Double-station double-layer circulation line with rotatable clamp and capable of conveying products accurately in step pitch and positioning products accurately

Abstract

The utility model discloses a double-station double-layer circulation line with a rotatable clamp, which is capable of accurately conveying a product in a step pitch manner and accurately positioning the product, and relates to the technical field of battery manufacturing equipment. Comprising a machine frame, an upper-layer horizontal linear sliding rail and an upper-layer side face linear sliding rail are arranged on an upper-layer station, a lower-layer horizontal linear sliding rail is arranged on a lower-layer station, lifting connection devices are arranged at the two ends of the upper-layer station, clamps are connected to the upper-layer horizontal linear sliding rail and the lower-layer horizontal linear sliding rail, and a horizontal transverse moving assembly is slidably connected to the upper-layer side face linear sliding rail. A clamp positioning assembly and a backflow synchronous belt driving plate assembly are arranged on the upper-layer station, the backflow synchronous belt driving plate assembly is used for driving a clamp to move back, and a lower-layer belt assembly is arranged on the lower-layer station and used for driving the clamp on the lower-layer station to move. Products are conveyed and positioned on the upper layer of the circulation line with the clamps as carriers, empty clamps flow back on the lower layer, lifters are arranged at the two ends of the circulation line and connected with the upper-layer lifting clamps and the lower-layer lifting clamps, and the clamps circularly flow between the upper layer and the lower layer.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing equipment, in particular to a double-station double-layer circulation line with a rotatable clamp for accurately step-transmitting and precisely positioning products. Background Art

[0002] In the front and middle stages of the production process of new energy lithium batteries, cell (or battery) conveying devices are required between the internal processes of the production equipment. Many of these processes require precise positioning of the cells (or batteries), and each workstation has high requirements for repeated positioning accuracy. During the production and processing of cells (or batteries), there are requirements for the structural rigidity of the fixtures and conveying devices. As manufacturers have higher and higher demands for equipment production efficiency, higher requirements are placed on the conveying devices.

[0003] Therefore, it is necessary to provide a double-station double-layer circulation line with a rotatable fixture that has accurate and stable positioning, high transmission efficiency, precise step transmission, and precise positioning of products. Utility Model Content

[0004] The main purpose of the utility model is to provide a double-station double-layer circulation line with a rotatable clamp for accurate step transmission and precise positioning of products, so as to solve the problems existing in the prior art.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A double-station double-layer circulation line with a rotatable clamp for accurately step-by-step transmission and precise positioning of products, including a frame with an upper station and a lower station, the upper station is provided with an upper horizontal linear slide and an upper side linear slide, the lower station is provided with a lower horizontal linear slide, both ends of the upper station are provided with a lifting and connecting device, the upper horizontal linear slide and the lower horizontal linear slide are both slidably connected with a clamp, the upper side linear slide is slidably connected with a horizontal transverse movement component, the upper station is also provided with a clamp positioning component, the lower station is provided with a lower belt component, and the lower belt component is used to drive the movement of the clamp on the lower station.

[0007] Furthermore, the horizontal transverse movement assembly includes a module, a lifting cylinder, a displacement lifting plate and a cam follower mounting plate. The module and the lifting cylinder are connected to the upper workstation. The displacement lifting plate is connected to the upper side linear slide rail through a slide. The module is connected to the slide. The slide is provided with a lifting slide rail. The displacement lifting plate is slidably connected to the lifting slide rail. The cam follower mounting plate is connected to the displacement lifting plate. The displacement lifting plate is connected to the power output end of the lifting cylinder. Two cam followers are provided on the cam follower mounting plate. The two cam followers are used to clamp the clamp.

[0008] Furthermore, the fixture is provided with a drag positioning block and a positioning U-shaped block, the two cam followers cooperate to clamp the drag positioning block, and the fixture positioning assembly is used to connect the positioning U-shaped block.

[0009] Furthermore, the fixture positioning assembly includes a positioning cylinder, a positioning shaft, a positioning bearing seat and a positioning cam mounting plate. The positioning cylinder is movably connected to the upper workstation and is located on one side of the fixture. The positioning bearing seat is connected to the upper workstation. The positioning shaft is rotatably connected to the positioning bearing seat. The positioning cam mounting plate is connected to the positioning shaft.

