A laser cutting device for mechanical component production and processing

Abstract

The application provides a laser cutting equipment for mechanical part production and processing, and relates to the technical field of laser cutting equipment, which comprises a protection flap, an observation window is formed in the protection flap, a spring clamp plate is arranged below the protection flap, a spring and a limiting rod are arranged on the spring clamp plate, a work platform is arranged below the spring clamp plate, a laser cutting head is arranged below the protection flap, a cleaning scraper is arranged above the work platform, and the contact surface of the cleaning scraper with the workpiece is an oilstone. In the application, a lifting mechanism is arranged to construct a dynamic linkage mechanism of the protection flap and the work platform. When the protection flap is opened, the gear transmission system drives the rocker mechanism to move synchronously, so that the work platform is automatically turned out to the outside of the equipment along a predetermined track, and the operation mode of manually pushing and pulling the work platform is completely replaced. This design completely solves the complicated process of manually adjusting the work platform during feeding and discharging, especially for heavy workpieces.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of laser cutting equipment, more specifically, relates to a laser cutting equipment for mechanical part production and machining. BACKGROUND

[0002] In the field of mechanical part production and machining, laser cutting technology has become one of the core processes of precision manufacturing due to its high precision, non-contact processing, and small thermal deformation. It has obvious advantages in complex surface machining and micro-aperture machining, and is widely used in high-end fields such as aerospace, automobile manufacturing, and precision instruments. However, with the development of manufacturing industry towards intelligentization and flexibility, the existing equipment gradually exposes multi-dimensional technical bottlenecks in actual application.

[0003] The current laser cutting equipment at least has the following technical problems:

[0004] The protection system of the traditional laser cutting equipment is linked with the machining system, and the workbench cannot be synchronized to perform the flip-out action when the protection flap is opened. The operator needs to go through a long process of "unlocking protection, manually moving the workbench, loading and unloading, resetting the workbench, and closing the protection". For mechanical parts weighing dozens of kilograms, manual moving is not only time-consuming and labor-intensive, but also may cause workpiece collision damage or personal injury due to operation errors. Moreover, the manual intervention between multiple processes makes it difficult to match the production rhythm with the demand of automatic production line, which may cause capacity loss of the entire production line in the assembly line operation.

[0005] The workpiece positioning system of the existing equipment lacks self-adaptive adjustment mechanism. Traditional clamps mostly use fixed clamping slots or single-specification pneumatic clamps, which can only adapt to workpieces of a specific size range. When switching to small-batch multi-variety production, the clamps need to be replaced and the center point needs to be recalibrated, which may take tens of minutes, seriously affecting the efficiency of flexible production. Manual centering relies on the experience of operators. For precision parts with high symmetry requirements, manual operation errors may cause cutting trajectory deviation, increasing the scrap rate. Especially in the machining of thin-walled parts or special-shaped parts, traditional rigid clamps may cause workpiece deformation due to uneven clamping force, affecting the final size accuracy.

[0006] During the laser cutting process, the workpiece surface may be left with molten metal residues, micro-oxidation layers generated by cutting, and cutting fluid, oil stains, and dust particles left by previous processes. Most equipment only blows after cutting, which cannot pretreat the oil stains on the workpiece surface, causing harmful gases to be generated when the oil evaporates during cutting, affecting the stability of the laser beam. Traditional brushes or compressed air cannot remove stubborn oxidation films or burrs, and additional electrolytic cleaning or grinding equipment needs to be configured, increasing the cost of workshop occupation and energy consumption. Manual cleaning relies on visual inspection, which may miss hidden parts, leading to poor fit during subsequent assembly, and even causing abnormal wear during equipment operation. SUMMARY

[0007] In order to solve the above technical problems, the present application provides a laser cutting device for mechanical part production and processing to solve the above problems.

[0008] A laser cutting device for mechanical part production and processing, comprising a protective flap, an observation window is formed on the protective flap, a spring clamp plate is arranged below the protective flap, a spring and a limiting rod are arranged on the spring clamp plate, a work platform is arranged below the spring clamp plate, a laser cutting head is arranged below the protective flap, a cleaning scraper is arranged above the work platform, and the contact surface of the cleaning scraper with the workpiece is an oilstone.

