A port of the three-position four-way solenoid valves three and four is connected to the plug cavity oil port of each lower mold process cylinder 47. The B port of the three-position four-way solenoid valves three and four is connected to the rod cavity oil port of each lower mold process cylinder 47.

[0102] When electromagnetic coils YV23 and YV25 are energized, the piston rods of each lower mold process cylinder 47 extend to punch holes in the four walls of the refrigerator liner; after the four walls are punched, electromagnetic coils YV22 and YV24 are energized, and the piston rods of each lower mold process cylinder 47 retract.

[0103] The pressure oil circuit is connected to the P port of the three-position four-way solenoid directional valve five. The T port of the three-position four-way solenoid directional valve five is connected to the oil tank. The A port of the three-position four-way solenoid directional valve five is connected to the plug chamber oil port of each upper mold process cylinder 48. The B port of the three-position four-way solenoid directional valve five is connected to the rod chamber oil port of each upper mold process cylinder 48. The neutral position function of the three-position four-way solenoid directional valve five is Y type. The neutral position functions of the three-position four-way solenoid directional valves one to five are all Y type.

[0104] When the electromagnetic coil YV21 is energized, the piston rods of each upper mold process cylinder 48 extend to punch holes in the bottom wall of the refrigerator liner; after the bottom wall of the refrigerator is punched, the electromagnetic coil YV20 is energized, and the piston rods of each upper mold process cylinder 48 retract.

[0105] The above description is merely a preferred embodiment of the present invention, showing and describing the basic principles, main features, and advantages of the present invention. It is not intended to limit the scope of patent protection of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. In addition to the above embodiments, the present invention may have other implementations without departing from the spirit and scope of the invention. Various changes and modifications to the present invention are possible, and all technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents. Technical features not described in the present invention can be implemented by or using existing technology, and will not be elaborated here.

Claims

1. A hydraulic press for punching holes in a refrigerator liner, comprising a machine body, an upper crossbeam on the upper part of the machine body, a main cylinder mounted in the middle of the upper crossbeam, a slider suspended from the lower end of the plunger of the main cylinder, and a machine body worktable on the lower part of the machine body, wherein a movable worktable is covered on the machine body worktable, characterized in that: The top groove of the machine body worktable is fitted with a linear guide rail extending in the front-to-back direction, and a guide slide is installed on the linear guide rail; a moving platform support is installed on the lower sides of the moving platform, and the bottom of the moving platform support is supported on the guide slide. The movable worktable is symmetrically machined with multiple sets of stepped through holes around its own axis. Multiple sets of disc springs are embedded in each stepped through hole. The bottom disc spring is supported on the movable worktable support. The disc spring cover is pressed on the top of the disc spring and fixed in the large hole of the stepped through hole. A lower mold is fixed on the movable worktable. The lower mold is equipped with multiple lower mold process cylinders for punching holes in the four walls of the refrigerator liner. A movable worktable pipeline rear support extending upward is fixed to one rear side of the movable worktable. A lower mold distribution block extending outward is fixed to the front end of the movable worktable. Multiple rigid pipes are connected along the height direction of the rear support of the moving platform pipeline. The front end of each rigid pipe is bent and connected to the upper surface interface of the lower mold distribution block. The lower mold oil circuit valve block and the lower mold pneumatic solenoid valve, which are matched with each lower mold process cylinder, are fixed on one side of the moving worktable. The oil outlet connectors of the lower mold oil circuit valve block are directly connected to the lower mold hydraulic hose. The interfaces of the lower mold pneumatic solenoid valve are connected to the lower mold pneumatic hose. The other end of each lower mold hydraulic hose and the lower mold pneumatic hose are respectively connected to the front side interface of the lower mold distribution block. The front side of the lower mold distribution block is fixed with an upper bracket of the moving platform cable chain, and a lower bracket of the moving platform cable chain extending horizontally backward is provided directly below the upper bracket of the moving platform cable chain. The rear end of the lower bracket of the moving platform cable chain is fixed to the lower end of the front side of the column. The two ends of the moving worktable cable chain are connected between the upper bracket of the moving platform cable chain and the lower bracket of the moving platform cable chain. The hydraulic hoses and pneumatic hoses of each lower mold are neatly arranged in the moving worktable cable chain. The upper mold is fixed below the slider. The upper mold is equipped with multiple upper mold process cylinders for punching holes in the bottom wall of the refrigerator liner. The upper mold oil circuit valve block and the upper mold pneumatic solenoid valve that control the upper mold process cylinders are fixed on the upper crossbeam. The upper rear side of the machine body is fixed with a machine body support. The rear end of the machine body support is fixed with an upper mold distribution block one. The interfaces of the upper mold oil circuit valve block and the upper mold pneumatic solenoid valve are respectively connected to the upper interface of the upper mold distribution block one through rigid pipes. The upper mold oil port bracket and the slider bracket are fixed on the rear side of the slider and move up and down with the slider. The interface of each upper mold process cylinder is fixed on the upper mold oil port bracket. The upper mold distribution block two is fixed on the slider bracket. The interface of each upper mold process cylinder is connected to the upper interface of the upper mold distribution block two through a rigid pipe. The body support and the slider support are connected by a slider drag chain system. The slider drag chain system is equipped with upper mold hydraulic hose and upper mold pneumatic hose. Each lower interface of upper mold distribution block one is connected to the corresponding lower interface of upper mold distribution block two through upper mold hydraulic hose or upper mold pneumatic hose.

