CN110466949A - A kind of upper and lower pieces auxiliary device of large scale special-shaped workpiece - Google Patents

Abstract

The invention relates to an auxiliary device for upper and lower parts of large-scale special-shaped workpieces, which integrates three functions of lifting, translation and accompanying posture correction, and consists of a hydraulic lifting platform (1), a horizontal moving platform (4) and a traveling posture correction platform (6) It consists of three parts. The horizontal moving platform (4) is supported on the hydraulic lifting platform (1) through the moving track (2), and is driven by a transmission chain (15). The accompanying posture correction platform (6) is placed on the unpowered accompanying roller table (5) on the horizontal moving platform (4), and the workpiece (7) is directly placed on the accompanying posture correction platform (6). 5) The posture of the upper part is automatically adjusted according to the change of the center of gravity of the workpiece, which reduces the impact force of the upper part on the conveying line, reduces the injury to the operator caused by the workpiece turning or shaking, and improves the safety of the upper part.

Description

An auxiliary device for loading and unloading large-scale special-shaped workpieces

technical field

The invention relates to a moving device matched with a coating machine, in particular to an auxiliary device for loading and unloading large-scale special-shaped workpieces.

Background technique

According to the current spraying requirements for the surface of the workpiece in the painting industry, for the painting and spraying process of the surface of the workpiece, it is generally necessary to hang the workpieces one by one through the chain suspension conveyor production line, and then send them to the spray booth for paint spraying. The so-called chain-type suspension conveying production line is a common conveying production line in spraying production that pulls the workpiece to move. It uses the circular motion of the chain as the traction. There are hanging hooks on the chain to hang the workpiece on the hook. With the operation of the chain, the workpiece is transported into the production line of the spray booth to spray paint on the workpiece. After the spraying process is completed, the workpiece is transported to the next process for subsequent process tasks. During the whole spraying process, the workpiece is always suspended on the chain suspension conveyor, and the chain suspension conveyor line sends the workpiece to each spraying process for spraying production.

For general small and regular workpieces, because of their small weight, they can be directly hung on the hooks of the suspension conveyor line for movement, which will not affect the suspension conveyor line. For some large and irregular special-shaped workpieces (such as buckets, connecting rods, quick-change and other heavy-duty welded parts in construction machinery), the lifting and mounting between the workpiece and the conveyor hook is a very difficult point. Due to the heavy weight and irregular shape of the workpiece, when the upper and lower parts are suspended, the center of gravity of the workpiece will change instantly, such as turning over, swinging and other uncertain phenomena, which will not only cause a great impact on the conveyor line, but also cause the workpiece to hang A large swing occurs on the hook hanger, which poses a great threat to the safety of the operators next to it, with a high degree of danger, and the operation is time-consuming and labor-intensive, and the labor intensity of the workers is high.

Contents of the invention

The technical problem to be solved by the present invention is to provide an auxiliary device for upper and lower parts of large special-shaped workpieces in order to overcome the above-mentioned deficiencies in the prior art. Auxiliary movement before hoisting of heavy and irregular workpieces. Before the workpiece is ready to be mounted on the conveying line, the workpiece to be uploaded is hoisted on the accompanying posture correction platform of the present invention by a crane, and the workpiece is adjusted to the hook of the chain conveying line through the hydraulic lifting platform and the horizontal moving platform. On the lower side, carry out the suspension upper part of the conveyor line hook. During loading, the small turning motion of the workpiece is assisted by the accompanying posture calibration platform in time to correct the posture, so that the transmission parts of the conveyor line can obtain the minimum impact force and achieve the purpose of safe loading.

The technical solution of the present invention is to include a hydraulic lifting device, and its hydraulic lifting platform 1 is moved up and down by a hydraulic cylinder 12 and a connecting rod 13. It is characterized in that: the hydraulic lifting platform 1 is provided with a horizontal travel device and an accompanying posture correction device The horizontal transfer device includes a large flat horizontal transfer platform 4, a transfer slide rail 3, a transfer rail 2 and a chain transmission mechanism, and the horizontal transfer platform 4 is supported on the transfer rail 2 of the hydraulic lifting platform 1 by the transfer slide rail 3 On the top, it is driven by a chain transmission mechanism, and moves horizontally relative to the hydraulic lifting platform level 1; the accompanying attitude correction device is arranged on the horizontal movement platform 4, and is composed of an accompanying roller table 5 and a tray-type accompanying attitude correction platform 6, The workpiece 7 is placed on the accompanying posture correction platform 6, and moves along with it arbitrarily on the accompanying roller table 5.