[0010] Furthermore, a T-shaped hinge column is connected to the upper workstation, and one end of the positioning cylinder is hinged to the T-shaped hinge column through a lug.

[0011] Furthermore, the lower belt assembly includes a synchronous belt, a synchronous belt driving wheel assembly and a synchronous belt driven wheel assembly. The synchronous belt driving wheel assembly and the synchronous belt driven wheel assembly are both rotatably connected to the lower workstation. The synchronous belt is connected to the synchronous belt driving wheel assembly and the synchronous belt driven wheel assembly. The synchronous belt is used to drive the movement of the fixture on the lower workstation.

[0012] Furthermore, a positioning assembly is provided on one side of the lifting and connecting device.

[0013] Furthermore, a reflow synchronous belt drive plate assembly is provided on the fixture, and the reflow synchronous belt drive plate assembly is used to clamp the synchronous belt of the lower belt assembly.

[0014] Furthermore, a fixture rotation mechanism is symmetrically arranged on both sides of each workstation on the upper level, and the fixture rotation mechanism includes a support frame connected to the frame, and the top of the support frame is connected to the Y-axis transverse cylinder and the Y-axis transverse linear slide through a support plate, and a bottom slide is slidably connected to the Y-axis transverse linear slide, and one end of the bottom slide is connected to the power output end of the Y-axis transverse cylinder, and the bottom slide is connected to the Z-axis lifting cylinder, and the power output end of the Z-axis lifting cylinder is connected to a side support plate, and the side support plate is connected to a torque motor and a fixture support rotating plate, and a diamond pin and a cylindrical pin are provided on the fixture support rotating plate.

[0015] Furthermore, the fixture includes a fixture base and a carrier assembly;

[0016] The fixture base includes a base plate, a carrier mounting plate, a positioning pin and a connecting plate. The base plate is slidably connected to the frame, the carrier mounting plate is connected to the base plate, the positioning pin is provided on the top of the carrier mounting plate, and a connecting plate is connected between the two carrier mounting plates on the same side of the base plate;

[0017] The carrier assembly includes a carrier and a bushing. The carrier is connected to the carrier mounting plate through an intermediate piece, and the intermediate piece is provided with a bushing.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The utility model uses fixtures as carriers to convey and position products on the upper layer of the circulation line, and empties fixtures are returned on the lower layer. Elevators are provided at both ends of the circulation line to connect the upper and lower lifting fixtures. The fixtures circulate between the upper and lower layers. When the fixtures are not moving, the positions of the fixtures can be clamped and fixed. When the fixtures move, the horizontal transverse movement components can be used to drive the fixtures to move accurately and stably. The positioning of the device is accurate and stable, and the transmission efficiency is high.

[0020] The device has low cost, good effect, stable and reliable clamping effect, easy use and maintenance, and high automation and conveying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of a double-station double-layer circulation line with a rotatable fixture for precise step transmission and accurate positioning of products in accordance with Example 1.

[0022] Figure 2 for Figure 1 A partial enlarged view of .

[0023] Figure 3 This is a top view of a double-station double-layer circulation line with a rotatable fixture for precise step transmission and accurate positioning of products in Example 1.

[0024] Figure 4 This is a three-dimensional diagram of a double-station double-layer circulation line with a rotatable clamp for precise step transmission and accurate positioning of products in Example 1.

[0025] Figure 5 This is another stereoscopic view of a double-station double-layer circulation line with a rotatable clamp for accurately step-by-step transmission and precise positioning of products in accordance with the first embodiment.

[0026] Figure 6 for Figure 5 A partial enlarged view of .

[0027] Figure 7 This is a top view of a double-station double-layer circulation line with a rotatable clamp for precise step transmission and accurate positioning of products in Example 2.

[0028] Figure 8 This is a side view of a double-station double-layer circulation line with a rotatable clamp for accurately step-by-step transmission and precise positioning of products in Example 2.

[0029] Figure 9 for Figure 7Magnified view of part A.

[0030] Figure 10 for Figure 8 Magnified view of part B.

[0031] Figure 11 A schematic diagram of the fixture.