[0009] A lifting mechanism is arranged below the protective flap, the lifting mechanism is used to synchronize the work platform with the protective flap when the protective flap is flipped open, a centering clamping mechanism is arranged above the work platform, the centering clamping mechanism is used to clamp the workpiece and automatically center when the work platform falls back, a cleaning mechanism is arranged above the work platform, the cleaning mechanism is used to clean the impurities and small burrs remaining on the surface of the workpiece after processing, and clean the surface of the workpiece to be processed just installed.

[0010] Preferably, the lifting mechanism comprises a device housing, a first gear is fixedly installed on the protective flap, a first gear transmission belt is engaged with the circumferential surface of the first gear, a second gear is engaged with the first gear transmission belt, a first transmission shaft is arranged on the second gear, the second gear is installed at the bottom of the device housing through the first transmission shaft, a third gear is engaged with the circumferential surface of the first transmission shaft, a second transmission shaft is fixedly installed on the third gear, a fourth gear is arranged on the second transmission shaft, a second gear transmission belt is engaged with the circumferential surface of the fourth gear, a fifth gear is engaged with the second gear transmission belt, a sixth gear is engaged with the second gear transmission belt, a third transmission shaft is fixedly installed on the fifth gear, the third transmission shaft is rotatably installed on the device housing, two first rocker arms are fixedly installed on the third transmission shaft, the other end of the first rocker arm is rotatably installed at the bottom of the work platform, a fourth transmission shaft is fixedly installed on the sixth gear, the fourth transmission shaft is rotatably installed on the device housing, a second rocker arm is fixedly installed on the fourth transmission shaft, and the second rocker arm is rotatably installed at the bottom of the work platform.

[0011] Preferably, the centering clamping mechanism comprises a first lead screw, a first helical sliding groove is formed on both sides of the first lead screw, two second lead screw nuts are arranged on the first lead screw, the second lead screw nut is internally provided with threads meshing with the first helical sliding groove, the spring clamp plate is mounted on the second lead screw nut, and the cleaning mechanism comprises a second lead screw, a second helical sliding groove is arranged on the second lead screw, a first lead screw nut is arranged on the second lead screw, the first lead screw nut is internally provided with threads meshing with the second helical sliding groove, and the cleaning scraper is mounted on the first lead screw nut.

[0012] Compared with the prior art, the present application has the following beneficial effects:

[0013] In the present application, the lifting mechanism is provided, and a dynamic linkage mechanism of the protective flap and the working platform is constructed, when the protective flap is opened, the gear transmission system drives the rocker mechanism to move synchronously, so that the working platform is automatically turned over to the outside of the equipment along a predetermined track, completely replacing the traditional manual pushing and pulling operation mode of the working platform, which completely solves the cumbersome process of manual adjustment of the working platform during feeding and discharging, especially for heavy workpieces, which can avoid collision damage and personnel fatigue caused by manual handling, significantly improve production efficiency, and reduce safety risks.

[0014] In the present application, the centering clamping mechanism is provided, and the automatic centering and elastic clamping of the workpiece are realized by using the lead screw transmission characteristics, the two-way lead screw drives two groups of spring clamp plates to move synchronously and oppositely, the workpiece can be quickly centered when the working platform falls back, and manual intervention is not required, the elastic structure of the spring clamp plate can adapt to the size change of the workpiece within a certain range, and a plurality of specifications of parts can be compatible without replacing the clamp, especially suitable for small-batch and multi-specification production scenes, which significantly shortens the machine adjustment time, and the elastic clamping force can avoid damage to the surface of the workpiece caused by the rigid clamp, and improves the clamping reliability of the precision parts.

[0015] In the present application, the cleaning mechanism is provided, and an automatic surface treatment system covering the whole cutting process is constructed, the cleaning mechanism takes the lead screw as the driving core, drives the cleaning scraper to make linear reciprocating motion along the surface of the workpiece, before cutting, the scraper quickly peels off stubborn impurities such as dust, oil stains and oxide film on the surface of the workpiece through the grinding action of the oilstone contact surface, to provide a clean base for laser cutting, after cutting, the scraper is started again to accurately clean the residual molten metal residues and fine burrs on the cutting edge, the high wear resistance and micro-cutting characteristics of the oilstone material can effectively improve the surface finish of the workpiece, the mechanism is deeply linked with the cutting process, the cleaning action is automatically triggered when the working platform returns, without manual intervention or additional equipment investment, and through the integrated structure, the workpiece is prevented from being contacted and polluted again, the machining continuity and assembly accuracy are significantly improved, and the present application is especially suitable for precision part production scenes with high surface quality requirements.