Described chain transmission mechanism comprises driving motor 20, driving sprocket 14, driven sprocket 16 and the transmission chain 15 of vertical circulation operation, and horizontal movement platform 4 is connected with transmission chain 15, is passed through transmission chain 15 by driving motor 20. Drive horizontally moving platform 4 to make horizontal linear motion.

The accompanying roller table 5 is a non-powered roller table, which is formed by parallel arrangement of idling accompanying rollers 35; the accompanying rollers 35 are supported on the roller table support 40 through bearings 38 and accompanying roller support shafts 39, and the roller table support 40 It is fixed on the horizontal moving platform 4; the accompanying attitude checking platform 6 is a tray for placing large workpieces 7, which is directly placed on the accompanying roller 35 of the accompanying roller table 5; the side of the accompanying attitude checking platform 6 is provided with two vertical and horizontal The accompanying guide wheels 36,41 of direction spacing.

Described roller table support 40 is the channel steel that cross-section is in the shape of 凵; The accompanying guide wheels 36, 41 of described horizontal and vertical two directions limit, wherein the wheel of the accompanying guide wheel 36 of lateral limit and accompanying posture correction platform are arranged in parallel, And roll horizontally on the vertical side of the "凵"-shaped roller table support 40; wherein the wheels of the accompanying guide wheels 41 of the vertical limit are vertically arranged with the accompanying posture correction platform, and the "凵"-shaped roller table on the other side The lateral sides of the support 40 roll vertically.

The middle part of the hydraulic lifting platform is also equipped with an auxiliary walking device, including a square tube beam 21, a chain guide wheel 18, a chain support rail 32, an auxiliary walking track 30 and an auxiliary walking roller 28. The square tube beam 21 is fixed on the hydraulic lifting platform 1, Chain guide wheel 18 is supported in the square pipe of square tube crossbeam 21 by bearing 34 and shaft pin 33; side; the auxiliary walking roller 28 is supported on the lower side of the horizontal travel platform 4 through the pin shaft 29 and the support seat 27, and assists in running on the auxiliary travel track 30, so that the horizontal travel platform 4 forms a left, middle and right multi-track support; chain support rail 32 is a "convex" shape track, the transmission chain 15 of the vertical circular operation, the top of its circular transmission chain 15 runs on the convex chain support rail 32 outside the square tube beam 21, and the bottom of its circular transmission chain 15 is on the The tube of the square tube crossbeam 21 passes through, and is rolled and lifted by the chain guide wheel 18 in the tube.

Described moving track 2 is made of track support 25 and track roller 22,26, and track roller 22,26 is supported on the track support 25 by axle pin 24 and bearing 23, and track support 25 is set on the hydraulic lift platform 1 auxiliary; The rail 3 is a slide block type slide rail, which is arranged on the lower side of the horizontal travel platform 4 , and the horizontal travel platform 4 is moved on the travel rail 2 by the travel slide rail 3 .

The hydraulic lifting platform 1 is supplemented with two rows of symmetrically arranged moving tracks 2, wherein the track rollers 22 in one side of the moving track 2 are flat rollers, and the track rollers 26 in the other side of the moving track 2 are concave with flanges. Roller, in order to avoid deviation phenomenon when moving slide rail 3 runs.

Both sides of the horizontal moving platform 4 are also provided with safety guardrails 11 .

The driving motor 20 in the chain transmission mechanism is fixed on the hydraulic lifting platform 1, the driving sprocket 14 is directly supported on the output shaft of the driving motor 20, and the driven sprocket 16 is supported on the square tube beam on the hydraulic lifting platform 1 21; its driven sprocket 16 is a tensioning wheel, and the axial center position between the driven sprocket 16 and the driving sprocket 14 is regulated by the chain tension adjustment lever 17.

The transmission chain 15 in the chain transmission mechanism and the horizontal travel platform 4 are connected to each other by a chain pressing plate 42 .