[0032] Figure 12 Another schematic diagram of the fixture.

[0033] Figure 13 This is a three-dimensional diagram of a double-station double-layer circulation line with a rotatable clamp for accurately step-by-step transmission and precise positioning of products in Example 2.

[0034] Figure 14 for Figure 13 Magnified view of part C.

[0035] Figure 15 This is another stereoscopic view of a double-station double-layer circulation line with a rotatable clamp for accurately step-by-step transmission and precise positioning of products in Example 2.

[0036] Figure 16 for Figure 15 Enlarged view of part D.

[0037] Figure 17 The figure is an exploded diagram of the fixture.

[0038] Among them, 100-frame; 110-upper horizontal linear slide; 120-upper side linear slide; 130-lower horizontal linear slide; 200-lifting shuttle; 210-lifting shuttle slide; 220-lifting card positioning assembly; 300-lowering shuttle; 310-lowering shuttle slide; 320-lowering card positioning assembly; 400-clamp; 410-drag positioning block; 420-return synchronous belt drive plate assembly; 430-positioning U-shaped block; 500-module; 510-lifting cylinder; 520-displacement lifting plate; 530-lifting slide; 540-cam follower mounting plate; 600-positioning shaft; 61 0-positioning cylinder; 620-positioning bearing seat; 630-positioning cam mounting plate; 700-synchronous belt; 710-synchronous belt drive wheel assembly; 720-synchronous belt driven wheel assembly; 800-support frame; 810-Y-axis transverse cylinder; 820-Y-axis transverse linear slide; 830-bottom slide; 840-Z-axis lifting cylinder; 850-Z-axis lifting linear slide; 860-torque motor; 870-clamp supporting rotating plate; 871-diamond pin; 872-cylindrical pin; 900-base plate; 901-carrier mounting plate; 902-positioning pin; 903-connecting plate; 910-carrier; 911-bushing; 912-bushing. DETAILED DESCRIPTION

[0039] The technical solution of the present utility model is further described below through the accompanying drawings and embodiments.

[0040] Example 1

[0041] Combine Figure 1-6 The utility model provides a double-station double-layer circulation line with a rotatable clamp for precise step transmission and precise positioning of products, including a frame 100 with an upper station and a lower station, the upper station is provided with an upper horizontal linear slide 110 and an upper side linear slide 120, the lower station is provided with a lower horizontal linear slide 130, and both ends of the upper station are provided with a lifting and connecting device, the upper horizontal linear slide 110 and the lower horizontal linear slide 130 are both slidably connected with a clamp 400, the upper side linear slide 120 is slidably connected with a horizontal transverse movement component, the upper station is also provided with a clamp positioning component, the lower station is provided with a lower belt component, and the lower belt component is used to drive the clamp 400 on the lower station to move.

[0042] The upper horizontal linear slide rail 110 can be provided with a plurality of fixtures 400 according to actual production needs, forming a plurality of workstations for conveniently clamping the battery cells or batteries.

[0043] As an optimization, a reflow synchronous belt driving plate assembly 420 is provided on the clamp 400, and the reflow synchronous belt driving plate assembly 420 is used to clamp the synchronous belt 700 of the lower belt assembly.

[0044] The lifting and connecting device is provided with a lifting and connecting slide rail 210 to facilitate the movement of the clamp 400 on the lifting and connecting device.

[0045] The horizontal transverse movement assembly includes a module 500, a lifting cylinder 510, a displacement lifting plate 520 and a cam follower mounting plate 540. The module 500 and the lifting cylinder 510 are connected to the upper workstation. The displacement lifting plate 520 is horizontally slidably connected to the upper side linear slide 120 through a slide. The module 500 is connected to the slide. The module 500 is used to drive the slide to move along the trajectory of the upper side linear slide 120. A lifting slide 530 is provided on the slide. The displacement lifting plate 520 is slidably connected to the lifting slide 530. The cam follower mounting plate 540 is connected to the displacement lifting plate 520. The displacement lifting plate is connected to the power output end of the lifting cylinder. Two cam followers are provided on the cam follower mounting plate. The two cam followers are used to clamp the fixture.

