Battery tray friction stir welding processing tooling

Abstract

The present invention belongs to the field of special welding tooling, and provides a battery tray friction stir welding processing tooling, including a first process tooling, a second process tooling and a third process tooling. The first process tooling includes a first tooling base plate, a first tooling top plate, a first guide rod cylinder, a first rotary clamping cylinder and a lifting clamping cylinder. The second process tooling includes a second tooling base plate, a second tooling top plate, a second guide rod cylinder and a second rotary clamping cylinder. The third process tooling includes a third tooling base plate, a third tooling top plate, a third guide rod cylinder and a third rotary clamping cylinder. The present invention fully considers the processing requirements of each process in the three processes of processing the battery tray, can quickly locate the position of the base plate, plug and side plate in each process and achieve fixation, has good fixing effect, only requires manual loading and unloading, and the fixing and positioning components are all pneumatically controlled, which effectively improves production efficiency.

Description

Technical Field

[0001] The invention belongs to the field of special welding tooling, and in particular relates to a friction stir welding tooling for a battery tray. Background Art

[0002] At present, the electric vehicle industry is developing rapidly. As a carrier of the power battery of electric vehicles, the battery tray plays the role of connecting the power battery and the vehicle body, and plays an important role in the operation of the entire vehicle. The structure of an existing battery tray is as follows: Figure 1 、 2 As shown, the battery tray consists of two bottom plates 01, two plugs 02 and two side plates 03. The two bottom plates 01 are aligned and welded, the two plugs 02 are respectively welded to the two ends of the bottom plate 01, and the two side plates 03 are respectively welded to the two sides of the bottom plate 01. The cross-section of the side plate 03 is an S-shaped right-angle structure. Three connecting parts 031 are connected to the outer side of each side plate 03. A mounting hole 031 is provided at the bottom of the connecting part 031. The protruding parts of the two ends of the side plate 03 are of different lengths, one end is a short rounded corner 032, and the other end is a long rounded corner 033.

[0003] The bottom plate 01, plug 02 and side plate 03 of the battery tray are processed into one piece through three steps of stir friction welding. To ensure welding accuracy, the positions between the bottom plate 01, plug 02 and side plate 03 need to be positioned during welding. Currently, manual measurement is still used for positioning, which is labor-intensive and has low production efficiency. Summary of the Invention

[0004] The present invention provides a battery tray friction stir welding processing tooling, aiming to solve the above technical problems.

[0005] The present invention is achieved in that a battery tray friction stir welding processing tool is used in three processes of processing a battery tray, including a first process tool, a second process tool and a third process tool;

[0006] The first process tooling includes a first tooling base plate, a first tooling top plate connected to the first tooling base plate through a first support plate, and a first guide rod cylinder, a first rotary clamping cylinder and a lifting clamping cylinder connected to the first tooling base plate and arranged around the first tooling top plate, wherein two edges of the first tooling top plate perpendicular to each other are respectively fixedly connected to a first x-axis stopper and a first y-axis stopper, a plurality of first guide rod cylinders are respectively arranged on two edges of the first tooling top plate opposite to the first x-axis stopper and the first y-axis stopper, one first rotary clamping cylinder is respectively arranged on both sides in the length direction of the first tooling top plate, a movable end of the first rotary clamping cylinder is connected to a fixed fork, and a plurality of lifting clamping cylinders are respectively arranged on both sides in the width direction of the first tooling top plate;

[0007] The second process tooling includes a second tooling base plate, a second tooling top plate connected to the second tooling base plate through a second support plate, and a second guide rod cylinder and a second rotary clamping cylinder connected to the second tooling base plate and arranged around the second tooling top plate, a second x-axis stopper and a second y-axis stopper are fixedly connected to two mutually perpendicular sides of the second tooling top plate, a plurality of second guide rod cylinders are respectively arranged on two sides of the first tooling top plate opposite to the second x-axis stopper and the second y-axis stopper, and a plurality of second rotary clamping cylinders are respectively arranged on both sides of the length direction of the second tooling top plate;

[0008] The third process tooling includes a third tooling base plate, a third tooling top plate connected to the third tooling base plate through a third support plate, and a third guide rod cylinder and a third rotary clamping cylinder connected to the third tooling base plate and arranged around the third tooling top plate. A third x-axis stopper is fixedly connected to one edge in the length direction of the third tooling top plate, and the width of the third tooling top plate is smaller than the width of the base plate of the battery tray.

