Optical lens double-sided polishing device

Abstract

The invention relates to the technical field of lens polishing, in particular to an optical lens double-face polishing device which comprises a machine box, a driving assembly A, a sliding frame, a transmission shaft, a transmission assembly, a driving assembly C, a sliding block and a driving assembly D. A fixed seat is arranged in the case, a sliding rod is arranged on the fixed seat, the sliding rod is connected with a supporting wheel A and a push plate, two crank arms are rotationally arranged on the fixed seat, and supporting wheels B and rollers are arranged on the crank arms; the driving assembly A drives the sliding rod to slide; the sliding frame is arranged in the machine box in a sliding mode, and a spraying assembly is arranged on the sliding frame. The two transmission shafts are rotationally arranged on the sliding frame, and the driving wheels and the polishing rollers are arranged on the transmission shafts on the two sides correspondingly. The transmission assembly is in transmission connection with the two transmission shafts; the driving component C is in driving connection with the transmission shaft; the two sliding blocks are symmetrically arranged on the sliding frame in a sliding mode, and a grinding belt A is arranged on the sliding blocks; the driving assembly D is in driving connection with the sliding blocks on the two sides. The lens polishing device can quickly clamp, position and polish a lens in all directions, and is suitable for lenses with different diameters.

Description

Technical Field

[0001] The present invention relates to the technical field of lens polishing, and particularly to a double-sided polishing device for optical lenses. Background Art

[0002] When processing optical lenses, polishing treatment is required. Polishing can significantly improve the light transmittance of optical lenses. Through precise polishing, the defects and irregular reflections on the lens surface can be reduced, thereby improving the light transmittance and imaging clarity of the lens. The polished lens surface is smoother, which can reduce light scattering and improve the utilization rate of light. In processes such as edge grinding and lapping, thick crack layers or other defects may be generated on the lens surface. The polishing process can eliminate these defects and make the lens surface more flat and smooth.

[0003] Chinese Patent with the authorization announcement number CN221111138U discloses a double-sided polishing device for optical lenses. This device clamps and fixes the lens through the matching structure of two groups of screws and fixing clamps, and then polishes the two end faces of the lens through two groups of upper and lower polishing sheets. And this device avoids the influence of debris on the polishing environment and the harm to the human body, and also facilitates the collection of debris.

[0004] However, this device still has deficiencies: this device lacks a structure for automatically switching the clamping points of the lens. During the polishing process of the lens, the area covered by the fixed price needs to be polished after manually adjusting the clamping points, and the operations of clamping and fixing the lens and taking it out are both troublesome. Summary of the Invention

[0005] The object of the present invention is to propose a double-sided polishing device for optical lenses in view of the problems existing in the background art.

[0006] The technical solution of the present invention: A double-sided polishing device for optical lenses includes a chassis. A fixed seat is arranged inside the chassis. A through hole is arranged on the fixed seat. A sliding rod is slidably arranged in the through hole. The sliding rod is rotatably connected to a support wheel A. The sliding rod is connected to a push plate. Two curved surfaces are symmetrically arranged on the push plate. And two crank arms rotatably connected to the fixed seat are symmetrically arranged about the axis of the rotation shaft of the support wheel A in the through hole. A support wheel B and a roller are respectively arranged at both ends of the crank arm. The roller is in rolling contact with the corresponding curved surface;

[0007] A driving component A is arranged in the through hole and drives the sliding rod to slide. And when the sliding rod is in the upward sliding state, the two support wheels B on both sides approach synchronously;

[0008] A sliding frame is slidably arranged in the chassis. A driving component B for driving the sliding frame to rise or fall is arranged inside the chassis. And a spraying component is arranged in the middle of the sliding frame;

[0009] The drive shaft, two drive shafts are symmetrically arranged about the center of the support wheel A on the carriage and are rotatably connected to the carriage. The drive wheels and the polishing rollers are coaxially arranged on the drive shafts on both sides respectively;

[0010] The transmission assembly, the transmission assembly is drivingly connected to the two drive shafts;

[0011] The driving assembly C, the driving assembly C is arranged on the carriage and drives the two drive shafts to rotate, and the driving wheels and the polishing rollers rotate in opposite directions;

[0012] The slider, two sliders are symmetrically and slidably arranged on the carriage, and the grinding belt A is arranged on the slider;

[0013] And the driving assembly D, the driving assembly D is arranged on the carriage and drives the sliders on both sides to move away from or close to each other.

