Swing arm transfer module

Abstract

The invention belongs to the technical field of hosiery machines, and particularly relates to a swing arm transfer module which solves the problem that a single-shaft structure is poor in stability of control over lifting and swinging of a swing arm. The swing arm transfer module comprises a base and a stand column, a stand column rotation driving mechanism is arranged between the base and the stand column, the stand column is sleeved with a lifting sleeve, a threaded screw lifting mechanism is arranged between the lifting sleeve and the stand column, a guide seat located on one side is fixed to the stand column, and a lifting guide rod parallel to the stand column is arranged in a guide hole of the guide seat in a penetrating mode. The lifting guide rod is fixedly connected with the lifting sleeve, the lifting sleeve is sleeved with a lower swing arm and an upper swing arm, the lower swing arm is fixedly connected with the lifting sleeve, the upper swing arm is movably connected with the lifting sleeve, a clutch assembly is arranged between the upper swing arm and the lower swing arm, and an upper swing arm lifting mechanism is arranged between the upper swing arm and the lifting guide rod. An upper swing arm linkage rotation reset mechanism is arranged between the upper swing arm lifting mechanism and the upper swing arm. The double-shaft structure improves the stability of lifting and rotating control of the swing arm, and is convenient to assemble and maintain.

Description

Technical Field

[0001] The invention belongs to the technical field of sock machines, and in particular relates to a swing arm transfer module. Background Art

[0002] As an important equipment in the textile industry, one of the core functions of the sock machine is to realize the automatic knitting and transfer of socks. In the production process of the sock machine, the swing arm transfer device is a key component, which is used to transfer the knitted socks from the knitting station to the subsequent processing station.

[0003] In the prior art, most swing arm transfer devices set the upper swing arm and the lower swing arm on a column, and the structure for controlling the synchronous lifting or rotation of the upper and lower swing arms, and the structure for controlling the rotation or lifting of the upper swing arm relative to the lower swing arm are all set on the column, that is, the relevant swinging and lifting functions are realized through a single axis and the structure thereon. This has a high integration complexity for the relevant structures, is inconvenient for early assembly and later maintenance, and may also have poor stability problems for the lifting guide and the swing transmission effect. Summary of the invention

[0004] The purpose of the present invention is to propose a swing arm transfer module in view of the above-mentioned problems existing in the prior art.

[0005] In order to achieve the purpose of the invention, the following technical solutions can be used: A swing arm transfer module comprises a base and a column, a column rotation driving mechanism is provided between the base and the column, a lifting sleeve is provided on the column, a threaded screw lifting mechanism is provided between the lifting sleeve and the column, a guide seat located on one side is fixed to the column, a lifting guide rod parallel to the column is passed through the guide hole of the guide seat, the lifting guide rod is fixedly connected to the lifting sleeve, a lower swing arm and an upper swing arm are provided on the lifting sleeve, the lower swing arm is fixedly connected to the lifting sleeve, the upper swing arm is movably connected to the lifting sleeve, a clutch assembly is provided between the upper swing arm and the lower swing arm, an upper swing arm lifting mechanism is provided between the upper swing arm and the lifting guide rod, an upper swing arm linkage rotation resetting mechanism which can drive the upper swing arm to move axially and rotate and reset is provided between the upper swing arm lifting mechanism and the upper swing arm

[0006] The main body of the present invention is composed of a base, a column, and an upper swing arm and a lower swing arm arranged on the column through a lifting sleeve. The column rotation drive mechanism is used to drive the rotation of the column to achieve overall swing control of the upper swing arm and the lower swing arm, and the threaded screw lifting mechanism is used to control the lifting action of the lifting sleeve to achieve overall lifting control of the upper swing arm and the lower swing arm. The lifting mechanism of the lifting arm is a key factor in the lifting of the lifting arm, and the lifting and lowering mechanisms are related to the lifting and lowering of the lifting arm. The related structures for installation, lifting control and rotation control of the upper swing arm are arranged on the column and the lifting guide rod. The parallel double-axis structure makes the control and transmission of the upper swing arm more stable, and the spatial structure is balanced.

[0007] In the above-mentioned swing arm transfer module, the upper swing arm lifting mechanism includes an upper swing arm driving connecting piece mounted on the lifting guide rod, a lifting driving assembly is provided between the upper swing arm driving connecting piece and the lifting guide rod, the upper swing arm driving connecting piece is connected to the upper swing arm, and an upper swing arm linkage rotation resetting mechanism is provided between the upper swing arm driving connecting piece and the upper swing arm linkage rotation resetting mechanism, which can drive the upper swing arm to move axially and rotate and reset it.