[0009] Furthermore, the first tooling top plate, the second tooling top plate and the third tooling top plate are respectively provided with notches.

[0010] Furthermore, notches are respectively formed in the middle and at both ends of the first x-axis stopper, the second x-axis stopper and the third x-axis stopper.

[0011] Furthermore, the movable end of the first guide rod cylinder relative to the first x-axis stop block is connected to a first x-axis pad, the first x-axis pad is provided with a notch corresponding to the first x-axis stop block, the movable end of the second guide rod cylinder relative to the second x-axis stop block is connected to a second x-axis pad, the second x-axis pad is provided with a notch corresponding to the second x-axis stop block, the movable end of the third guide rod cylinder relative to the third x-axis stop block is connected to a third x-axis pad, the third x-axis pad is provided with a notch corresponding to the third x-axis stop block, the movable end of the second guide rod cylinder relative to the second y-axis stop block is connected to the first y-axis pad, and the movable ends of the third guide rod cylinder on both sides of the length direction of the third tooling top plate are connected to second y-axis pads.

[0012] Furthermore, there are two second y-axis stops that are arranged at intervals, and the top of the second y-axis stops is arranged to be a stepped structure that matches the top shape of the side panel of the battery tray. Positioning columns that match the mounting holes of the connecting parts of the side panel are respectively arranged between the two second y-axis stops and on the second tooling top plate on both sides.

[0013] Furthermore, the second tooling top plate outside the positioning columns on both sides is respectively provided with a first positioning block that matches the short rounded corners and the long rounded corners of the side plate, and the third tooling top plate outside the third x-axis stop block is respectively provided with a second positioning block that matches the long rounded corners of the side plate.

[0014] Furthermore, a clamp with a movable end is fixedly connected to the second tooling top plate relative to the second y-axis stop block, and the clamp includes a base fixedly connected to the second tooling top plate, a rotatable handle connected to the base, a push rod that moves toward or away from the inner side of the second tooling top plate as the handle rotates, and a sleeve slidably connected to the push rod, and the sleeve is fixedly connected to the base.

[0015] Beneficial effects

[0016] The battery tray friction stir welding processing tooling provided by the present invention fully considers the processing requirements of each of the three processes of processing the battery tray. It can quickly locate the position of the base plate, plug and side plate in each process and fix them. The fixing effect is good, and only manual loading and unloading is required. The fixing and positioning components are all pneumatically controlled, which effectively improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the battery tray;

[0018] Figure 2 It is a structural diagram of the side panel of the battery tray;

[0019] Figure 3 This is a schematic structural diagram of a first process tooling of a friction stir welding tooling for a battery tray provided by an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the installation of the base plate from another perspective of the first process tooling;

[0021] Figure 5 This is one of the partial schematic diagrams of the first process tooling installation base plate;

[0022] Figure 6 This is the second partial schematic diagram of the first process tool installation base plate;

[0023] Figure 7 2 is a schematic structural diagram of a second process tooling of a friction stir welding tooling for a battery tray provided in an embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram of the second process tooling for installing the bottom plate and side panels from another perspective;

[0025] Figure 9 It is a structural diagram of the fixture;

[0026] Figure 10 2 is a schematic structural diagram of a third process tooling of a battery tray friction stir welding tooling provided by an embodiment of the present invention;

[0027] Figure 11 This is a schematic diagram of the installation of the bottom plate and side panels from another perspective of the third process tooling;

[0028] Figure 12 yes Figure 10 Top view of .

