A kind of chalcogenide material aspheric lens numerical control processing machine tool
By installing a spray nozzle and a receiving plate to recover cutting oil on a CNC machining tool for aspherical lenses made of chalcogenide materials, and using a dual-axis motor to drive the baffle plate to rotate and wipe with a sponge block, the problem of difficult cutting oil recovery is solved, and the recycling of cutting oil and the improvement of machining accuracy are realized.
Patent Information
- Application Number
- CN202522096728.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-29
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-09-29
AI Technical Summary
The existing cutting oil system of CNC machining tools for aspherical lenses made of chalcogenide materials cannot be effectively recycled, resulting in high cutting oil consumption. Furthermore, the cutting oil remaining on the baffle plate is difficult to recycle and reuse, affecting machining accuracy and cost.
Cutting oil is sprayed from nozzles and collected by a receiving tray. Combined with the rotation of the baffle plate driven by a dual-axis motor and the wiping by a sponge block, the cutting oil is recycled and residual oil is recovered.
This enables the recycling of cutting oil, reduces cutting oil consumption, lowers machining costs, and improves machining accuracy.
Smart Images
Figure CN224674533U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of lens processing technology, and in particular relates to a CNC machine tool for processing aspherical lenses made of chalcogenide materials. Background Technology
[0002] Chalcogenide aspherical lenses are optical elements that combine the properties of chalcogenide glass with aspherical design. They have unique optical performance and broad application prospects, and are widely used in infrared thermal imaging, medical equipment, gas sensing, consumer electronics and aerospace. CNC machine tools are one of the most common pieces of equipment in the processing of chalcogenide aspherical lenses, and are used to perform turning and other processing on chalcogenide aspherical lenses.
[0003] Existing CNC machining tools for aspherical lenses made of chalcogenide materials mainly consist of a machine tool body, a machining device, a lens fixing device, a cutting oil system, and a control system. The machining device is used to cut the lens, the lens fixing device is used to clamp and fix the lens, and the cutting oil system is used to supply cutting oil to the lens during the cutting process. However, existing cutting oil systems are mainly spray-type, and the cutting oil is sprayed and cannot be recovered, which is detrimental to the environment and cannot achieve the precision requirements of conventional products. In addition, in order to prevent the cutting oil from splashing during the cutting process, a baffle is usually installed on the machining device. However, after the lens is cut, some cutting oil adheres to the baffle, which is not easy to recover, resulting in a large consumption of cutting oil.
[0004] To address these issues, we provide a CNC machining tool for aspherical lenses made of chalcogenide materials. Utility Model Content
[0005] The purpose of this invention is to provide a CNC machining tool for aspherical lenses made of chalcogenide materials. Cutting oil is sprayed onto the lens through a nozzle, and the sprayed cutting oil is recovered through a receiving plate, solving the problem of inconvenient recycling of cutting oil in existing systems. Simultaneously, a dual-axis motor drives a baffle plate to rotate, causing the baffle plate to contact a sponge block. A movable plate then drives the sponge block to recover the residual cutting oil on the baffle plate, solving the problem of inconvenient recycling and reuse of residual cutting oil on existing systems.