[0008] The upper swing arm drive connecting piece is sleeved on the lifting guide rod and can move axially. The upper swing arm drive connecting piece is connected to the upper swing arm and can be lifted and lowered synchronously. The lifting drive assembly is used to drive the upper swing arm drive connecting piece to lift and lower, thereby achieving the effect of controlling the lifting and lowering of the upper swing arm. The upper swing arm linked rotation and reset mechanism is used for the transmission connection between the upper swing arm drive connecting piece and the upper swing arm, and at the same time gives the upper swing arm a tendency to rotate away from the lower swing arm, which is used to rotate and reset the upper swing arm when the clutch assembly is released.

[0009] In the above-mentioned swing arm transfer module, the lifting drive assembly includes a driving body capable of axial movement and arranged in the guide rod shaft hole of the lifting guide rod, a linear driving unit is arranged between the driving body and the lifting guide rod, the driving body is provided with N radial shafts distributed along the circumferential direction, N ≥ 1, the lifting guide rod is provided with axial strip holes that can make the guide rod shaft hole radially connected with the outside and are equal to the number of radial shafts, the radial shafts are penetrated by the axial strip holes and correspond one to one, and the outer ends of the radial shafts are connected to the upper swing arm driving connector.

[0010] An axially extending guide rod shaft hole is provided inside the lifting guide rod, and the driving body slides in the guide rod shaft hole. The radial shaft on the driving body passes through the axial strip hole and is connected to the upper swing arm driving connector. The axial strip hole extends vertically to adapt to the lifting and lowering of the upper swing arm driving connector and limit the circumferential rotation of the driving body. The linear driving unit is used to provide the driving force for the lifting and lowering of the driving body. Furthermore, a wear-resistant guide sleeve is provided between the upper swing arm driving connector and the lifting guide rod to ensure the stable lifting and lowering of the upper swing arm driving connector on the lifting guide rod and increase the wear resistance.

[0011] In the above-mentioned swing arm transfer module, the upper swing arm linkage rotation reset mechanism includes an annular groove arranged on the upper swing arm, the annular groove is arranged coaxially with the column, at least two first rolling bodies are arranged in the annular groove, which are evenly distributed along the circumference and can slide in the annular groove, and the first rolling bodies are connected to the upper swing arm drive connection piece through the rolling body seat, and an upper swing arm rotation reset component is also arranged between the lifting guide rod and the lifting sleeve. The rotation reset component includes a spring bracket arranged on the upper swing arm drive connection piece and located between the lifting guide rod and the lifting sleeve, and a rotation reset spring is arranged between the spring bracket and the annular groove.

[0012] The first rolling body on the upper swing arm driving connection piece is limited in the annular groove, and the upper swing arm can rotate relative to the upper swing arm driving connection piece, but the lifting and lowering are synchronous. Of course, the sliding contact between the first rolling body and the annular groove can also be a rolling contact, which reduces wear and reduces rotation resistance. The upper swing arm rotation reset assembly is used to specifically provide the driving force required for the upper swing arm to reset and rotate. One end of its rotation reset spring is connected to the upper swing arm, and the other end is connected to the upper swing arm driving connection piece through a spring bracket. A coaxial spring groove is provided below the annular groove. The main section of the rotation reset spring is wound around the spring groove, which can pull the upper swing arm to rotate in a direction away from the lower swing arm.

[0013] Specifically, the spring bracket is L-shaped, and its horizontal section can be detachably fixed to the side of the upper swing arm driving connecting piece away from the winding part of the rotary return spring. A fixing column is arranged in the spring groove, and the two ends of the rotary return spring are respectively connected to the fixing column and the vertical section of the spring bracket.

[0014] In the above-mentioned swing arm transfer module, the rolling body seat is arc-shaped and partially embraces the annular groove, the first rolling body is slidably connected to the side walls of the annular groove, the diameter of the first rolling body is adapted to the width of the annular groove, and at least one second rolling body is provided between the rolling body seat and the annular groove and is in sliding contact with the bottom of the annular groove.