Compared with the prior art, the present invention has the following advantages:

It integrates the three motion functions of hydraulic lifting, horizontal shifting and accompanying posture correction, and realizes the auxiliary movement of the upper part for safe lifting of large-sized, heavy-weight, irregular-shaped workpieces. Before the workpiece is ready to be mounted on the conveying line, the workpiece to be uploaded is hoisted on the accompanying posture correction platform of the present invention by a crane, and then the workpiece is adjusted to the hook of the conveying line through the hydraulic lifting platform and the horizontal moving platform On the lower side, carry out the suspension and upper action of the conveyor line hook. When the workpiece is suspended on the upper part, the small turning action of the workpiece is assisted in time by the accompanying posture correction platform, so that the transmission parts of the conveyor line can obtain the minimum impact force, and at the same time reduce the injury to the operator caused by the turning or shaking of the workpiece, to achieve The purpose of safely translating upper parts. in:

First, the horizontal moving device is a large flat structure, equipped with guardrails and other safety protection devices, allowing the operator to stand on the accompanying posture calibration platform, and use the remote control handle to complete mechanical actions such as lifting, translation, and accompanying posture calibration;

The second is that the lifting action is completed by the fork-type hydraulic lifting platform, which has the advantages of stable performance, large lifting weight, high cost performance, and easy maintenance;

The third is the operation of the horizontal moving platform, which is completed by the drive motor and chain transmission mechanism. Compared with the use of cylinders and other devices, it is more suitable for environments with poor working conditions, simple structure and low cost;

The fourth is that the accompanying posture correction action uses the non-powered roller table and the accompanying guide wheel mechanism equipped with horizontal and vertical direction limits, which can satisfy the workpiece in the lifting state, regardless of the state of the workpiece, after the upper part is lifted, it can be according to the workpiece. The position of the center of gravity can be adjusted by itself, reducing the working hours of operators and improving safety performance.

Description of drawings

Fig. 1 is a structural representation of the present invention, that is, A-A sectional view in Fig. 3;

Fig. 2 is the B-B sectional view among Fig. 1;

Fig. 3 is the top view of Fig. 2;

Figure 4 is the Partial (travel track 1) enlarged view;

Figure 5 is the Partial (travel track 2) enlarged view;

Figure 6 is the Partial (assisted walking device) enlarged view;

Fig. 7 is an enlarged view of the local structure of the accompanying roller table 5 in Fig. 1;

Figure 8 is the A partial enlarged view, that is, a structural schematic diagram of the connecting part of the horizontal travel platform 4 and the transmission chain 15;

Figure 9 is the Partial (chain tension adjustment mechanism) enlarged view.

Labels in the figure: 1-hydraulic lifting platform, 2-traveling track, 3-traveling slide rail, 4-horizontal traveling platform, 5-accompanied roller table, 6-accompanied posture calibration platform, 7-workpiece, 8-operator, 9 -suspension hook, 10-conveyor line, 11-safety guardrail, 12-hydraulic cylinder, 13-connecting rod, 14-driving sprocket, 15-transmission chain, 16-driven sprocket, 17-chain tension adjustment lever Adjustment, 18-chain guide wheel, 19-limit end gear, 20-drive motor, 21-square tube beam, 22-track roller (flat roller), 23-bearing, 24-shaft pin, 25-track bracket, 26 -track roller (concave roller with flanging), 27-support seat, 28-auxiliary walking roller, 29-pin shaft, 30-auxiliary walking track, 31-shield plate, 32-chain support rail, 33-bearing , 34-axis pin, 35-traveling roller, 36-traveling guide wheel, 37-roller table support, 38-bearing, 39-traveling roller support shaft, 40-spring, 41-traveling guide wheel, 42-chain pressing plate.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

The workpiece 7 with large size, heavy weight and irregular shape given in the accompanying drawings of the specification of the present invention is an example of a bucket in construction machinery.

The present invention is composed of three parts: a hydraulic lifting device, a horizontal travel device and an accompanying posture correction device.

The hydraulic lifting device includes a hydraulic lifting platform 1 , a hydraulic cylinder 12 and a connecting rod 13 . The hydraulic cylinder 12 moves the hydraulic lifting platform 1 up and down through the connecting rod 13 . The horizontal moving device and the accompanying attitude checking device are arranged on the hydraulic lifting platform 1 . see picture 1.

The horizontal moving device includes a large plate-type horizontal moving platform 4, a moving slide rail 3, a moving track 2 and a chain transmission mechanism, and the horizontal moving platform 4 is supported on the moving track 2 of the hydraulic lifting platform 1 through the moving slide rail 3 , is driven by a chain transmission mechanism, and moves horizontally relative to the hydraulic lifting platform level 1. See Figure 1, Figure 2, Figure 3.