[0046] The clamp 400 is provided with a drag positioning block 410 and a positioning U-shaped block 430. The two cam followers cooperate to clamp the drag positioning block 410 to drive the clamp 400. The clamp positioning assembly is used to connect the positioning U-shaped block 430 to achieve the positioning of the clamp 400.

[0047] The fixture positioning assembly includes a positioning cylinder 610, a positioning shaft 600, a positioning bearing seat 620 and a positioning cam mounting plate 630. The positioning cylinder 610 is movably connected to the upper workstation and is located on one side of the fixture 400. The positioning bearing seat 620 is connected to the upper workstation. The positioning shaft 600 is rotatably connected to the positioning bearing seat 620. The positioning cam mounting plate 630 is connected to the positioning shaft. A positioning cam is connected to the positioning cam mounting plate 630.

[0048] The upper workstation is connected to a T-shaped hinge column, and one end of the positioning cylinder 610 is hinged to the T-shaped hinge column through a lug.

[0049] The lower belt assembly includes a synchronous belt 700, a synchronous belt driving wheel assembly 710 and a synchronous belt driven wheel assembly 720. The synchronous belt driving wheel assembly 710 and the synchronous belt driven wheel assembly 720 are both rotatably connected to the lower workstation. The synchronous belt 700 is connected to the synchronous belt driving wheel assembly 710 and the synchronous belt driven wheel assembly 720. The synchronous belt 700 is used to drive the clamp 400 on the lower workstation to move.

[0050] A positioning assembly is provided on one side of the lifting and connecting device, which is used to clamp or release the positioning U-shaped block 430 on the fixture; in this embodiment, a lifting positioning assembly 220 is provided on one side of the lifting and connecting machine 200; and a lowering positioning assembly 320 is provided on one side of the lowering and connecting machine 300.

[0051] The device disclosed in this embodiment is suitable for transporting battery cells between various processes in the front and middle stages of the new energy lithium battery manufacturing process, and is particularly suitable for situations where the process requires high product positioning and repeated positioning accuracy, short cycle time and high positioning structure rigidity.

[0052] The utility model is suitable for conveying electric cores or batteries, and has the advantages of low cost, good effect, stability and reliability, easy use and maintenance, automation and high efficiency.

[0053] The double-station double-layer circulation line with a rotatable clamp disclosed in this embodiment is used as a conveying device. The clamp 400 is used as a carrier to transport the battery cells or batteries at the upper station. The lifting and connecting devices at both ends connect the upper and lower lifting clamps, and the empty clamps return from the lower layer. The loading and unloading positions are designed on the upper layer of this conveying device. The number of stations between the upper and lower positions can be designed as needed, that is, the specific number of clamps 400, and the spacing between each station is the same. During operation, all the clamps on the upper layer clamp the battery cells or batteries and move one station spacing at the same time. Through such repeated actions, the battery cells or batteries can be transported at equal distances.

[0054] Upper-level fixture transportation: N fixtures 400 are set on the upper workstation to form N workstations (including the lifting and docking positions formed by the lifting and docking devices at both ends). When the end of the upper circulation line (i.e., the descending docking position) is in the fixture-emptying state, the horizontal lateral movement component drags the N-1 fixtures arranged at the beginning (i.e., the ascending docking position) of the upper circulation line together toward the end (descending docking position) by one workstation spacing. After the empty fixture at the end (descending docking position) descends to the lower workstation and flows out of the descending docking machine, the descending docking machine 300 rises back to its position, and at the same time, an empty fixture at the beginning (ascending docking position) is lifted to the upper layer. The horizontal lateral movement component resets and retracts, and the process of dragging the N-1 fixtures arranged at the beginning (ascending docking position) of the upper circulation line together toward the end (descending docking position) by one workstation spacing is restarted. All processes are accompanied by the positioning of the fixtures. This cycle repeats itself, with the fixture on the upper circulation line carrying the cells or batteries to move in steps.