[0029] The numbers in the figure represent:

[0030] 01-base plate, 02-plug, 03-side plate, 031-connector, 0311-mounting hole, 032-short fillet, 033-long fillet;

[0031] 1-first process tooling, 101-first tooling bottom plate, 102-first support plate, 103-first tooling top plate, 104-first guide rod cylinder, 105-first rotary clamping cylinder, 106-lifting clamping cylinder, 107-first x-axis stopper, 108-first y-axis stopper, 109-fixed fork, 110-first x-axis spacer;

[0032] 2-second process tooling, 201-second tooling bottom plate, 202-second support plate, 203-second tooling top plate, 204-second guide rod cylinder, 205-second rotary clamping cylinder, 206-second x-axis stopper, 207-second y-axis stopper, 208-second x-axis pad, 209-first y-axis pad, 210-positioning column, 211-first positioning block, 212-clamp, 2121-base, 2122-handle, 2123-top rod, 2124-sleeve;

[0033] 3-third process tooling, 301-third tooling bottom plate, 302-third support plate, 303-third tooling top plate, 304-third guide rod cylinder, 305-third rotary clamping cylinder, 306-third x-axis stopper, 307-third x-axis pad, 308-second y-axis pad, 309-second positioning block. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] See also Figures 1 to 12 The embodiment of the present invention provides a battery tray friction stir welding processing tool, which is used in three processes of processing the battery tray, including a first process tool 1, a second process tool 2 and a third process tool 3.

[0036] The three-step process for manufacturing a battery tray involves welding two bottom plates (01) and the two-side welding between the bottom plate (01) and the plug (02); welding the bottom plate (01) and the side plate (03) on one side; and welding the bottom plate (01) and the side plate (03) on the other side. Tool 1 for the first step is used for welding the two bottom plates (01) and the two-side welding between the bottom plate (01) and the plug (02); Tool 2 for the second step is used for welding the bottom plate (01) and the side plate (03) on one side; and Tool 3 for the third step is used for welding the other side.

[0037] The first process tooling 1 includes a first tooling base plate 101, a first tooling top plate 103 connected to the first tooling base plate 101 through a first support plate 102, and a first guide rod cylinder 104, a first rotary clamping cylinder 105 and a lifting clamping cylinder 106 connected to the first tooling base plate 101 and arranged around the first tooling top plate 103. A first x-axis stopper 107 and a first y-axis stopper 108 are fixedly connected to two mutually perpendicular sides of the first tooling top plate 103, and a plurality of first guide rod cylinders 104 are respectively arranged on the two sides of the first tooling top plate 103 opposite to the first x-axis stopper 107 and the first y-axis stopper 108. A first rotary clamping cylinder 105 is respectively arranged on both sides of the first tooling top plate 103 in the length direction, and the movable end of the first rotary clamping cylinder 105 is connected to a fixed fork 109. A plurality of lifting clamping cylinders 106 are respectively arranged on both sides of the first tooling top plate 103 in the width direction.

[0038] The first tooling top plate 103 is a rectangular structure, and its size is larger than that of the bottom plate 01 of the battery tray. The first x-axis stopper 107 and the first y-axis stopper 108 are used to position the bottom plate 01. First, rotate the first rotary clamping cylinder 105 to a safe position, and then place the bottom plate 01 and the plug 02 on the first tooling top plate 103. Use the first guide rod cylinder 104 to push the bottom plate 01 so that the bottom plate 01 is simultaneously attached to the first x-axis stopper 107 and the first y-axis stopper 108. Then, control the first rotary clamping cylinder 105 to rotate back to above the bottom plate 01, and then control the first rotary clamping cylinder 105 and the lifting clamping cylinder 106 to clamp the bottom plate 01 to achieve positioning and fixation to avoid vibration and displacement during welding.

[0039] The front end of the fixing fork 109 contacts the bottom plate 01 and is aligned with the weld seams of the two bottom plates 01 to be welded. The orthographic projection of the fixing fork 109 has a U-shaped structure, making way for the stirring head of the friction stir welding device.

[0040] In addition, a notch is provided on the first tooling top plate 103 to facilitate the lifting of the bottom plate 01 after welding by a robotic arm or hoisting equipment. Notches are also provided in the middle and at both ends of the first x-axis stopper 107. These notches align with the joint between the bottom plate 01 and the plug 02, making way for the stirring head of the friction stir welding equipment. The movable end of the first guide rod cylinder 104, which is opposite to the first x-axis stopper 107, is connected to the first x-axis pad 110. The first x-axis pad 110 has a notch corresponding to the first x-axis stopper 107. This notch also aligns with the joint between the bottom plate 01 and the plug 02, making way for the stirring head of the friction stir welding equipment.