[0016] In the application, through the gear, screw rod and rocker linkage system, the cooperative control and precise cooperation of the multi-module device are realized, during the opening and closing process of the protective flap, the gear transmission chain synchronously drives the movement of the work platform, the start and stop of the clamping mechanism and the operation of the cleaning scraper, and each link realizes precise synchronization on the time axis through mechanical linkage, for example, when the protective flap is closed, the work platform returns, the workpiece clamping and surface cleaning are completed synchronously, without the need for additional control system coordination, reducing the risk of action lag or interference caused by signal delay, the linkage mechanism improves the automation degree of the machining process, reduces the manual intervention node to only the feeding and discharging link, and significantly improves the machining consistency and production efficiency.

[0017] In the application, the observation window of the protective flap is provided to provide clear and stable cutting monitoring conditions for the operator, the observation window is made of high-transmittance acrylic material and forms an integrated structure with the protective flap, which can resist the impact of splashes during cutting and maintain light transmittance for a long time, avoiding the defects of traditional glass materials that are easy to scratch and blur, the operator can observe the cutting focus position and trajectory in real time through the window, cooperate with the automatic retreat function of the laser cutting head, and can intuitively judge the cutting quality, effectively reduce the machining deviation caused by the visual blind area, the sealing design of the window strictly follows the laser safety protection standard, controls the leakage risk within the safety level, ensures the clear vision of the operator, and completely isolates the laser overflow and dust diffusion, creates a safe and reliable operation environment, especially suitable for high-precision and high-safety mechanical part machining scenes. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the application;

[0019] Figure 2 is a schematic diagram of the work platform structure of the application;

[0020] Figure 3 is a schematic diagram of the laser cutting head structure of the application;

[0021] Figure 4 is a schematic diagram of the protective flap structure of the application;

[0022] Figure 5 is a schematic diagram of the second gear structure of the application;

[0023] Figure 6 is a schematic diagram of the second rocker structure of the application;

[0024] Figure 7 is a schematic diagram of the first screw rod structure of the application;

[0025] Figure 8 is a schematic diagram of the second screw rod structure of the application;

[0026] Figure 9is a first screw nut structure schematic diagram of the present application;

[0027] Figure 10 is a second screw nut structure schematic diagram of the present application;

[0028] Figure 11 is a structure enlarged view of A of the present application Figure 9 ;

[0029] Figure 12 is a structure enlarged view of B of the present application Figure 10 .

[0030] In the figure, the corresponding relationship of component names and figure numbers is as follows: 11, protective flap; 12, device shell; 13, spring clamp plate; 14, work platform; 15, laser cutting head; 21, first gear; 22, first gear transmission belt; 23, second gear; 24, first transmission shaft; 25, third gear; 26, second transmission shaft; 27, fourth gear; 28, second gear transmission belt; 29, fifth gear; 31, sixth gear; 32, third transmission shaft; 33, first rocker; 34, fourth transmission shaft; 35, second rocker; 36, first screw rod; 38, second screw rod; 39, cleaning scraper; 41, first screw nut; 42, second screw nut; 43, first spiral chute; 44, second spiral chute. DETAILED DESCRIPTION

[0031] The embodiments of the present application will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0032] Please refer to Figures 1-12 , the present application provides a kind of laser cutting equipment of mechanical parts production and processing, including protective flap 11, protective flap 11 is opened with the observation window of acrylic plate material, protective flap 11 is used to protect the safety of staff, spring clamp plate 13 is equipped with spring and limit rod below protective flap 11, spring and limit rod on spring clamp plate 13 can provide elastic clamping force and adapt to workpiece size variation, spring clamp plate 13 can clamp different size of workpiece to be cut within a certain range, let the workpiece center and fixture center automatically align, work platform 14 is equipped with below spring clamp plate 13, work platform 14 is used to place workpiece to be cut, laser cutting head 15 is equipped with below protective flap 11, laser cutting head 15 is used to cut workpiece, after processing, laser cutting head 15 is automatically moved to rear, cleaning scraper 39 is equipped with above work platform 14, the contact surface of cleaning scraper 39 and workpiece is oilstone, work platform 14 is used to remove the small burrs on the surface of workpiece after processing and clean pollutants, can improve the smoothness of workpiece surface.