Moving track 2 is made of track support 25 and track roller 22,26, and track roller 22,26 is supported on the track support 25 by axle pin 24 and bearing 23, and track support 25 is set on the hydraulic lifting platform 1 auxiliary. The moving slide rail 3 is a slider type slide rail, which is fixed on the lower side of the horizontal moving platform 4 , and the horizontal moving platform 4 moves on the moving track 2 through the moving sliding rail 3 . In this embodiment, the hydraulic lifting platform 1 is supplemented with two rows of symmetrically arranged moving tracks 2, wherein the track rollers 22 in the moving track 2 on one side are flat rollers, as shown in Figure 4; the track rollers 26 in the moving track 2 on the other side It is a "concave" shaped roller with flanging, as shown in Figure 5, to limit the lateral sides of the sliding rail 3, to avoid deviation when the sliding rail 3 is running, and to ensure that the horizontal traveling platform 4 is relative to the hydraulic lifting platform 1 for horizontal straight line shift. In order to prevent the derailment of the horizontal traveling platform 4, the two ends of the track bracket 25 of the traveling track 2 are provided with limiting end stops 19 to limit the moving position of the moving horizontal traveling platform 4.

The accompanying posture correction device is arranged on the horizontal moving platform 4, and is composed of a traveling roller table 5 and a tray-type accompanying posture correction platform 6. The workpiece 7 is placed on the accompanying posture correction platform 6, and on the Arbitrary follow-up movement, see Figure 1.

Accompanying roller table 5 is a non-powered roller table, which is formed by parallel arrangement of idle-running accompanying rollers 35, as shown in Fig. 7 . The accompanying roller 35 is supported on the roller table support 40 through the bearing 38 and the accompanying roller supporting shaft 39 , and the roller table support 40 is fixed on the horizontal travel platform 4 . Accompanying posture correction platform 6 is the pallet for placing large workpiece 7, directly placed on the accompanying roller 35 of accompanying roller table 5. The side of accompanying posture correction platform 6 is provided with the accompanying guide wheels 36,41 of vertical and horizontal two direction spacing. The roller table bracket 40 is a channel steel with a cross section in the shape of "凵". The traveling guide wheels 36, 41 that are limited in both directions horizontally and vertically, wherein the wheels of the traveling guide wheels 36 that are laterally limited are arranged parallel to the accompanying posture correction platform, and roll horizontally on the vertical side of the vertical roller support 40 wherein the wheels of the accompanying guide wheels 41 of the vertical limit are vertically arranged with the accompanying posture correction platform, and roll vertically on the lateral side of the "凵" shaped roller table support 40 on the other side. The accompanying guide wheels 36 and 41 of the horizontal and vertical two direction limits are provided with a certain movement gap with the "凵" shaped channel steel of the roller table support 40, to offset the large workpiece 7 on the accompanying posture correction platform 6, due to the center of gravity Turning force caused by instability.

The middle part of the hydraulic lifting platform is also provided with a group of auxiliary walking devices, see Fig. 6, is made up of square tube beam 21, chain guide wheel 18, chain support rail 32, auxiliary walking track 30 and auxiliary walking roller 28. The square tube beam 21 is fixed on the hydraulic lifting platform 1, and the chain guide wheel 18 is supported in the square pipeline of the square tube beam 21 by the bearing 34 and the pivot pin 33. The chain support rail 32 and the auxiliary walking rails 30 symmetrically arranged on both sides of the chain support rail 32 are fixed on the outer upper side of the square tube beam 21 . The auxiliary walking roller 28 is supported on the lower side of the horizontal travel platform 4 through the pin shaft 29 and the support seat 27, and assists in running on the auxiliary travel track 30, so that the horizontal travel platform 4 forms a left, middle and right multi-track support; the chain support rail 32 is The "convex" shape track, the transmission chain 15 of the vertical circular operation, the top of its circular transmission chain 15 runs on the "convex" shape chain support rail 32 outside the square tube beam 21, and the bottom of its circular transmission chain 15 is The tube of the square tube crossbeam 21 passes through, and is rolled and lifted by the chain guide wheel 18 in the tube.