[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:
[0007] This utility model relates to a CNC machine tool for machining aspherical lenses made of chalcogenide materials. It includes a machine body, a protective cover fixedly connected to the top of the machine body, a protective door rotatably connected to the protective cover, a machining box for cutting the lens fixedly connected to one side of the inner side of the protective cover, and clamping tables for holding the lens movably connected to the front and rear ends of the other side of the inner side of the protective cover. A cutting oil assembly is provided inside the protective cover, comprising a receiving tray movably connected to the lower part of the machining box, an oil tank fixedly connected to one side of the inner side of the protective cover, and a U-shaped frame fixedly connected to the top of the clamping table. A recovery pipe is fixedly connected to the front end of the receiving tray, and the end of the recovery pipe away from the receiving tray extends to the outside of the machining box and is fixedly connected to a first telescopic hose. A recovery pump is fixedly connected to one end of the recovery pipe. The recovery pump is fixedly connected to the front end of the oil tank. A sleeve is rotatably connected inside the U-shaped frame. A nozzle is fitted inside the sleeve. One end of the nozzle is fixedly connected to a second telescopic hose. The end of the second telescopic hose away from the nozzle is fixedly connected to a discharge pump. A baffle assembly is also provided on the processing box. The baffle assembly includes a mounting plate fixedly connected to the processing box. A baffle plate is rotatably connected to one side of the outer wall of the mounting plate. A dual-axis motor for driving the baffle plate to rotate is also fixedly connected to one side of the outer wall of the mounting plate. Slide grooves are opened vertically at both the front and rear ends of the outer wall of the mounting plate. A slider is slidably connected inside the slide groove. A movable plate is movably connected to one side of the slider. A sponge block is adhered to the outer wall of the movable plate away from the slider.
[0008] A further feature of this invention is that a first hydraulic cylinder is fixedly connected to the center of one side outer wall of the processing box, and the output shaft of the first hydraulic cylinder extends to the inside of the processing box and is fixedly connected to the center of one side outer wall of the receiving plate.
[0009] A further feature of this invention is that: both the front and rear ends of the outer wall of one side of the receiving plate are fixedly connected to limit rods, and the end of the limit rod away from the receiving plate extends to the outside of the processing box and is fixedly connected to a limit plate.
[0010] A further feature of this invention is that a flow guide block is fixedly connected to the bottom inner side of the receiving disk.
[0011] A further feature of this invention is that the discharge end of the recovery pump and the inlet end of the discharge pump both extend to the inside of the oil tank, and the discharge pump is fixedly connected to the front and rear ends of the top of the oil tank.
[0012] A further feature of this invention is that mounting rods are fixedly connected to both the front and rear ends of the sleeve. The end of the mounting rod away from the sleeve passes through the vertical support arm of the U-shaped frame and is threadedly connected to a damping plate. The damping plates are respectively attached to the vertical support arm of the U-shaped frame.
[0013] The present invention is further configured such that: mounting bases are fixedly connected to the front and rear ends of one side outer wall of the mounting plate, and connecting rods are rotatably connected to the mounting bases; one end of the connecting rod is fixedly connected to the front and rear end faces of the baffle plate, and the other end of the connecting rod is fixedly connected to a driven gear; a dual-axis motor is fixedly connected to the upper side outer wall of one side of the mounting plate via a motor frame; a drive rod is fixedly connected to the output shaft of the dual-axis motor; and a drive gear is fixedly connected to the end of the drive rod away from the dual-axis motor; the drive gear meshes with the driven gear above.
[0014] A further feature of this invention is that: a fixing plate is fixedly connected to both the front and rear ends of the upper surface of the mounting plate; a second hydraulic cylinder is fixedly connected to the upper surface of each fixing plate; the output shaft of the second hydraulic cylinder extends to the inner side of the slide groove and is fixedly connected to the top of the slider; a third hydraulic cylinder is fixedly connected to the outer wall of the other side of the slider; the output shaft of the third hydraulic cylinder passes through the slider and is fixedly connected to the movable plate.
[0015] This utility model has the following beneficial effects:
[0016] 1. This utility model, by setting up a cutting oil assembly, starts the discharge pump. Under the action of the discharge pump, the cutting oil in the oil tank enters the nozzle through the second telescopic hose, and the cutting oil is sprayed onto the lens through the nozzle. Then, the receiving plate is moved to the bottom of the lens, and the receiving plate recovers the sprayed cutting oil. At the same time, the recovery pump is started. Under the action of the recovery pump, the cutting oil in the receiving plate flows back into the oil tank through the recovery pipe and the first telescopic hose, which facilitates the recycling of cutting oil, reduces cutting oil consumption, lowers processing costs, and facilitates the processing of aspherical lenses made of chalcogenide materials.