[0014] Preferably, a door opening is provided on the chassis, a door for controlling the opening and closing of the door opening is rotatably arranged on the chassis, and a drain pipe communicating with the inside thereof is arranged at the bottom of the chassis.

[0015] Preferably, a fixing block is arranged in the through hole, a limiting hole is arranged on the fixing block, and the sliding rod passes through the limiting hole and is slidably connected to its inner wall.

[0016] Preferably, the curved surface of the push plate is a G3 curvature continuous surface.

[0017] Preferably, two rotating shafts are symmetrically arranged in the through hole. A shaft hole is arranged on the crank arm between the support wheel B and the roller. The rotating shafts on both sides are respectively inserted into the shaft holes on the corresponding side crank arms and are rotatably connected thereto. Two electromagnets are symmetrically arranged on the inner wall of the through hole. Iron sheets are arranged on the crank arm between the rotating shaft and the support wheel B. The iron sheets on the two crank arms on both sides are magnetically attracted and matched with the electromagnets on the corresponding sides respectively.

[0018] Preferably, the spraying assembly includes a water guide pipe and a water inlet pipe. The water guide pipe is arranged on the carriage, the water guide pipe penetrates through the carriage, and the outlet of the water guide pipe is located between the driving wheel and the polishing roller. One end of the water inlet pipe is inserted into the water guide pipe.

[0019] Preferably, the driving assembly D includes a cylinder C; two sliding grooves are symmetrically arranged on the carriage about the center of the water guide pipe. The two sliders are respectively inserted into the sliding grooves on the corresponding sides and are slidably connected thereto. The drive shaft penetrates through the sliders on both sides and is slidably connected thereto. A rack is arranged on one side of the two sliders close to each other. The tooth grooves of the two racks are opposite. An external toothed ring is coaxially rotatably arranged on the water guide pipe. The external toothed ring is located between the two racks and meshes with both racks. The body of the cylinder C is connected to the carriage, and the output end of the cylinder C is connected to one of the sliders.

[0020] Preferably, the transmission assembly includes a large gear and a small gear. The large gear is coaxially connected to the transmission shaft where the driving wheel is located, the small gear is coaxially connected to the transmission shaft where the polishing roller is located, and the large gear is meshed with the small gear.

[0021] Preferably, a mounting plate is arranged on the slider. The grinding belt A is arranged on the mounting plate, and a guide rod slidably connected thereto is arranged on the mounting plate. One end of the guide rod extending out of the mounting plate is connected to a movable plate. A grinding belt B parallel to the grinding belt A is arranged on the movable plate, and a cylinder D is arranged on the mounting plate. The output end of the cylinder D is connected to the movable plate.

[0022] Compared with the prior art, the present invention has the following beneficial technical effects:

[0023] By providing a fixed seat, a sliding rod and a crank arm are arranged on the fixed seat, a supporting wheel A and a pushing plate are arranged on the sliding rod, a roller and a supporting wheel B are arranged on the crank arm, and the pushing plate is pushed to slide by cooperating with a cylinder, so as to realize the synchronous approach or separation of the supporting wheel A and the supporting wheel B, and further facilitate the quick clamping and positioning of lenses with different diameters, and there is a grinding and polishing window with a fixed orientation after positioning; by providing a driving wheel and a polishing roller, the driving wheel and the polishing roller are linked by a large gear and a small gear, so that while the driving wheel propels the lens to rotate slowly, the polishing roller rotates at a high speed in the reverse direction and polishes the edge of the lens; by providing grinding belts with adjustable spacing, it is convenient to polish the two end faces of optical lenses with different thicknesses and diameters synchronously. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of an embodiment of the present invention;

[0025] Figure 2 It is a schematic connection structure diagram of each component on the fixed seat;

[0026] Figure 3 It is a schematic internal structure diagram of the fixed seat;

[0027] Figure 4 It is a schematic connection structure diagram of each component on the carriage;

[0028] Figure 5 It is a schematic connection structure diagram of the slider and the transmission shaft;

[0029] Figure 6 It is a schematic connection structure diagram of each component on the slider.