[0041] After the welding of the two base plates 01 and one side between the base plate 01 and the plug 02 is completed, the first rotary clamping cylinder 105 is rotated to a safe position, the first guide rod cylinder 104 and the lifting clamping cylinder 106 are released, and the welded base plate 01 is lifted by a robotic arm or lifting equipment, and then the base plate 01 is turned over and the other side between the two base plates 01 and the plug 02 is welded in the above manner.

[0042] The second process tooling 2 includes a second tooling base plate 201, a second tooling top plate 203 connected to the second tooling base plate 201 through a second support plate 202, and a second guide rod cylinder 204 and a second rotary clamping cylinder 205 connected to the second tooling base plate 201 and arranged around the second tooling top plate 203. The second x-axis stop block 206 and the second y-axis stop block 207 are fixedly connected to two mutually perpendicular edges of the second tooling top plate 203, and multiple second guide rod cylinders 204 are respectively arranged on the two edges of the first tooling top plate 203 relative to the second x-axis stop block 206 and the second y-axis stop block 207, and multiple second rotary clamping cylinders 205 are respectively arranged on both sides of the second tooling top plate 203 in the length direction.

[0043] The second tooling top plate 203 is a rectangular structure, and its size is larger than the overall size of the battery tray. The second x-axis stop 206 is used to position the bottom plate 01, and the second y-axis stop 207 is used to position the side plate 03 of the battery tray. There are two second y-axis stops 207, which are arranged at intervals. The top of the second y-axis stop 207 is set to a stepped structure that matches the top shape of the side plate 03 of the battery tray, so that the second y-axis stop 207 fits the side plate 03.

[0044] Positioning columns 210 that match the mounting holes 0311 of the connecting parts 031 of the side panels 03 are respectively provided on the second tooling top plate 203 between the two second y-axis blocks 207 and on both sides. When the side panels 03 fit the second y-axis blocks 207, the mounting holes 0311 are plugged with the positioning columns 210.

[0045] The second tooling top plate 203 on the outside of the positioning columns 210 on both sides is respectively provided with first positioning blocks 211 that match the short rounded corners 032 and the long rounded corners 033 of the side panel 03. When the mounting holes 0311 are plugged into the positioning columns 210, the two first positioning blocks 211 respectively fit the short rounded corners 032 and the long rounded corners 033 to achieve the positioning of the side panel 03 on one side.

[0046] After the side plate 03 on one side is positioned, the second rotary clamping cylinder 205 is rotated to a safe position, and then the welded bottom plate 01 is placed on the second tooling top plate 203, and the second guide rod cylinder 204 is used to push the bottom plate 01 toward the second x-axis stopper 206 and the second y-axis stopper 207 until it is in contact with the first positioning block.

[0047] One end of 211 is flush with the inner side 206 of the second x-axis stopper and flush with the edge of the bottom plate 01 so that it is aligned with the side plate 03. After the bottom plate 01 is abutted, the end of the bottom plate 01 is flush with the end of the side plate 03, and the side plate 03 on one side is positioned with the bottom plate 01.

[0048] A clamp 212 with a movable end is fixedly connected to the second tooling top plate 203 relative to the second y-axis stop block 207. The clamp 212 includes a base 2121 fixedly connected to the second tooling top plate 203, a rotatable handle 2122 connected to the base 2121, a top rod 2123 that moves toward or away from the inner side of the second tooling top plate 203 as the handle 2122 rotates, and a sleeve 2124 that is slidably connected to the top rod 2123. The sleeve 2124 is fixedly connected to the base 2121.

[0049] Place the side panel 03 on the other side on the second tooling top plate 203, so that its end and side are respectively against the second x-axis stop block 206 and the bottom plate 01, turn the handle 2122 of the clamp 212 to make the push rod 2123 slide along the sleeve 2124, and the front end of the push rod 2123 presses against the side panel 03 on the other side to make it close to the bottom plate 01. At the same time, the second guide rod cylinder 204 pushes the side surface of the side panel 03 and the outer surface of the connecting piece 031 respectively to realize the positioning of the side panel 03 on the other side.