[0017] 2. This utility model, by setting up a baffle assembly and starting a dual-axis motor, keeps the baffle plate in a vertical state. A third hydraulic cylinder drives a movable plate and a sponge block to contact the baffle plate. Then, a second hydraulic cylinder drives a slider and a movable plate to move up and down, so that the movable plate drives the sponge block to wipe the baffle plate. This facilitates the recovery of residual cutting oil on the baffle plate, reduces cutting oil consumption, lowers processing costs, and facilitates the processing of aspherical lenses made of chalcogenide materials. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1This is a schematic diagram of the overall structure of this utility model.
[0020] Figure 2 This is a front view of the machine tool body of this utility model.
[0021] Figure 3 This is a schematic diagram of the cutting oil assembly of this utility model.
[0022] Figure 4 This is a schematic diagram of the receiving disk of this utility model.
[0023] Figure 5 This is a structural disassembly diagram of the U-shaped frame and nozzle of this utility model.
[0024] Figure 6 This is a schematic diagram of the material blocking assembly of this utility model.
[0025] Figure 7 This is a schematic diagram of the mounting plate of this utility model.
[0026] Figure 8 This is a structural disassembly diagram of the baffle plate and the dual-axis motor of this utility model.
[0027] Figure 9 This is a structural disassembly diagram of the movable plate and sponge block of this utility model.
[0028] The attached diagram lists the components represented by each number as follows:
[0029] 1-Machine tool body, 2-Protective cover, 201-Protective door, 3-Machining box, 4-Clamping table, 5-Cutting oil assembly, 501-Receiving tray, 501a-First hydraulic cylinder, 501b-Limit rod, 501c-Limit plate, 501d-Recovery pipe, 501e-Guide block, 502-Oil tank, 502a-Recovery pump, 502b-First telescopic hose, 502c-Discharge pump, 502d-Second telescopic hose, 503-U-shaped frame, 503a-Sleeve, 503b-Installation Rod, 503c-damping plate, 504-nozzle, 6-baffle assembly, 601-mounting plate, 601a-mounting base, 601b-slide groove, 601c-fixed plate, 602-baffle plate, 602a-connecting rod, 602b-driven gear, 603-dual-axis motor, 603a-motor frame, 603b-drive rod, 603c-drive gear, 604-moving plate, 604a-slider, 604b-second hydraulic cylinder, 604c-third hydraulic cylinder, 605-sponge block. Detailed Implementation
[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0031] Example 1
[0032] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The first embodiment of this utility model is shown, which provides a CNC machining tool for aspherical lenses made of chalcogenide materials. The tool includes a machine body 1, a protective cover 2 fixedly connected to the top of the machine body 1, a protective door 201 rotatably connected to the protective cover 2, a machining box 3 fixedly connected to one side of the inner side of the protective cover 2, and a machining device for cutting the lens inside the machining box 3. A clamping table 4 for holding the lens is movably connected to the front and rear ends of the other side of the inner side of the protective cover 2. A cutting oil assembly 5 is provided inside the protective cover 2. The cutting oil assembly 5 includes a receiving tray 501, an oil tank 502, a U-shaped frame 503, and a nozzle 504. The nozzle 504 sprays cutting oil onto the lens, and the receiving tray 501 collects the sprayed cutting oil, solving the problem of the inconvenience of recycling cutting oil in existing systems.