[0030] Reference numerals: 1, chassis; 2, cabinet door; 3, drain pipe; 4, fixing seat; 41, through hole; 5, fixing block; 6, sliding rod; 7, supporting wheel A; 8, push plate; 81, waterproof plate; 9, cylinder A; 10, pressure sensor; 11, crank arm; 12, supporting wheel B; 13, roller; 14, iron sheet; 15, electromagnet; 16, sliding frame; 161, chute; 17, fixing plate; 18, cylinder B; 19, transmission shaft; 20, transmission assembly; 21, driving wheel; 22, polishing roller; 23, motor; 24, slider; 25, rack; 26, water guide pipe; 261, water inlet pipe; 27, external tooth ring; 28, cylinder C; 29, mounting plate; 30, grinding belt A; 31, movable plate; 32, grinding belt B; 33, cylinder D. Detailed implementation mode

[0031] Embodiment 1

[0032] Such as Figures 1 - 5As shown, a double-sided polishing device for optical lenses proposed by the present invention comprises a chassis 1, a driving assembly A, a slide 16, a transmission shaft 19, a transmission assembly 20, a driving assembly C, a slider 24 and a driving assembly D. A door opening is arranged on the chassis 1, a door 2 for controlling the door opening is rotatably arranged on the chassis 1, and a drainage pipe 3 communicating with the interior of the chassis 1 is arranged at the bottom of the chassis 1. A fixing seat 4 is arranged inside the chassis 1, a through hole 41 is arranged on the fixing seat 4, a slide rod 6 is slidably arranged in the through hole 41, a fixing block 5 is arranged in the through hole 41, a limiting hole is arranged on the fixing block 5, and the slide rod 6 passes through the limiting hole and is slidably connected with the inner wall thereof. The slide bar 6 is rotatably connected to the support wheel A7, and the slide bar 6 is connected to the push plate 8. Two curved surfaces are symmetrically arranged on the push plate 8. The curved surface of the push plate 8 is a G3 curvature continuous curved surface, and two crank arms 11 rotatably connected to the fixed seat 4 are symmetrically arranged about the axis of the rotation axis of the support wheel A7 in the through hole 41. The two ends of the crank arm 11 are respectively provided with a support wheel B12 and a roller 13, and the roller 13 is in rolling contact with the curved surface on the corresponding side. Two rotating shafts are symmetrically arranged in the through hole 41, and an axial hole is arranged on the crank arm 11 between the support wheel B12 and the roller 13. The rotating shafts on both sides are respectively inserted into the axial holes on the corresponding side crank arm 11 and are rotatably connected thereto. The driving component A includes but is not limited to the cylinder A9, the pressure sensor 10 and the controller. The controller is arranged on the chassis 1, and the pressure sensor 10 and the cylinder A9 are both electrically connected to the controller. The body of the cylinder A9 is arranged in the through hole 41, the pressure sensor 10 is located between the push plate 8 and the output end of the cylinder A9, and the output end of the cylinder A9 is connected to the body of the pressure sensor 10, and the detection end of the pressure sensor 10 is connected to the push plate 8. At the same time, two waterproof plates 81 are symmetrically arranged on the push plate 8, and the waterproof plates 81 are slidably connected to the inner wall of the through hole 41. The two waterproof plates 81 are respectively located on both sides of the body of the cylinder A9. The slide 16 is slidably arranged in the chassis 1, and a driving component B for driving the slide 16 to rise or fall is arranged in the chassis 1. The driving component B includes but is not limited to the cylinder B18; a fixed plate 17 is arranged in the chassis 1, and the body of the cylinder B18 is arranged on the fixed plate 17. The output end of the cylinder B18 is connected to the slide 16, and a spray component is centrally arranged on the slide 16. The spray component includes a water pipe 26 and a water inlet pipe 261. The water pipe 26 is arranged on the slide 16, and the water pipe 26 runs through the slide 16. Two transmission shafts 19 are symmetrically arranged on the carriage 16 about the center of the support wheel A7 and are rotatably connected with the carriage 16. The driving wheels 21 and the polishing rollers 22 are coaxially arranged on the transmission shafts 19 on both sides, respectively. The driving wheels 21 and the polishing rollers 22 are symmetrical about the rotation axis of the support wheel B12. The outlet of the water guide pipe 26 is located between the driving wheels 21 and the polishing rollers 22, and one end of the water inlet pipe 261 is inserted into the water guide pipe 26. The transmission assembly 20 includes a large gear and a small gear. The large gear is coaxially connected to the transmission shaft 19 where the driving wheel 21 is located, and the small gear is coaxially connected to the transmission shaft 19 where the polishing roller 22 is located. The large gear is meshed with the small gear, and the transmission assembly 20 is transmission-connected to the two transmission shafts 19.The driving assembly C includes, but is not limited to, the motor 23. The body of the motor 23 is arranged on the carriage 16, and the output end of the motor is connected to one of the transmission shafts 19. Two sliders 24 are symmetrically and slidably arranged on the carriage 16, and a grinding belt A30 is arranged on the slider 24. The driving assembly D is arranged on the carriage 16 and drives the two sliders 24 on both sides to move away from or close to each other. The driving assembly D includes a cylinder C28. Two chutes 161 are symmetrically arranged on the carriage 16 with respect to the center of the water guide pipe 26. The two sliders 24 are respectively inserted into the corresponding chutes 161 on both sides and are slidably connected thereto. The transmission shaft 19 passes through the two sliders 24 on both sides and is slidably connected thereto. A rack 25 is arranged on one side of the two sliders 24 close to each other. The tooth grooves of the two racks 25 on both sides are opposite, and an external tooth ring 27 is rotatably arranged coaxially on the water guide pipe 26. The external tooth ring 27 is located between the two racks 25 on both sides and meshes with both racks 25. The body of the cylinder C28 is connected to the carriage 16, and the output end of the cylinder C28 is connected to one of the sliders 24.