[0015] The first rolling body is arranged along the radial direction of the annular groove, and is detachably arranged on the inner side wall of the rolling body seat through a connecting shaft. The upper and lower sides of the first rolling body are slidably connected to the side walls of the annular groove to ensure the stability of the lifting control and avoid vertical jumping. The axial direction of the second rolling body is parallel to the axial direction of the annular groove. A rolling body setting hole is opened on the side of the rolling body seat. The second rolling body is rotatably connected to the rolling body setting hole through the connecting shaft. The circumferential surface of the second rolling body is connected to the bottom of the annular groove to ensure the smooth rotation of the annular groove relative to the rolling body seat. Furthermore, the first rolling body and the second rolling body can be cylindrical rollers or bearings, which roll smoothly.

[0016] In the above-mentioned swing arm transfer module, the linear drive unit includes a linear drive fixed to the top of the lifting guide rod, and the linear drive is connected to the drive body through the lifting drive shaft; A first auxiliary lifting spring is arranged between the driving body and the bottom of the lifting guide rod, the lower end of the first auxiliary lifting spring abuts against the first plug at the lower end of the guide rod shaft hole, and the upper end abuts against the driving body.

[0017] The two ends of the lifting drive shaft are respectively detachably connected to the output end of the linear drive and the top of the driving body, which is equivalent to extending the output shaft of the linear drive. The first auxiliary lifting spring provides an upward elastic thrust to the driving body, reduces the load of the linear drive, and reduces the driving force cost. The guide rod shaft hole of the lifting guide rod passes axially, and the lower end opening is detachably closed by the first plug to prevent the entry of debris and facilitate the disassembly and maintenance of the first auxiliary lifting spring.

[0018] In the above-mentioned swing arm transfer module, the lifting guide rod is fixed to the lifting sleeve through the upper connecting seat and the lower connecting seat, the upper swing arm and the lower swing arm are located between the upper connecting seat and the lower connecting seat, and the guide seat is located below the lower connecting seat; A lifting and rotating sleeve is arranged between the upper swing arm and the lifting sleeve, the upper swing arm is fixed on the lifting and rotating sleeve, an annular clearance gap is left between the lower swing arm and the lifting sleeve, and the lower end of the lifting and rotating sleeve is arranged in the annular clearance gap.

[0019] The lifting guide rod is fixed to the lifting sleeve by two connecting seats, and the structure is stable. The lifting rotating sleeve can be lifted and rotated on the lifting sleeve. The upper swing arm is arranged on the lifting rotating sleeve to avoid wear of the mounting sleeve hole of the upper swing arm. A corresponding wear-resistant layer can also be arranged between the lifting sleeve and the lifting rotating sleeve. The annular clearance gap is used for radial clearance of the lifting rotating sleeve. The spacing of the gap is adapted to the thickness of the lifting rotating sleeve.

[0020] Furthermore, the guide seat is sleeved and fixed on the column through an annular mounting portion, and a D-shaped guide ring is also provided on the guide seat. The guide ring includes an arc-shaped portion, and a strip-shaped portion that is detachably arranged horizontally at the opening of the arc-shaped portion. The guide hole is formed between the strip-shaped portion and the arc-shaped portion. A third rolling body is rotatably connected to the inner side of the strip-shaped portion and the inner side wall of the arc-shaped portion. The third rolling body is rollingly connected to the lifting guide rod and can rotate with the lifting and lowering of the lifting guide rod.

[0021] The mounting portion is sleeved on the column and fixed on its flange portion. The guide ring is D-shaped, and its vertical ends, namely the strip portion and the arc-shaped portion, are detachably fixed, which is convenient for the disassembly and assembly of the lifting guide rod. The axial direction of the third rolling body is perpendicular to the axial direction of the lifting guide rod, and its circumferential surface rolls on the lifting guide rod, ensuring the stable positioning of the lifting guide rod in the guide hole, and also reducing the resistance of the lifting guide rod to the lifting action relative to the column.

[0022] In the above-mentioned swing arm transfer module, the column rotation drive mechanism includes a first rotation drive arranged on the base, the column is rotatably connected to the column mounting hole of the base, and a worm gear is provided at the lower end, and the output end of the first rotation drive is connected to the worm gear through a worm; the upper and lower ends of the column mounting hole are rotatably connected to the column through an upper rolling bearing and a lower rolling bearing respectively.

[0023] The first rotary driver is arranged on the base through the motor seat, and the worm on it penetrates into the base and intersects with the column mounting hole. The lower part of the column is rotatably connected to the base. A worm wheel is also arranged at the lower end of the column. The worm wheel meshes with the worm. The first rotary driver drives the worm to rotate and thus drives the circumferential rotation of the column. The lower part of the column is vertically rotatably connected in the column mounting hole through the upper rolling bearing and the lower rolling bearing.