[0033] Specifically, the receiving tray 501 is movably connected to the lower interior of the processing box 3. The end of the recovery pipe 501d away from the receiving tray 501 extends to the outside of the processing box 3 and is fixedly connected to a first telescopic hose 502b. The end of the first telescopic hose 502b away from the recovery pipe 501d is fixedly connected to a recovery pump 502a. The recovery pump 502a is fixedly connected to the front end face of the oil tank 502. The oil tank 502 is fixedly connected to one side of the inside of the protective cover 2. The U-shaped frame 503 is fixedly connected to the top of the clamping table 4. The recovery pipe 501d is fixedly connected to the front end face of the receiving tray 501. A sleeve 503a is rotatably connected inside the U-shaped frame 503. A nozzle 504 is fitted inside the sleeve 503a. One end of the nozzle 504 is fixedly connected to a second telescopic hose 502d. A discharge pump 502c is fixedly connected to the end away from the nozzle 504. The receiving plate 501 and the recovery pump 502a are used to recover and reuse the sprayed cutting oil. The recovery pipe 501d and the first telescopic hose 502b are used to connect the receiving plate 501 to the oil tank 502. The oil tank 502 is used to store the cutting oil. The inside of the oil tank 502 is also equipped with a filter structure to filter the recovered cutting oil. The discharge pump 502c and the second telescopic hose 502d are used to output the cutting oil in the oil tank 502. The U-shaped frame 503 is used to install the sleeve 503a. The sleeve 503a is used to install the nozzle 504 and adjust the tilt angle of the nozzle 504. The nozzle 504 is used to spray the cutting oil onto the lens.
[0034] Furthermore, a first hydraulic cylinder 501a is fixedly connected to the center of one side outer wall of the processing box 3. The output shaft of the first hydraulic cylinder 501a extends to the inside of the processing box 3 and is fixedly connected to the center of one side outer wall of the receiving plate 501.
[0035] Limiting rods 501b are fixedly connected to the front and rear ends of the outer wall of one side of the receiving plate 501. The end of the limiting rod 501b away from the receiving plate 501 extends to the outside of the processing box 3 and is fixedly connected to the limiting plate 501c.
[0036] A flow guide block 501e is fixedly connected to the inner bottom of the receiving disk 501;
[0037] The discharge end of the recovery pump 502a and the inlet end of the discharge pump 502c both extend to the inside of the oil tank 502, and the discharge pump 502c is fixedly connected to the front and rear ends of the top of the oil tank 502 respectively.
[0038] Mounting rods 503b are fixedly connected to both the front and rear ends of the sleeve 503a. The end of the mounting rod 503b away from the sleeve 503a passes through the vertical support arm of the U-shaped frame 503 and is threadedly connected to a damping plate 503c. The damping plates 503c are respectively attached to the vertical support arm of the U-shaped frame 503.
[0039] The operation process of this embodiment is as follows: the discharge pump 502c is started. Under the action of the discharge pump 502c, the cutting oil in the oil tank 502 enters the nozzle 504 through the second telescopic hose 502d and sprays the cutting oil onto the lens through the nozzle 504. Then, the receiving plate 501 is moved to the bottom of the lens and the cutting oil sprayed out is recovered through the receiving plate 501. At the same time, the recovery pump 502a is started. Under the action of the recovery pump 502a, the cutting oil in the receiving plate 501 flows back into the oil tank 502 through the recovery pipe 501d and the first telescopic hose 502b, thus realizing the recycling of cutting oil.
[0040] Example 2
[0041] Please see Figure 1 , Figure 2 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, this is the second embodiment of the present invention. This embodiment is based on the previous embodiment, but differs from the previous embodiment in that: a baffle assembly 6 is also provided on the processing box 3. The baffle assembly 6 includes a mounting plate 601, a baffle plate 602, a dual-axis motor 603, a movable plate 604, and a sponge block 605. The dual-axis motor 603 drives the baffle plate 602 to rotate, so that the baffle plate 602 contacts the sponge block 605. The movable plate 604 drives the sponge block 605 to recover the cutting oil remaining on the baffle plate 602, thus solving the problem that it is inconvenient to recover and reuse the cutting oil remaining on the baffle plate 602 in the existing system.