[0033] The lifting mechanism is arranged below the protection flap 11, and is used for synchronously turning out the work platform 14 when the protection flap 11 is turned open, so as to facilitate the taking and installation of the workpiece. The centering clamping mechanism is arranged above the work platform 14, and is used for clamping the workpiece and automatically centering when the work platform 14 falls back, and can be compatible with workpieces of different sizes within a certain range. The cleaning mechanism is arranged above the work platform 14, and is used for cleaning the impurities and small burrs remaining on the surface of the workpiece after machining, and cleaning the surface of the workpiece to be machined just installed, and removing the dust, oil stains or oxide film carried by the workpiece.

[0034] In the embodiment, as shown in Figure 3 、 Figure 4 、 Figure 5 and Figure 6As shown, the lifting mechanism includes a device housing 12, the first gear 21 is fixedly installed on the protective flap 11, the first gear 21 is engaged with the first gear transmission belt 22, the first gear transmission belt 22 is engaged with the second gear 23, the first transmission shaft 24 is arranged on the second gear 23, the second gear 23 is installed on the bottom of the device housing 12 through the first transmission shaft 24, the third gear 25 is engaged with the circumference of the first transmission shaft 24, the second transmission shaft 26 is fixedly installed on the third gear 25, the first gear 21 and the second gear 23 are driven to rotate counterclockwise when the protective flap 11 is opened, the second transmission shaft 26 is driven to rotate counterclockwise through the engagement of the second gear 23 and the third gear 25, the fourth gear 27 is arranged on the second transmission shaft 26, the second gear transmission belt 28 is engaged with the circumference of the fourth gear 27, the fifth gear 29 is engaged with the second gear transmission belt 28, the sixth gear 31 is engaged with the second gear transmission belt 28, the second gear transmission belt 28 drives the fifth gear 29 to rotate synchronously with the third transmission shaft 32 when the fourth gear 27 rotates, the third transmission shaft 32 is fixedly installed on the fifth gear 29, the third transmission shaft 32 is rotatably installed on the device housing 12, two first rocker arms 33 are fixedly installed on the third transmission shaft 32, the other end of the first rocker arm 33 is rotatably installed on the bottom of the workbench 14, the fourth transmission shaft 34 is fixedly installed on the sixth gear 31, the fourth transmission shaft 34 is rotatably installed on the device housing 12, the second rocker arm 35 is fixedly installed on the fourth transmission shaft 34, the second rocker arm 35 is rotatably installed on the bottom of the workbench 14, the fourth transmission shaft 34 and the second rocker arm 35 are driven to rotate by the sixth gear 31 when the fourth gear 27 drives the fifth gear 29 and the sixth gear 31 to rotate, the third transmission shaft 32 and the first rocker arm 33 are driven to rotate by the fifth gear 29 when the fifth gear 29 rotates, the workbench 14 is lifted to the outside of the device housing 12 by the rotation of the first rocker arm 33 and the second rocker arm 35, which facilitates the taking out of the workpiece and the placing of the workpiece to be cut on the workbench 14, the first gear 21 drives the first gear transmission belt 22 and the first transmission shaft 24 to rotate synchronously counterclockwise when the protective flap 11 is closed, the third gear 25, the second transmission shaft 26 and the fourth gear 27 are driven to rotate clockwise by the engagement of the second transmission shaft 26, the sixth gear 31 and the fifth gear 29 are driven to rotate synchronously by the engagement of the second gear transmission belt 28 and the fourth gear 27, the first rocker arm 33 and the second rocker arm 35 are driven to rotate by the sixth gear 31 and the fifth gear 29, so that the workbench 14 moves along a certain trajectory and returns to the inside of the device housing 12.