[0055] The specific actions of the equipment when transporting the upper fixture are as follows: the lifting cylinder 510 on the horizontal traverse assembly pushes out the displacement lifting plate 520 and the cam follower mounting plate 540 to rise along the lifting slide rail 530, and the two cam followers on the cam follower mounting plate 540 clamp the drag positioning block 410 on the fixture 400. After the drag positioning blocks 410 of N-1 fixtures are stuck, at the beginning of the upper circulation line (the rising connection position), the positioning assembly 220 is lifted to release the positioning U-shaped block 430 on the fixture. At the same time, the positioning cylinder 610 of the fixture positioning assembly retracts to drive the positioning shaft 600 and the positioning cam mounting plate 630 to rotate around the positioning bearing seat 620, and the positioning cam on the positioning cam mounting plate 630 is disengaged from the positioning U-shaped block 430 on the fixture 400. After the positioning U-shaped blocks 430 of the N-1 fixtures are separated and the positioning of the fixture 400 is released, the module 500 of the horizontal traverse assembly drags the N-1 fixtures together along the upper horizontal linear slide 110 toward the end (the lowering docking position) by one workstation spacing. The reverse process of the above-mentioned action is repeated. The lowering positioning assembly 320 at the end (the lowering docking position) clamps the positioning U-shaped block 430 on the fixture. At the same time, the positioning cylinder 610 of the fixture positioning assembly is pushed out to drive the positioning shaft 600 and the positioning cam mounting plate 630 to rotate around the positioning bearing seat 620. The positioning cam on the positioning cam mounting plate 630 clamps the positioning U-shaped block 430 on the fixture, clamping the positioning U-shaped blocks 430 of the N-1 fixtures to complete the positioning of the upper N-1 fixtures. The lifting cylinder 510 on the horizontal traverse assembly retracts, driving the displacement lifting plate 520 and the cam follower mounting plate 540 to descend along the lifting rail 530. The two cam followers on the cam follower mounting plate 540 are released from the fixture and drag the positioning block 410. After completing these steps, the horizontal traverse assembly returns along the upper side linear guide rail 120 to start the next displacement process cycle.

[0056] Empty fixtures return from the lower level: The lower belt assembly is designed with a descending pause position and an ascending temporary storage position. Empty fixtures at the end (the descending connection position) descend from the upper level to the lower level, exit the descending transfer machine 300, and flow to the descending pause position on the lower level. Simultaneously, an empty fixture temporarily stored in the ascending temporary storage position flows to the starting point (the ascending connection position) and is then lifted to the upper level. All processes are accompanied by fixture positioning. After the cycle, the empty fixtures on the lower level return.

[0057] When the empty fixtures on the lower layer are reflowed, the specific operation of the equipment is as follows: the empty fixture at the end (descending docking position) descends to the lower layer, and after the reflow synchronous belt drive plate assembly 420 on the fixture 400 clamps the synchronous belt of the lower belt line 700, the descending clamping positioning assembly 320 at the end (descending docking position) releases the positioning U-shaped block 430 on the fixture to release the positioning of the empty fixture. Driven by the synchronous belt 700, the empty fixture flows out of the descending shuttle 300 along the descending docking slide 310 and the lower horizontal linear slide 130 to the descending pause position on the lower layer. At the same time, an empty fixture temporarily stored in the ascending temporary storage position flows to the starting end (ascending docking position) along the lifting docking slide 210 and the lower horizontal linear slide 130 under the drive of the synchronous belt 700. After that, the starting end (ascending docking position) 220 lifts the clamping positioning assembly to clamp the positioning U-shaped block 430 on the fixture to complete the positioning of the empty fixture, and the lifting shuttle 200 rises and lifts an empty fixture to the upper layer.

[0058] The process of lifting and connecting is as described above and will not be described in detail again.

[0059] Example 2

[0060] like Figure 7-Figure 17 As shown, this embodiment differs from the first embodiment in that the fixtures circulate on the circulation line, and fixture rotation mechanisms are symmetrically installed on both sides of each upper station. During the equal pauses between battery cell transfers on the double-layer circulation line, the two fixture rotation mechanisms operate to simultaneously lift the two carriers on the same fixture, separate them from the fixture bottom, rotate them 180 degrees, and finally return the carriers to the fixture bottom.