[0042] Specifically, the mounting plate 601 is fixedly connected to the processing box 3. A baffle plate 602 is rotatably connected to one outer wall of the mounting plate 601. A dual-axis motor 603 is also fixedly connected to one outer wall of the mounting plate 601. Slide grooves 601b are vertically formed at both the front and rear ends of the outer wall of the mounting plate 601. Slider blocks 604a are slidably connected inside each slide groove 601b. A movable plate 604 is movably connected to one side of each slider 604a. A sponge block 605 is adhered to the outer wall of the movable plate 604 away from the slider 604a. The mounting plate 601 is designed to hold the baffle plate 602, etc. The structure is installed on the machining box 3. The slide groove 601b is set to slide the slider 604a on the mounting plate 601. The baffle plate 602 is set to prevent cutting oil from splashing. The dual-axis motor 603 is set to drive the baffle plate 602 to rotate, realizing the adjustment of the tilt angle of the baffle plate 602. The movable plate 604 is set to drive the sponge block 605 to move. The slider 604a is set to movably install the movable plate 604 on the mounting plate 601. The sponge block 605 is set to recover the cutting oil remaining on the baffle plate 602.
[0043] Furthermore, mounting bases 601a are fixedly connected to the front and rear ends of the outer wall of one side of the mounting plate 601. A connecting rod 602a is rotatably connected to each mounting base 601a. One end of the connecting rod 602a is fixedly connected to the front and rear end faces of the baffle plate 602, and the other end of the connecting rod 602a is fixedly connected to a driven gear 602b.
[0044] The dual-axis motor 603 is fixedly connected to the upper side of the outer wall of the mounting plate 601 via the motor frame 603a. The output shafts of the dual-axis motor 603 are all fixedly connected to drive rods 603b. The end of the drive rod 603b away from the dual-axis motor 603 is fixedly connected to the drive gear 603c. The drive gear 603c is meshed above the driven gear 602b.
[0045] Mounting plate 601 has a fixed plate 601c fixedly connected to both the front and rear ends of the upper surface of mounting plate 601. A second hydraulic cylinder 604b is fixedly connected to the upper surface of the fixed plate 601c. The output shaft of the second hydraulic cylinder 604b extends to the inner side of the slide groove 601b and is fixedly connected to the top of the slider 604a. A third hydraulic cylinder 604c is fixedly connected to the outer wall of the other side of the slider 604a. The output shaft of the third hydraulic cylinder 604c passes through the slider 604a and is fixedly connected to the movable plate 604.
[0046] The rest of the structure is the same as in Example 1.
[0047] The operation process of this embodiment is as follows: Start the dual-axis motor 603 to keep the baffle plate 602 in a vertical state, and drive the movable plate 604 and the sponge block 605 to contact the baffle plate 602 through the third hydraulic cylinder 604c. Then, drive the slider 604a and the movable plate 604 to move up and down through the second hydraulic cylinder 604b, so that the movable plate 604 drives the sponge block 605 to wipe the baffle plate 602, thereby realizing the recovery of the cutting oil remaining on the baffle plate 602.
[0048] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0049] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it.
Claims
1. A CNC machining tool for aspherical lenses made of chalcogenide materials, comprising a machine body (1), wherein a protective cover (2) is fixedly connected to the top of the machine body (1), and a protective door (201) is rotatably connected to the protective cover (2); a machining box (3) for cutting the lens is fixedly connected to one side inside the protective cover (2), and a clamping table (4) for clamping the lens is movably connected to the front and rear ends of the other side inside the protective cover (2), characterized in that: A cutting oil assembly (5) is provided inside the protective cover (2), and the cutting oil assembly (5) includes a receiving plate (501) movably connected to the lower part of the machining box (3), an oil tank (502) fixedly connected to one side of the protective cover (2), and a U-shaped frame (503) fixedly connected to the top of the clamping table (4). A recovery pipe (501d) is fixedly connected to the front end face of the receiving plate (501), and the recovery pipe (501d) is far away from the receiving plate (501). The end extends to the outside of the processing box (3) and is fixedly connected to a first telescopic hose (502b). The end of the first telescopic hose (502b) away from the recovery pipe (501d) is fixedly connected to a recovery pump (502a), and the recovery pump (502a) is fixedly connected to the front end face of the oil tank (502). The U-shaped frame (503) is rotatably connected to a sleeve (503a), and a nozzle (504) is sleeved inside the sleeve (503a). The nozzle (504) 04) One end is fixedly connected to a second telescopic hose (502d), and the end of the second telescopic hose (502d) away from the nozzle (504) is fixedly connected to a discharge pump (502c). The processing box (3) is also provided with a baffle assembly (6), and the baffle assembly (6) includes a mounting plate (601) fixedly connected to the processing box (3). A baffle plate (602) is rotatably connected to one side of the outer wall of the mounting plate (601), and one side of the mounting plate (601) is connected to a baffle plate (602). A dual-axis motor (603) for driving the baffle plate (602) to rotate is also fixedly connected to the outer side wall. The front and rear ends of the outer wall of the mounting plate (601) are provided with vertical grooves (601b), and sliders (604a) are slidably connected inside the grooves (601b). A movable plate (604) is movably connected to one side of the slider (604a), and a sponge block (605) is adhered to the outer wall of the movable plate (604) away from the slider (604a).