[0033] In this embodiment, since the curved surface of the push plate 8 is set as a G3 curvature continuous surface, when the cylinder A9 pushes the supporting wheel A7 to slide upward (see Figure 2 as shown), by squeezing the rollers 13 on both sides, the two supporting wheels B12 on both sides are synchronously close to each other, and the central heights of the supporting wheel A7 and the two supporting wheels B12 on both sides are kept unchanged. At the same time, it can also ensure that the clamping part of the supporting wheel B12 and the lens is located in the upper half of the center of the lens, so as to effectively wrap and fix the lens. This structure is different from the traditional centering clamping mechanism. During actual operation, the two supporting wheels B12 on both sides are in the state of the maximum distance, and the supporting wheel A7 is in the low position. When the lens is placed on the supporting wheel A7, the pressure sensor 10 will detect the pressure value, and the cylinder A9 will be automatically started and push the push plate 8 and the slide bar 6 to slide, so that the two rollers 13 on both sides are smoothly moved away from each other by using the G3 curvature continuous surface, and then the lens is clamped and fixed by the cooperative operation of the supporting wheel A7 and the supporting wheel B12. When the pressure sensor 10 detects that the pressure value reaches the set parameter of the clamping force, it will automatically stop working. After polishing, pulling up the lens will cause the roller 13 to generate a downward pressure on the push plate 8. At this time, the pressure sensor will change, so as to obtain the signal for releasing the lens. The cylinder A9 pulls back the push plate 8 and widens the distance between the two supporting wheels B12 on both sides, and the lens can be directly taken out. Using this structure, the rapid clamping and fixing and taking-out operations of the lens are realized. This structure has a fast response speed and stable clamping.

[0034] The specific operation steps of this embodiment are as follows:

[0035] S1. Place the lens on the supporting wheel A7, start the cylinder A9, use the cylinder A9 to push the push plate 8 and the supporting wheel A7 to slide, and then drive the two supporting wheels B12 on both sides and the supporting wheel A7 to approach synchronously and clamp the lens;

[0036] S2. Start cylinder B18, lower the carriage 16 by cylinder B18 until both the driving wheel 21 and the grinding roller 22 are in contact with the upper edge of the lens. At the same time, start cylinder C28. Cylinder C28 drives the slider 24 on one side to slide, and drives the slider 24 on the other side to slide synchronously through the transmission of the rack 25 and the external gear ring 27. The two sliders 24 approach each other until the grinding belts A30 on both sides are in contact with both sides of the lens respectively.