Described chain transmission mechanism, see Fig. 3, is mainly made up of drive motor 20, driving sprocket 14, driven sprocket 16 and the transmission chain 15 of vertical circulation operation, horizontal movement platform 4 is connected with transmission chain 15, by The driving motor 20 drives the horizontally moving platform 4 to move horizontally and linearly through the transmission chain 15 . The driving motor 20 is fixed on the hydraulic lifting platform 1, the driving sprocket 14 is directly installed on the output shaft of the driving motor 20, and the driven sprocket 16 is supported on the square tube beam 21 on the hydraulic lifting platform 1. The driven sprocket 16 is a tensioning wheel, and the axis position between the driven sprocket 16 and the driving sprocket 14 can be adjusted through the chain tension adjustment lever 17, so as to achieve the purpose of tensioning the chain, as shown in Fig. 3, Figure 9. The transmission chain 15 and the horizontal travel platform 4 are connected by clamping each other through the chain pressing plate 42, as shown in FIG. 8 . When the transmission chain 15 runs under the drive of the drive motor, it can drive the horizontally moving platform 4 to move horizontally.

In order to enable the operator 8 to stand on the horizontal travel platform 4 for safe operation, a safety guardrail 11 is provided on the side of the horizontal travel platform 4 .

When the present invention is operated, its operator 8 can stand on the horizontal travel platform 4, and carry out remote control operation.

The present invention integrates three movement functions of hydraulic lift, horizontal movement and accompanying posture correction, and realizes the auxiliary movement of the upper part for safe hoisting of large-sized, heavy-weight, special-shaped and irregular workpieces 7 . Before the workpiece is ready to be mounted on the conveying line 10, the workpiece 7 to be loaded is hoisted on the accompanying posture correction platform 6 of the present invention with a crane, and then the workpiece 7 is lifted by the hydraulic lifting platform 1 and the horizontal travel platform 4 Adjust to the lower side of the suspension hook 9 position of the conveying line 10, and then carry out the upper part action of the suspending hook 9 of the conveying line 10. When the workpiece 7 hangs on the upper part, the small turning action of the workpiece 7 is assisted in time by the accompanying attitude calibration platform 6, so that the transmission parts on the conveying line 10 can obtain the minimum impact force, and at the same time reduce the impact caused by the change of the center of gravity of the workpiece 7. The slight overturning or shaking of the machine will cause injury to the operator 8, and achieve the purpose of safe loading.

The bearing size of the hydraulic lifting platform 1 of the present invention is 5000mm in length, 2500mm in width, and a bearing weight of 1200kg. The hydraulic lifting platform of 2 tons is directly purchased by external cooperation, and the lifting height is 1.2m. The load-bearing size of the horizontal moving platform 4 is 2500mm in length, 1200mm in width, design 10-moving platform width 2500mm; the moving slide rail uses 40×20 square steel, the moving track length is 2500mm, and the distance between track rollers 22 or 26 is 760mm. The rollers need to meet the frequent impact of workpiece 7 when loading and unloading, so as to ensure the service life. The length of accompanying posture correction platform 6 is 1500mm, width 800mm, accompanying distance 1000mm; The total length of accompanying roller table 5 is 2500mm, and width is 800mm.

Claims (10)