[0035] In this embodiment, as Figure 8 , Figure 10 and Figure 11As shown, the centering and clamping mechanism includes a first screw rod 36, a first screw groove 43 is formed on both sides of the first screw rod 36, the two first screw grooves 43 are symmetrical with the center point of the first screw rod 36, a second screw rod nut 42 is arranged on the first screw rod 36, the second screw rod nut 42 is internally provided with a thread engaged with the first screw groove 43, and the spring clamp plate 13 is mounted on the second screw rod nut 42. When the protective flap 11 is closed, the second rocker 35 is rotated to drive the first screw rod 36 to rotate, and under the action of the first screw groove 43, the second screw rod nut 42 drives the two groups of spring clamp plates 13 to move relatively, thereby centering and clamping the workpiece to be cut. At the same time, the spring on the spring clamp plate 13 can prevent the surface of the workpiece from being scratched and can adapt to workpieces of different sizes. When the protective flap 11 is opened, the second screw rod nut 42 drives the two groups of spring clamp plates 13 to move to both sides under the action of the thread groove formed on the first screw rod 36, thereby releasing the clamping of the workpiece, which facilitates the disassembly of the workpiece.

[0036] In this embodiment, as shown in Figure 6 、 Figure 8 、 Figure 9 and Figure 11 , the cleaning mechanism includes a second screw rod 38, a second screw groove 44 is formed on the second screw rod 38, a first screw rod nut 41 is arranged on the second screw rod 38, the first screw rod nut 41 is internally provided with a thread engaged with the second screw groove 44, and a cleaning scraper 39 is mounted on the first screw rod nut 41. When the first rocker 33 drives the second screw rod 38 to rotate, the first screw rod nut 41 drives the cleaning scraper 39 to move horizontally under the action of the second screw groove 44, and the cleaning scraper 39 moves to clean the surface of the workpiece on the work platform 14.

[0037] Working principle:

[0038] The first step, the staff will start the device, check the device after opening to open the protective flap 11, at this time the protective flap 11 is opened to drive the first gear 21 counterclockwise rotation, the first gear 21 through the mesh drive second gear 23 synchronous rotation, the second gear 23 through the mesh drive third gear 25 counterclockwise rotation, the third gear 25 drive installed on its second transmission shaft 26 and fourth gear 27 counterclockwise rotation, because the fourth gear 27, fifth gear 29 and sixth gear 31 are engaged in the second gear transmission belt 28, fourth gear 27 counterclockwise rotation drive sixth gear 31 and fifth gear 29 also counterclockwise rotation, because the fourth transmission shaft 34 is fixedly installed on the sixth gear 31, the sixth gear 31 drive fourth transmission shaft 34 and second rocker 35 synchronous counterclockwise rotation, because the third transmission shaft 32 is fixedly installed on the first rocker 33, fifth gear 29 drive third transmission shaft 32 and first rocker 33 counterclockwise rotation, the first rocker 33 and second rocker 35 counterclockwise rotation drive work platform 14 to move to a certain path outside the device shell 12, at this time the staff can more conveniently operate on the work platform 14, while the work platform 14 moves outward, the second rocker 35 drive first screw rod 36 counterclockwise rotation, two groups of second screw rod nut 42 installed on the first screw rod 36 under the action of two groups of screw groove on the first screw rod 36, drive two groups of spring clamp plate 13 to move outward simultaneously, the clamping of the workpiece is released, at the same time, the first rocker 33 counterclockwise rotation drive second screw rod 38 rotation, the first screw rod nut 41 moves to the other side under the action of the second spiral slide 44, the workpiece is cleaned.

[0039] The second step, the staff checks the workpiece to be cut, places the workpiece on the work platform 14, and then pulls down the protective flap 11, the protective flap 11 drives the first gear 21 clockwise rotation, the first gear 21 through the mesh drive second gear 23 synchronous rotation, the second gear 23 through the mesh drive third gear 25 clockwise rotation, the third gear 25 drive installed on its second transmission shaft 26 and fourth gear 27 clockwise rotation, because the fourth gear 27, fifth gear 29 and sixth gear 31 are engaged in the second gear transmission belt 28, fourth gear 27 clockwise rotation drive sixth gear 31 and fifth gear 29 also clockwise rotation, because the fourth transmission shaft 34 is fixedly installed on the sixth gear 31, the sixth gear 31 drive fourth transmission shaft 34 and second rocker 35 clockwise rotation, because the third transmission shaft 32 is fixedly installed on the first rocker 33, fifth gear 29 drive third transmission shaft 32 and first rocker 33 clockwise rotation, the first rocker 33 and second rocker 35 clockwise rotation drive work platform 14 to move to the same path inside the device shell 12, realize the automatic reset convenient operation of the staff.