[0037] S3. Connect the water inlet pipe 261 to an external water supply pipe. The external water supply pipe provides polishing liquid. The polishing liquid flows down along the water guide pipe 26 and falls between the driving wheel 21, the polishing roller 22 and the grinding belts A30 on both sides. At this time, start the motor 23. The motor 23 drives the driving wheel 21 to rotate slowly in the forward direction. The driving wheel 21 drives the lens to rotate slowly in the forward direction. At this time, under the transmission of the large gear and the small gear, the polishing roller 22 rotates at a high speed along the opposite direction of the driving wheel 21, so as to quickly polish the edge part of the lens. At the same time, the grinding belts A30 on both sides polish the two end faces of the lens.

[0038] S4. After polishing is completed, the carriage 16 and the slider 24 return to their original positions. Cylinder A9 pulls down the supporting wheel A7 so that the supporting wheels B12 on both sides are in a loose state, and the lens is directly picked up and taken down.

[0039] Embodiment 2

[0040] As Figure 5 and Figure 6 shown, an optical lens double-sided polishing device proposed by the present invention. Compared with Embodiment 1, an installation plate 29 is provided on the slider 24. The grinding belt A30 is arranged on the installation plate 29, and a guide rod slidably connected thereto is arranged on the installation plate 29. One end of the guide rod extending out of the installation plate 29 is connected to a movable plate 31. A grinding belt B32 parallel to the grinding belt A30 is arranged on the movable plate 31, and a cylinder D33 is arranged on the installation plate 29. The output end of the cylinder D33 is connected to the movable plate 31.

[0041] In this embodiment, for lenses with different diameters, when ensuring that both the driving wheel 21 and the polishing roller 22 are in contact with the lens edge, grinding belts of different lengths are required. At this time, the movable plate 31 can be driven to slide by the cylinder D33. The grinding belt B32 on the movable plate 31 can cooperate with the grinding belt A30 to realize the adjustment of the entire grinding belt in length to adapt to the polishing of lenses with different diameters.

[0042] Embodiment 3

[0043] As Figure 3As shown in the figure, an optical lens double-sided polishing device proposed by the present invention, compared with Embodiment 1, symmetrically arranges two electromagnets 15 on the inner wall of the through hole 41, and arranges iron sheets 14 between the rotating shaft and the support wheel B12 on the crank arm. The iron sheets 14 on the two crank arms 11 are respectively magnetically attracted and matched with the corresponding electromagnets 15 on each side.

[0044] In this embodiment, when the cylinder A9 pulls down the push plate 8, the electromagnet 15 is energized and generates a suction force on the iron sheet 14, so that the crank arm 11 automatically rotates under the action of the magnetic suction force, facilitating the next processing of the lens. When the support wheel B12 and the support wheel A7 clamp the lens, the electromagnet 15 is not energized to avoid the adsorption of ferromagnetic materials on the electromagnet during the polishing process.

[0045] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those skilled in the art.

Claims

1. A double-sided polishing device for an optical lens, characterized in that: include: A chassis (1), a fixed seat (4) is arranged in the chassis (1), a through hole (41) is arranged on the fixed seat (4), a sliding rod (6) is slidably arranged in the through hole (41), the sliding rod (6) is rotatably connected to the support wheel A (7), the sliding rod (6) is connected to the push plate (8), two curved surfaces are symmetrically arranged on the push plate (8), and two crank arms (11) rotatably connected to the fixed seat (4) are symmetrically arranged in the through hole (41) about the axis of the rotation axis of the support wheel A (7), and the two ends of the crank arm (11) are respectively arranged with a support wheel B (12) and a roller (13), and the roller (13) is in rolling contact with the curved surface on the corresponding side; A driving assembly A is arranged in the through hole (41) and drives the slide bar (6) to slide, and the supporting wheels B (12) on both sides of the slide bar (6) are synchronously approached when the slide bar (6) is in an upward sliding state; A slide (16), the slide (16) is slidably arranged in the chassis (1), a driving component B for driving the slide (16) to rise or fall is arranged in the chassis (1), and a spray component is centrally arranged on the slide (16); Transmission shafts (19), two transmission shafts (19) are symmetrically arranged on the carriage (16) about the center of the support wheel A (7) and are rotatably connected to the carriage (16), and a driving wheel (21) and a polishing roller (22) are coaxially arranged on the transmission shafts (19) on both sides; A transmission assembly (20), the transmission assembly (20) is transmission-connected to the two transmission shafts (19); A driving assembly C, which is arranged on the carriage (16) and drives the two transmission shafts to rotate, and the driving wheel (21) and the polishing roller (22) rotate in opposite directions; Slide blocks (24), two slide blocks (24) are symmetrically and slidably arranged on the slide frame (16), and a grinding belt A (30) is arranged on the slide blocks (24); And a driving component D, which is arranged on the slide frame (16) and drives the slide blocks (24) on both sides to move away from or towards each other.