1. Auxiliary device for upper and lower parts of large special-shaped workpieces, including hydraulic lifting device, the hydraulic lifting platform (1) is lifted and lowered by hydraulic cylinder (12) and connecting rod (13), characterized in that: hydraulic lifting platform (1) It is equipped with a horizontal moving device and an accompanying posture correction device; the horizontal moving device includes a large flat horizontal moving platform (4), a moving slide rail (3) and a chain transmission mechanism, and the horizontal moving platform (4) moves through The slide rail (3) is supported on the moving track (2) of the hydraulic lifting platform 1, and is driven by a chain transmission mechanism, and moves horizontally relative to the hydraulic lifting platform (1); the accompanying posture correction device is installed on the horizontal moving platform On (4), it is composed of the accompanying roller table (5) and the pallet-type accompanying posture correction platform (6). The workpiece (7) is placed on the accompanying posture correction platform (6), and is placed on the Move as you please. 2. The auxiliary device for the upper and lower parts of large special-shaped workpieces according to claim 1, characterized in that: the chain transmission mechanism includes a driving motor (20), a driving sprocket (14), a driven sprocket (16) and The transmission chain (15) of vertical circular operation, the horizontal movement platform (4) is connected with the transmission chain (15), and the horizontal movement platform (4) is driven by the drive motor (20) through the transmission chain (15) to perform horizontal linear motion. 3. The auxiliary device for the upper and lower parts of large special-shaped workpieces according to claim 1, characterized in that: the accompanying roller table (5) is a non-powered roller table, which is formed by parallel arrangement of idling accompanying rollers (35) ; The accompanying roller (35) is supported on the roller table support (40) through the bearing (38) and the accompanying roller support shaft (39), and the roller table support (40) is fixed on the horizontal travel platform (4); the accompanying posture correction platform (6) The pallet for placing the large workpiece (7) is directly placed on the accompanying roller (35) of the accompanying roller table (5); The accompanying guide wheels (36, 41) of the position. 4. The auxiliary device for the upper and lower parts of large special-shaped workpieces according to claim 3, characterized in that: the roller table support (40) is a channel steel with a cross-section; Wheels (36, 41), wherein the wheels of the accompanying guide wheels (36) of lateral limitation are arranged in parallel with the accompanying posture correction platform, and roll horizontally on the vertical side of the "凵" shaped roller table support (40); wherein the vertical The wheels of the accompanying guide wheels (41) of the spacing are vertically arranged with the accompanying posture correction platform, and roll vertically on the lateral side of the "凵" shape roller table support (40) on the other side. 5. The auxiliary device for the upper and lower parts of large special-shaped workpieces according to claim 1 or 2, characterized in that: the middle part of the hydraulic lifting platform is also equipped with auxiliary walking devices, including square tube beams (21), chain guide wheels (18) , chain support rail (32), auxiliary walking track (30) and auxiliary walking roller (28), the square tube beam (21) is fixed on the hydraulic lifting platform (1), and the chain guide wheel (18) passes through the bearing (34) and Axle pin (33) is supported in the square pipeline of square tube crossbeam (21); Chain support rail (32) and the auxiliary walking track (30) that is symmetrically located at chain support rail (32) both sides are fixed on square tube crossbeam (21 ); the auxiliary walking roller (28) is supported on the lower side of the horizontal moving platform (4) through the pin shaft (29) and the support seat (27), and runs on the auxiliary walking track (30) to make the horizontal The moving platform (4) constitutes the left, middle and right multi-track support; the chain support rail (32) is a "convex" track, and the vertical circular transmission chain (15), the upper part of the circular transmission chain (15) is in the square Running on the convex chain support rail (32) outside the tube beam (21), the lower part of its circular transmission chain (15) passes through the tube of the square tube beam (21), and is rolled by the chain guide wheel (18) inside the tube lifting. 6. The auxiliary device for the upper and lower parts of large special-shaped workpieces according to claim 1, characterized in that: the moving track (2) is composed of track brackets (25) and track rollers (22, 26), and the track rollers (22, 26) 26) It is supported on the track support (25) through the shaft pin (24) and the bearing (23), and the track support (25) is auxiliary installed on the hydraulic lifting platform (1); the moving slide rail (3) is a slider type slide rail , is arranged on the lower side of the horizontal moving platform (4), and the horizontal moving platform (4) is moved on the moving track (2) by the moving slide rail (3). 7. The auxiliary device for the upper and lower parts of large special-shaped workpieces as claimed in claim 1 or 6, characterized in that: the hydraulic lifting platform (1) is supplemented with two rows of symmetrically arranged moving tracks (2), and one side of the moving track The track roller (22) in (2) is a flat roller, and the track roller (26) in the moving track (2) on the other side is a concave roller with flanging, so as to avoid running when the moving slide rail (3) is running. Partial phenomenon. 8. The auxiliary device for the upper and lower parts of large and special-shaped workpieces according to claim 1, characterized in that: safety guardrails (11) are also provided on both sides of the horizontally moving platform (4). 9. The auxiliary device for the upper and lower parts of large special-shaped workpieces according to claim 1 or 2, characterized in that: the driving motor (20) in the chain transmission mechanism is fixed on the hydraulic lifting platform (1), and the driving sprocket (14) is directly supported on the output shaft of the drive motor (20), and the driven sprocket (16) is supported on the square tube beam (21) on the hydraulic lifting platform (1); the driven sprocket (16) is Tensioning wheel, adjust the axis position between the driven sprocket (16) and the driving sprocket (14) through the chain tensioning adjustment lever (17). 10. The auxiliary device for the upper and lower parts of large special-shaped workpieces according to claim 1 or 2, characterized in that: between the transmission chain (15) in the chain transmission mechanism and the horizontal moving platform (4), the chain pressure plate is passed (42) Make it interconnected.