[0061] The fixture rotation mechanism includes a support frame 800 connected to the frame 100, and the top of the support frame 800 is connected to the Y-axis transverse cylinder 810 and the Y-axis transverse linear slide 820 through a support plate. The Y-axis transverse linear slide 820 is slidably connected to the bottom slide 830, and one end of the bottom slide 830 is connected to the power output end of the Y-axis transverse cylinder 810. The bottom slide 830 is connected to the Z-axis lifting cylinder 840 and the Z-axis lifting linear slide 850. The power output end of the Z-axis lifting cylinder 840 is connected to a side support plate, and the side support plate is slidably connected to the Z-axis lifting linear slide 850. The side support plate is connected to a torque motor 860 and a fixture support rotating plate 870, and the fixture support rotating plate 870 is provided with a diamond pin 871 and a cylindrical pin 872.

[0062] The fixture includes a fixture base and a carrier assembly.

[0063] The fixture base includes a base plate 900, a carrier mounting plate 901, a positioning pin 902 and a connecting plate 903. The base plate 900 is slidably connected to the frame 100, the carrier mounting plate 901 is connected to the base plate 900, the positioning pin 902 is provided at the top of the carrier mounting plate 901, and a connecting plate 903 is connected between the two carrier mounting plates 901 located on the same side of the base plate 900.

[0064] The carrier assembly includes a carrier 910 and a bushing. The carrier is connected to the carrier mounting plate 901 via an intermediate piece. The intermediate piece is provided with a bushing 911 and a bushing 912 .

[0065] After the fixture on the upper layer of the double-layer circulation line is transferred to the workstation of the two fixture rotation mechanisms, the circulation line stops and the fixture is positioned. The Y-axis lateral cylinder 810 of the fixture rotation mechanism then operates, pushing the bottom slide 830 and the portion above it along the Y-axis lateral linear guide 820 to the positioning point. At this point, the torque motor 860 and the fixture support rotation plate 870 are inserted into the middle gap on the side of the fixture (the gap between the bottom of the fixture and the carrier), and the diamond pin 871 and cylindrical pin 872 align with the pin holes of the two bushings 912 on the carrier. The Z-axis lift cylinder 840 then activates, pushing the torque motor 860, the fixture support rotating plate 870, the diamond pin 871, and the cylindrical pin 872 along the Z-axis lift linear guide 850 to the set height. At this point, the diamond pin 871 and cylindrical pin 872 on the fixture support rotating plate 870 insert into the pin holes of the bushings 912. The fixture support rotating plate 870 lies flush with the lower surface of the carrier, and the four pin holes of the bushings 911 on the carrier completely disengage from the four locating pins 902 on the carrier mounting plate 901. The torque motor 860 then starts rotating, rotating the separated carrier 180 degrees horizontally from its original position. After the rotation angle, the Z-axis lift cylinder 840 retracts, the carrier descends, and the four locating pins 902 on the carrier mounting plate 901 are reinserted into the four pin holes of the bushings 911 on the carrier to achieve positioning. The diamond pins 871 and cylindrical pins 872 on the fixture support rotation plate 870 are completely disengaged from the pin holes of the bushings 912 and safely positioned. Finally, the Y-axis traverse cylinder 810 of the fixture rotation mechanism retracts, returning the fixture rotation mechanism to its starting position. The device repeats the same cycle.

[0066] The fixture in this embodiment has two workstations, which improves work efficiency. In the fixture with two workstations, the parts of each workstation can be split and rotated to meet processing requirements.

[0067] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A double-station double-layer circulation line with a rotatable fixture for precise step transmission and accurate positioning of products, characterized by: It includes a frame with an upper workstation and a lower workstation, the upper workstation is provided with an upper horizontal linear slide and an upper side linear slide, the lower workstation is provided with a lower horizontal linear slide, both ends of the upper workstation are provided with a lifting and connecting device, the upper horizontal linear slide and the lower horizontal linear slide are both slidably connected with a clamp, the upper side linear slide is slidably connected with a horizontal transverse movement component, the upper workstation is also provided with a clamp positioning component, the lower workstation is provided with a lower belt component, and the lower belt component is used to drive the movement of the clamp on the lower workstation.