2. The CNC machining tool for aspherical lenses made of chalcogenide materials according to claim 1, characterized in that, A first hydraulic cylinder (501a) is fixedly connected to the center of one side outer wall of the processing box (3), and the output shaft of the first hydraulic cylinder (501a) extends to the inside of the processing box (3) and is fixedly connected to the center of one side outer wall of the receiving plate (501).
3. The CNC machining tool for aspherical lenses made of chalcogenide materials according to claim 2, characterized in that, Limiting rods (501b) are fixedly connected to the front and rear ends of the outer wall of one side of the receiving disk (501), and the end of the limiting rod (501b) away from the receiving disk (501) extends to the outside of the processing box (3) and is fixedly connected to a limiting plate (501c).
4. The CNC machining tool for aspherical lenses made of chalcogenide materials according to claim 3, characterized in that, A flow guide block (501e) is fixedly connected to the bottom inner side of the receiving disk (501).
5. The CNC machining tool for aspherical lenses made of chalcogenide materials according to claim 1, characterized in that, The discharge end of the recovery pump (502a) and the inlet end of the discharge pump (502c) both extend to the inside of the oil tank (502), and the discharge pump (502c) is fixedly connected to the front and rear ends of the top of the oil tank (502).
6. The CNC machining tool for aspherical lenses made of chalcogenide materials according to claim 1, characterized in that, Mounting rods (503b) are fixedly connected to both the front and rear ends of the sleeve (503a). The end of the mounting rod (503b) away from the sleeve (503a) passes through the vertical support arm of the U-shaped frame (503) and is threadedly connected to a damping plate (503c). The damping plates (503c) are respectively attached to the vertical support arm of the U-shaped frame (503).
7. The CNC machining tool for aspherical lenses made of chalcogenide materials according to claim 1, characterized in that, Mounting bases (601a) are fixedly connected to the front and rear ends of one side outer wall of the mounting plate (601), and connecting rods (602a) are rotatably connected to the mounting bases (601a). One end of the connecting rods (602a) is fixedly connected to the front and rear end faces of the baffle plate (602), and the other end of the connecting rods (602a) is fixedly connected to the driven gears (602b). The dual-axis motor (603) is fixedly connected to the upper side outer wall of the mounting plate (601) through the motor frame (603a), and the output shaft of the dual-axis motor (603) is fixedly connected to the drive rods (603b). The end of the drive rods (603b) away from the dual-axis motor (603) is fixedly connected to the driving gears (603c), and the driving gears (603c) are meshed above the driven gears (602b).
8. A CNC machine tool for machining aspherical lenses made of chalcogenide materials according to claim 1, characterized in that, The upper surface of the mounting plate (601) is fixedly connected to the front and rear ends of the mounting plate (601), and the upper surface of the mounting plate (601c) is fixedly connected to the second hydraulic cylinder (604b). The output shaft of the second hydraulic cylinder (604b) extends to the inner side of the slide groove (601b) and is fixedly connected to the top of the slider (604a). The other side of the outer wall of the slider (604a) is fixedly connected to the third hydraulic cylinder (604c). The output shaft of the third hydraulic cylinder (604c) passes through the slider (604a) and is fixedly connected to the movable plate (604).