2. The double-sided polishing device for an optical lens according to claim 1, characterized in that: A door opening is arranged on the chassis (1), a cabinet door (2) is rotatably arranged on the chassis (1) for controlling the opening and closing of the door opening, and a drainage pipe (3) communicating with the interior of the chassis (1) is arranged at the bottom of the chassis (1).

3. The double-sided polishing device for optical lenses according to claim 1, characterized in that: A fixing block (5) is arranged in the through hole (41), a limiting hole is arranged on the fixing block (5), and a sliding rod (6) passes through the limiting hole and is slidably connected with the inner wall thereof.

4. The double-sided polishing device for optical lenses according to claim 1, characterized in that: The curved surface of the push plate (8) is a continuous curved surface with a G3 curvature.

5. The double-sided polishing device for optical lenses according to claim 1, characterized in that: Two rotating shafts are symmetrically arranged in the through hole (41); an axial hole is arranged on the crank arm (11) between the supporting wheel B (12) and the roller (13); the rotating shafts on both sides are respectively inserted into the axial holes on the crank arm (11) on the corresponding side and are rotatably connected thereto; two electromagnets (15) are symmetrically arranged on the inner wall of the through hole (41); an iron sheet (14) is arranged on the crank arm between the rotating shaft and the supporting wheel B (12); and the iron sheets (14) on the crank arms (11) on both sides are respectively magnetically matched with the electromagnets (15) on the corresponding side.

6. The double-sided polishing device for optical lenses according to claim 1, characterized in that: The spray assembly comprises a water pipe (26) and a water inlet pipe (261), wherein the water pipe (26) is arranged on the slide (16), the water pipe (26) penetrates the slide (16), and the outlet of the water pipe (26) is located between the driving wheel (21) and the polishing roller (22), and one end of the water inlet pipe (261) is inserted into the water pipe (26).

7. The double-sided polishing device for an optical lens according to claim 6, characterized in that: The driving assembly D comprises a cylinder C (28); two slide grooves (161) are symmetrically arranged on the slide frame (16) about the center of the water pipe (26); two sliders (24) are respectively inserted into the slide grooves (161) on the corresponding sides and are slidably connected thereto; a transmission shaft (19) passes through the sliders (24) on both sides and is slidably connected thereto; a rack (25) is respectively arranged on the side where the sliders (24) on both sides are close to each other; the tooth grooves of the racks (25) on both sides are opposite; an outer tooth ring (27) is coaxially rotatably arranged on the water pipe (26); the outer tooth ring (27) is located between the racks (25) on both sides and meshes with the racks (25) on both sides; the body of the cylinder C (28) is connected to the slide frame (16); and the output end of the cylinder C (28) is connected to one of the sliders (24).

8. The double-sided polishing device for an optical lens according to claim 1, characterized in that: The transmission assembly (20) comprises a large gear and a small gear, wherein the large gear is coaxially connected to a transmission shaft (19) where the driving wheel (21) is located, and the small gear is coaxially connected to the transmission shaft (19) where the polishing roller (22) is located, and the large gear is meshingly connected with the small gear.

9. The double-sided polishing device for optical lenses according to claim 1, characterized in that: A mounting plate (29) is arranged on the slider (24), a grinding belt A (30) is arranged on the mounting plate (29), a guide rod slidably connected to the mounting plate (29) is arranged on the mounting plate (29), one end of the guide rod extending out of the mounting plate (29) is connected to a movable plate (31), a grinding belt B (32) parallel to the grinding belt A (30) is arranged on the movable plate (31), and a cylinder D (33) is arranged on the mounting plate (29), an output end of the cylinder D (33) is connected to the movable plate (31).

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