[0050] After the two side plates 03 and the bottom plate 01 are positioned, the second rotary clamping cylinder 205 is controlled to rotate to the top of the bottom plate 01 to clamp the bottom plate 01 to avoid vibration and displacement during welding.

[0051] In addition, a notch is provided on the second tooling top plate 203 to facilitate the robotic arm or lifting equipment to lift the bottom plate 01 after welding. Notches are also provided in the middle and at both ends of the second x-axis stopper 206. The notches are aligned with the seam between the bottom plate 01 and the side plate 03 to make room for the stirring head of the friction stir welding equipment. The movable end of the second guide rod cylinder 204 relative to the second x-axis stopper 206 is connected to the second x-axis pad 208. The second x-axis pad 208 has a notch corresponding to the second x-axis stopper 206. The notch is also aligned with the seam between the bottom plate 01 and the side plate 03 to make room for the stirring head of the friction stir welding equipment. The movable end of the second guide rod cylinder 204 relative to the second y-axis stopper 207 is connected to the first y-axis pad 209. The first y-axis pad 209 increases the contact area between the movable end of the second guide rod cylinder 204 and the side plate 03, thereby improving the anti-vibration effect.

[0052] After the welding of one side of the bottom plate 01 and the side plate 03 is completed, the second rotary clamping cylinder 205 is rotated to a safe position, the second guide rod cylinder 204 and the clamp 212 are released, and the bottom plate 01 and the side plate 03 after welding are lifted by a robotic arm or lifting equipment, and the bottom plate 01 and the side plate 03 are turned over as a whole and moved to the third process tooling 3.

[0053] The third process tooling 3 includes a third tooling base plate 301, a third tooling top plate 303 connected to the third tooling base plate 301 through a third support plate 302, and a third guide rod cylinder 304 and a third rotary clamping cylinder 305 connected to the third tooling base plate 301 and arranged around the third tooling top plate 303. A third x-axis stopper 306 is fixedly connected to one edge in the length direction of the third tooling top plate 303, and the width of the third tooling top plate 303 is smaller than the width of the base plate 01 of the battery tray.

[0054] The third tooling top plate 303 is a rectangular structure and the width of the third tooling top plate 303 is smaller than the width of the bottom plate 01 of the battery tray. The battery tray is inverted on the third tooling top plate 303, the bottom plate 01 fits the third tooling top plate 303, and the side plate 03 is located on the outside of the third tooling top plate 303.

[0055] The third guide rod cylinder 304 on the side opposite to the third x-axis stop 306 pushes the bottom plate 01 so that the plug 02 is against the third x-axis stop 306 and the long rounded corner 033 on the side plate 03 fits the second positioning block 309. Then the third guide rod cylinder 304 and the third rotary clamping cylinder 305 on both sides of the length direction of the third tooling top plate 303 are controlled to clamp the side plates 03 on both sides respectively to realize the overall positioning and fixation of the battery tray.

[0056] In addition, the third tooling top plate 303 has a notch to facilitate the lifting of the battery tray after welding by a robotic arm or lifting equipment. The third x-axis block 306 also has notches in the middle and at both ends. These notches align with the seam between the bottom plate 01 and the side plate 03, making way for the stirring head of the friction stir welding equipment. The movable end of the third guide rod cylinder 304, which is opposite to the third x-axis block 306, is connected to a third x-axis pad 307. The third x-axis pad 307 has a notch corresponding to the third x-axis block 306, which also aligns with the seam between the bottom plate 01 and the side plate 03, making way for the stirring head of the friction stir welding equipment. The movable ends of the third guide rod cylinder 304 on both sides of the third tooling top plate 303 are connected to second y-axis pads 308. These second y-axis pads 308 increase the contact area between the third guide rod cylinder 304 and the side plate 03, improving vibration resistance.