[0024] As an optimization, the column is provided with an annular oil guide cover located between the upper rolling bearing and the worm gear, the oil guide cover includes an oil guide slope that is lower on the outside and higher on the inside, an oil gap is provided between the oil guide slope and the inner wall of the column mounting hole, and the oil gap is located above the meshing point of the worm gear and the worm.

[0025] An oil guide cover is also provided above the worm gear. The oil guide cover is annular, and the circumferential outer side is lower than the circumferential inner side, forming a downward-sloping oil guide slope. The radial outer side of the oil guide slope is not connected to the inner wall of the column mounting hole. The oil gap between them allows the oil to flow down. The matching point of the worm and the worm gear is located below the oil gap. Lubricating oil can be added from above the upper rolling bearing, and flow to the meshing matching point through the upper rolling bearing and the oil gap to ensure smooth transmission.

[0026] In the above-mentioned swing arm transfer module, the threaded screw lifting mechanism includes a nut arranged at the top of the column, a screw is threaded in the nut, the upper end of the screw is connected to the second rotary driver, the second rotary driver is connected to the lifting sleeve through the driver seat, and a rolling bearing is provided between the screw rod section and the driver seat or the lifting sleeve; An axially extending center hole is provided on the column, the nut is detachably fixed to the upper end of the center hole, the lower end of the screw rod extends into the center hole, and a second auxiliary lifting spring is provided between the bottom of the center hole and the screw rod. The upper end of the second auxiliary lifting spring is connected to the bottom of the screw rod through a plane bearing, and the lower end abuts against the second plug at the lower end of the center hole.

[0027] The center hole axially passes through the column, the nut is fixed to the upper end of the center hole, the screw is meshed with the screw on the lifting sleeve, and the second rotary driver drives the lifting sleeve to move relative to the column by rotating the driving screw. The second auxiliary lifting spring exerts an upward elastic thrust on the lifting sleeve to balance part of the gravity of the lifting sleeve and its upper components, reducing the driving force cost. The lower end of the center hole is detachably closed by the second plug to prevent debris from entering, and also facilitates the disassembly and maintenance of the second auxiliary lifting spring.

[0028] In the above-mentioned swing arm transfer module, the clutch assembly includes an anti-rotation column and an anti-rotation hole respectively arranged on the upper swing arm and the lower swing arm and extending axially. The anti-rotation column can be inserted into the anti-rotation hole when the upper swing arm and the lower swing arm are at the same rotation angle and vertically close to each other.

[0029] The anti-rotation column and the anti-rotation hole are at the same distance from the axis of the column. When the upper swing arm and the lower swing arm rotate to the same angle, the upper swing arm and the lower swing arm are exactly located on the same vertical line. As the upper swing arm and the lower swing arm approach vertically, the anti-rotation column is inserted into the anti-rotation hole and rotated to a limit position. The outer diameter of the anti-rotation column is adapted to the inner diameter of the anti-rotation hole.

[0030] In the above-mentioned swing arm transfer module, a sensor rack is provided on the guide seat, and a height sensing component located on the side of the lifting guide rod is detachably provided in the vertical strip hole of the sensor rack. The height sensing component includes a first sensor located above the guide seat, and a second sensor located below the guide seat. The first sensor is located on the side of the lifting path of the lower connecting seat, and the lower sensor is located on the side of the lifting path at the bottom end of the lifting guide rod.

[0031] The sensor frame is fixed to the side of the guide seat by bolts. The first sensor on it is set horizontally to determine the lifting height by detecting whether the lower connecting seat passes through. The second sensor is also set horizontally to determine the lifting height by detecting whether the bottom end of the lifting guide rod passes through the side. It also serves as a warning of the maximum lifting height of the lifting guide rod to prevent the lifting guide rod from falling out of the guide hole. The first sensor and the second sensor can be laser sensors. The specific structure and detection principle are common knowledge and will not be elaborated in detail.

[0032] In the above-mentioned swing arm transfer module, the base is provided with a swing angle sensor assembly located below the guide seat, the swing angle sensor assembly includes at least two third sensors distributed circumferentially, the third sensors are detachably fixed to the side of the base through connecting plates, and the guide seat rotates between the third sensors.