[0040] Third step, while moving the work platform 14, the second rocker 35 drives the first screw rod 36 to rotate clockwise, two groups of second screw rod nuts 42 installed on the first screw rod 36 are driven to move inward by the first screw chute 43, and two groups of spring clamping plates 13 are simultaneously moved to clamp the workpiece placed on the work platform 14, at the same time, the first rocker 33 drives the second screw rod 38 to rotate clockwise, and the first screw rod nut 41 moves to the other side under the action of the threaded groove on the second screw rod 38, so as to clean the surface of the workpiece to be processed, and then the device laser cutting head 15 starts to cut the workpiece.

[0041] Fourth step, after cutting, the laser cutting head 15 automatically moves backward, the first rocker 33 drives the second screw rod 38 to rotate, and the first screw rod nut 41 drives the cleaning scraper 39 to move horizontally under the action of the threaded groove on the second screw rod 38, so as to clean the surface of the workpiece on the work platform 14, remove the small burrs and pollutants on the surface of the workpiece after processing; when the protective flap 11 is opened again, the first step is repeated, the work platform 14 is turned out, and the clamping mechanism is loosened, so that the operator can take out the finished product and enter the next processing cycle.

[0042] Embodiments of the present application are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the application to the disclosed form. Many modifications and variations will be apparent to those of ordinary skill in the art. Embodiments are chosen and described in order to best explain the principles of the application and its practical application, and to enable others skilled in the art to understand the application for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. A laser cutting device for manufacturing and processing mechanical parts, comprising a protective flap (11), characterized in that: The protective flap (11) is provided with an observation window. A spring clamp (13) is provided below the protective flap (11). A spring and a limiting rod are provided on the spring clamp (13). A working platform (14) is provided below the spring clamp (13). A laser cutting head (15) is provided below the protective flap (11). A cleaning scraper (39) is provided above the working platform (14). The contact surface between the cleaning scraper (39) and the workpiece is an oilstone. The protective flap (11) is provided with a lifting mechanism below it. The lifting mechanism is used to enable the working platform (14) to flip out synchronously when the protective flap (11) is flipped open. The working platform (14) is provided with a centering clamping mechanism above it. The centering clamping mechanism is used to clamp the workpiece and automatically center it when the working platform (14) falls back. The working platform (14) is provided with a cleaning mechanism above it. The cleaning mechanism is used to clean the impurities and small burrs remaining on the surface of the workpiece after processing, as well as to clean the surface of the workpiece to be processed that has just been installed. The centering clamping mechanism includes a first lead screw (36), with first spiral grooves (43) on both sides of the first lead screw (36), and two second lead screw nuts (42) on the first lead screw (36). The second lead screw nuts (42) have threads that mesh with the first spiral grooves (43), and the spring clamp (13) is installed on the second lead screw nuts (42). The cleaning mechanism includes a second lead screw (38), a second spiral groove (44) on the second lead screw (38), a first lead screw nut (41) on the second lead screw (38), and a thread on the first lead screw nut (41) that engages with the second spiral groove (44). The cleaning scraper (39) is mounted on the first lead screw nut (41). The lifting mechanism includes a device housing (12), a first gear (21) fixedly mounted on the protective flap (11), a first gear transmission belt (22) meshing with the circumferential surface of the first gear (21), a second gear (23) meshing with the first gear transmission belt (22), a first transmission shaft (24) provided on the second gear (23), the second gear (23) being mounted on the bottom of the device housing (12) via the first transmission shaft (24), a third gear (25) meshing with the circumferential surface of the first transmission shaft (24), a second transmission shaft (26) fixedly mounted on the third gear (25), a fourth gear (27) provided on the second transmission shaft (26), and a second gear transmission belt (28) meshing with the circumferential surface of the fourth gear (27). A fifth gear (29) meshes on the second gear transmission belt (28), and a sixth gear (31) meshes on the second gear transmission belt (28). A third transmission shaft (32) is fixedly installed on the fifth gear (29). The third transmission shaft (32) is rotatably installed on the device housing (12). Two first rockers (33) are fixedly installed on the third transmission shaft (32). The other end of the first rocker (33) is rotatably installed on the bottom of the work platform (14). A fourth transmission shaft (34) is fixedly installed on the sixth gear (31). The fourth transmission shaft (34) is rotatably installed on the device housing (12). A second rocker (35) is fixedly installed on the fourth transmission shaft (34). The second rocker (35) is rotatably installed on the bottom of the work platform (14).

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