[0057] After the bottom surface of the bottom plate 01 and the side plate 03 are welded, the third rotary clamping cylinder 305 is rotated to a safe position, the third guide rod cylinder 304 is released, and the battery tray after welding is lifted by a robotic arm or lifting equipment to complete the welding.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. The battery tray friction stir welding processing tool is used in the three processes of processing the battery tray, which is characterized by: Including the first process tooling, the second process tooling and the third process tooling; The first process tooling includes a first tooling base plate, a first tooling top plate connected to the first tooling base plate through a first support plate, and a first guide rod cylinder, a first rotary clamping cylinder and a lifting clamping cylinder connected to the first tooling base plate and arranged around the first tooling top plate, wherein two edges of the first tooling top plate perpendicular to each other are respectively fixedly connected to a first x-axis stopper and a first y-axis stopper, a plurality of first guide rod cylinders are respectively arranged on two edges of the first tooling top plate opposite to the first x-axis stopper and the first y-axis stopper, one first rotary clamping cylinder is respectively arranged on both sides in the length direction of the first tooling top plate, a movable end of the first rotary clamping cylinder is connected to a fixed fork, and a plurality of lifting clamping cylinders are respectively arranged on both sides in the width direction of the first tooling top plate; The second process tooling includes a second tooling base plate, a second tooling top plate connected to the second tooling base plate through a second support plate, and a second guide rod cylinder and a second rotary clamping cylinder connected to the second tooling base plate and arranged around the second tooling top plate, a second x-axis stopper and a second y-axis stopper are fixedly connected to two mutually perpendicular sides of the second tooling top plate, a plurality of second guide rod cylinders are respectively arranged on two sides of the first tooling top plate opposite to the second x-axis stopper and the second y-axis stopper, and a plurality of second rotary clamping cylinders are respectively arranged on both sides of the length direction of the second tooling top plate; The third process tooling includes a third tooling base plate, a third tooling top plate connected to the third tooling base plate through a third support plate, and a third guide rod cylinder and a third rotary clamping cylinder connected to the third tooling base plate and arranged around the third tooling top plate. A third x-axis stopper is fixedly connected to one edge in the length direction of the third tooling top plate, and the width of the third tooling top plate is smaller than the width of the base plate of the battery tray.

2. The battery tray friction stir welding tool according to claim 1, characterized in that: The first tooling top plate, the second tooling top plate and the third tooling top plate are respectively provided with notches.

3. The battery tray friction stir welding tool according to claim 1, characterized in that: Notches are respectively formed in the middle and at both ends of the first x-axis stopper, the second x-axis stopper and the third x-axis stopper.

4. The battery tray friction stir welding tool according to claim 3, characterized in that: The movable end of the first guide rod cylinder relative to the first x-axis stopper is connected to the first x-axis pad, and the first x-axis pad is provided with a notch corresponding to the first x-axis stopper. The movable end of the second guide rod cylinder relative to the second x-axis stopper is connected to the second x-axis pad, and the second x-axis pad is provided with a notch corresponding to the second x-axis stopper. The movable end of the third guide rod cylinder relative to the third x-axis stopper is connected to the third x-axis pad, and the third x-axis pad is provided with a notch corresponding to the third x-axis stopper. The movable end of the second guide rod cylinder relative to the second y-axis stopper is connected to the first y-axis pad, and the movable ends of the third guide rod cylinder on both sides of the length direction of the third tooling top plate are connected to the second y-axis pad.

5. The battery tray friction stir welding tool according to claim 1, characterized in that: There are two second y-axis stops that are arranged at intervals, and the top of the second y-axis stops is arranged to be a stepped structure that matches the top shape of the side panel of the battery tray. Positioning columns that match the mounting holes of the connecting parts of the side panel are respectively arranged between the two second y-axis stops and on the second tooling top plate on both sides.

6. The battery tray friction stir welding tool according to claim 5, characterized in that: The second tooling top plate outside the positioning columns on both sides is respectively provided with a first positioning block that matches the short rounded corners and the long rounded corners of the side plate, and the third tooling top plate outside the third x-axis stop is respectively provided with a second positioning block that matches the long rounded corners of the side plate.

7. The battery tray friction stir welding tool according to claim 1, characterized in that: A clamp with a movable end is fixedly connected to the second tooling top plate relative to the second y-axis stop block, and the clamp includes a base fixedly connected to the second tooling top plate, a rotatable handle connected to the base, a push rod that moves toward or away from the inner side of the second tooling top plate as the handle rotates, and a sleeve slidably connected to the push rod, and the sleeve is fixedly connected to the base.

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