2. The refrigerator liner punching hydraulic press according to claim 1, characterized in that: Each set of disc springs is respectively mounted on the central rod of the disc spring seat. The bottom disc spring abuts against the lower large end of the disc spring seat. The lower large end of the disc spring seat is embedded in the countersunk hole on the moving platform support. A central hole of the disc spring seat is provided along the axis of the central rod of the disc spring seat. Screws are inserted into the central hole of the disc spring seat and screwed into the moving platform support to fix the disc spring seat.

3. The refrigerator liner punching hydraulic press according to claim 2, characterized in that: The disc spring seat has a stepped hole that is wider at the top and narrower at the bottom, and the upper end of the disc spring seat has an internal thread for lifting and moving the worktable.

4. The refrigerator liner punching hydraulic press according to claim 1, characterized in that: The outer bottom of the shift support is equipped with racks extending in the front-rear direction. The two racks mesh with gears respectively. The two gears are fixed on the gear shafts respectively, and the tops of the gears protrude from the upper grooves of the corresponding rails. The gear shafts on both sides are connected to each other through universal joints. One gear shaft is connected to the output end of the shift servo reducer.

5. The refrigerator liner punching hydraulic press according to claim 4, characterized in that: The two side walls of the movable worktable are respectively fitted with V-shaped irons with outward openings; the outer sides of the track and the machine body worktable are respectively fixed with locking device base plates. The upper surface of the locking device base plate is provided with a square recess. A locking cylinder support is embedded in the square recess. A locking cylinder is fixed on the outer side of the locking cylinder support. The free end of the piston rod of the locking cylinder is connected to the root of the locking cylinder pin. The circumference of the locking cylinder pin is located in the guide sleeve. The guide sleeve is fixed in the locking cylinder support. The front and rear sides of the end of the locking cylinder pin are symmetrically provided with cutting surfaces to form a positive V-shaped head. The positive V-shaped head matches the positive V-shaped notch of the V-shaped iron.

6. The refrigerator liner punching hydraulic press according to claim 5, characterized in that: The left and right sides of the locking cylinder support abut against the left and right edges of the square recess. The front and rear sides of the locking cylinder support and the front and rear edges of the square recess are respectively provided with fixed wedges and floating wedges. The upper narrow and lower wide inclined surface of the fixed wedge and the upper wide and lower narrow inclined surface of the floating wedge fit together. The screws are screwed into the square recess of the locking device base plate from top to bottom.

7. The refrigerator liner punching hydraulic press according to claim 5, characterized in that: A guide key is fixed on the locking cylinder pin, and the guide key is embedded in the long groove of the guide sleeve.

8. The refrigerator liner punching hydraulic press according to claim 5, characterized in that: A sensing block is fixed on the locking cylinder pin, and a sensing block clearance groove extending axially is provided on the guide sleeve; a square recessed groove is machined on the front or rear side of the locking cylinder support, and a proximity switch mounting plate is fixed in the square recessed groove; a pin-locking proximity switch and a pin-unlocking proximity switch are respectively installed in the central long groove of the proximity switch mounting plate.

9. The refrigerator liner punching hydraulic press according to claim 8, characterized in that: The servo reducer drives the moving worktable to translate at a speed of 500-600 mm / s. The moving position of the moving worktable is calculated by the number of rotations of the servo reducer, the reduction ratio of the reducer, and the pitch circle radius of the gear. The reducer decelerates in advance at the stopping position. The deviation of the stopping position is automatically aligned by the positive V-shaped head of the locking cylinder pin being inserted into the positive V-shaped notch of the V-shaped iron on the side of the moving worktable.

10. The refrigerator liner punching hydraulic press according to claim 1, characterized in that: The front end of the movable worktable is fixed with an upwardly extending movable stage pipeline front bracket, which is located behind the lower mold distribution block. The front ends of each rigid pipe are fixed to the movable stage pipeline front bracket by pipe clamps.

11. The refrigerator liner punching hydraulic press according to claim 5, characterized in that: In the hydraulic system, the pressure oil circuit is connected to the inlet of cartridge valve C1 and cartridge valve C2, the outlet of cartridge valve C1 is connected to the upper chamber oil port of the main cylinder (4), the outlet of cartridge valve C2 is connected to the inlet of cartridge valve C3, and the outlet of cartridge valve C3 is connected to the lower chamber oil port of the main cylinder (4). The pressure oil circuit is connected to the P port of the three-position four-way solenoid valve one and two, the T port of the three-position four-way solenoid valve one and two is connected to the oil tank, the A port of the three-position four-way solenoid valve one and two is connected to the plug chamber oil port of each locking cylinder (28), and the B port of the three-position four-way solenoid valve one and two is connected to the rod chamber oil port of each locking cylinder (28). The pressure oil circuit is connected to the P port of the three-position four-way solenoid valves three and four, the T port of the three-position four-way solenoid valves three and four is connected to the oil tank, the A port of the three-position four-way solenoid valves three and four is connected to the plug cavity oil port of each lower mold process cylinder (47), and the B port of the three-position four-way solenoid valves three and four is connected to the rod cavity oil port of each lower mold process cylinder (47). The pressure oil circuit is connected to the P port of the three-position four-way solenoid directional valve five. The T port of the three-position four-way solenoid directional valve five is connected to the oil tank. The A port of the three-position four-way solenoid directional valve five is connected to the plug chamber oil port of each upper mold process cylinder (48). The B port of the three-position four-way solenoid directional valve five is connected to the rod chamber oil port of each upper mold process cylinder (48). The middle position function of the three-position four-way solenoid directional valve five is Y type. The middle position functions of the three-position four-way solenoid directional valves one to five are all Y type.

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