2. A double-station double-layer circulation line with a rotatable clamp for precise step transmission and accurate positioning of products as claimed in claim 1, characterized in that: The horizontal transverse movement assembly includes a module, a lifting cylinder, a displacement lifting plate and a cam follower mounting plate. The module and the lifting cylinder are connected to the upper workstation. The displacement lifting plate is connected to the upper side linear slide rail through a slide. The module is connected to the slide. The slide is provided with a lifting slide rail. The displacement lifting plate is slidably connected to the lifting slide rail. The cam follower mounting plate is connected to the displacement lifting plate. The displacement lifting plate is connected to the power output end of the lifting cylinder. Two cam followers are provided on the cam follower mounting plate. The two cam followers are used to clamp the clamp.

3. A double-station double-layer circulation line with a rotatable clamp for precise step transmission and accurate positioning of products as claimed in claim 2, characterized in that: The clamp is provided with a drag positioning block and a positioning U-shaped block. The two cam followers cooperate to clamp the drag positioning block. The clamp positioning assembly is used to connect the positioning U-shaped block.

4. A double-station double-layer circulation line with a rotatable clamp for precise step transmission and accurate positioning of products as claimed in claim 3, characterized in that: The fixture positioning assembly includes a positioning cylinder, a positioning shaft, a positioning bearing seat and a positioning cam mounting plate. The positioning cylinder is movably connected to the upper workstation and is located on one side of the fixture. The positioning bearing seat is connected to the upper workstation. The positioning shaft is rotatably connected to the positioning bearing seat. The positioning cam mounting plate is connected to the positioning shaft.

5. A double-station double-layer circulation line with a rotatable clamp for accurate step transmission and precise positioning of products as claimed in claim 4, characterized in that: The upper workstation is connected with a T-shaped hinge column, and one end of the positioning cylinder is hinged to the T-shaped hinge column through a lug.

6. A double-station double-layer circulation line with a rotatable clamp for accurate step transmission and precise positioning of products as claimed in claim 5, characterized in that: The lower belt assembly includes a synchronous belt, a synchronous belt driving wheel assembly and a synchronous belt driven wheel assembly. The synchronous belt driving wheel assembly and the synchronous belt driven wheel assembly are both rotatably connected to the lower workstation. The synchronous belt is connected to the synchronous belt driving wheel assembly and the synchronous belt driven wheel assembly. The synchronous belt is used to drive the movement of the fixture on the lower workstation.

7. A double-station double-layer circulation line with a rotatable clamp for accurate step transmission and precise positioning of products as claimed in claim 6, characterized in that: A positioning assembly is provided on one side of the lifting and connecting device.

8. A double-station double-layer circulation line with a rotatable fixture for accurate step transmission and precise positioning of products as claimed in claim 1, characterized in that: The fixture is provided with a reflow synchronous belt drive plate assembly, and the reflow synchronous belt drive plate assembly is used to clamp the synchronous belt of the lower belt assembly.

9. A double-station double-layer circulation line with a rotatable fixture for precise step transmission and accurate positioning of products as claimed in claim 1, characterized in that: A clamp rotation mechanism is symmetrically arranged on both sides of each workstation on the upper level, and the clamp rotation mechanism includes a support frame connected to the frame, and the top of the support frame is connected to the Y-axis transverse cylinder and the Y-axis transverse linear slide through a support plate, and a bottom slide is slidably connected to the Y-axis transverse linear slide, and one end of the bottom slide is connected to the power output end of the Y-axis transverse cylinder, and the bottom slide is connected to the Z-axis lifting cylinder, and the power output end of the Z-axis lifting cylinder is connected to a side support plate, and a torque motor and a clamp support rotating plate are connected to the side support plate, and a diamond pin and a cylindrical pin are arranged on the clamp support rotating plate.

10. A double-station double-layer circulation line with a rotatable clamp for accurate step transmission and precise positioning of products as claimed in claim 9, characterized in that: The fixture includes a fixture base and a carrier assembly; The fixture base includes a base plate, a carrier mounting plate, a positioning pin and a connecting plate. The base plate is slidably connected to the frame, the carrier mounting plate is connected to the base plate, the positioning pin is provided on the top of the carrier mounting plate, and a connecting plate is connected between the two carrier mounting plates on the same side of the base plate; The carrier assembly includes a carrier and a bushing. The carrier is connected to the carrier mounting plate through an intermediate piece, and the intermediate piece is provided with a bushing.

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