[0033] The swing angle sensor assembly is used to detect the rotation angle of the column, which is specifically realized by two vertically arranged third sensors. The third sensors are located below the guide seat and face the guide seat. The guide seat rotates between the third sensors with the column. The third sensor detects whether the guide ring of the guide seat passes by to realize the corresponding swing angle position judgment. The third sensor can be a laser sensor. Its specific structure and detection principle are common knowledge and will not be elaborated in detail.

[0034] Compared with the prior art, the present invention mainly has the following advantages: 1. The present invention has a lifting guide rod arranged in parallel on the side of the column. The lifting guide rod is fixedly connected to the lifting sleeve and can be lifted and lowered synchronously with the lifting sleeve. The upper swing arm lifting mechanism on the lifting guide rod is used to provide the driving force for the upper swing arm to lift and lower the lower swing arm, which makes the lifting and lowering control of the upper swing arm more stable and convenient for processing and maintenance. The upper swing arm linkage rotation reset mechanism connects the upper swing arm and the upper swing arm lifting mechanism to realize the transmission of the lifting and lowering driving force between them to control the lifting and lowering action of the upper swing arm. When the clutch assembly releases the rotation limit of the upper swing arm and the lower swing arm, the upper swing arm linkage rotation reset mechanism can also drive the upper swing arm to rotate horizontally. The relevant structures of the installation, lifting control and rotation control of the upper swing arm are arranged on the column and the lifting guide rod. The parallel double-axis structure makes the control and transmission of the upper swing arm more stable, and the spatial structure is balanced.

[0035] 2. The driving body slides in the guide rod shaft hole, and the radial shaft on the driving body passes through the axial strip hole to be connected to the upper swing arm driving connector. The axial strip hole extends vertically to adapt to the lifting and lowering of the upper swing arm driving connector and at the same time limit the circumferential rotation of the driving body.

[0036] 3. The first rolling body on the upper swing arm driving connecting piece is limited in the annular groove. The upper swing arm and the upper swing arm driving connecting piece rise and fall synchronously, but can rotate relative to each other. One end of the rotary return spring is connected to the upper swing arm, and the other end is connected to the upper swing arm driving connecting piece through a spring bracket. The main section of the rotary return spring is wound around the spring groove, which can pull the upper swing arm to rotate in the direction away from the lower swing arm.

[0037] 4. The first rolling body is arranged along the radial direction of the annular groove, and its upper and lower sides are slidably connected with the side walls of the annular groove to ensure the stability of the lifting control and avoid vertical jumping. The axial direction of the second rolling body is parallel to the axial direction of the annular groove, and its circumferential surface is connected with the bottom of the annular groove to ensure the smooth rotation of the annular groove relative to the rolling body seat.

[0038] 5. The first auxiliary lifting spring provides an upward elastic thrust to the driving body, reduces the load of the linear actuator, and reduces the driving force cost. The guide rod shaft hole of the lifting guide rod passes axially, and its lower end opening is detachably closed by the first plug to prevent the entry of debris and facilitate the disassembly and maintenance of the first auxiliary lifting spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the overall structure provided by the present invention; Figure 2 It is a front view schematic diagram provided by the present invention; Figure 3 yes Figure 2 Schematic diagram of the cross section at AA in the middle; Figure 4 yes Figure 2 Schematic diagram of the cross section at the middle BB; Figure 5 It is a structural schematic diagram of the upper swing arm linkage rotation reset mechanism provided by the present invention; Figure 6 It is a structural schematic diagram of the guide seat provided by the present invention; Figure 7 It is a structural schematic diagram of the upper connecting seat and the lower connecting seat provided by the present invention.

[0040] In the figure, base 1, column 2, column rotation drive mechanism 3, lifting sleeve 4, threaded screw lifting mechanism 5, guide seat 6, guide hole 7, lifting guide rod 8, lower swing arm 9, upper swing arm 10, clutch assembly 11, upper swing arm lifting mechanism 12, upper swing arm linkage rotation reset mechanism 13, upper swing arm drive connector 14, lifting drive assembly 15, guide rod shaft hole 16, drive body 17, linear drive unit 18, radial shaft 19, axial strip hole 20, wear-resistant guide sleeve 21, annular groove 22, first rolling body 23, rolling body seat 24, spring bracket 25, rotation reset spring 26, second rolling body 27, linear drive 28, lifting drive shaft 29, first auxiliary lifting spring 30, first plug 31, upper connecting seat 32, lower connecting seat 33, lifting The descending rotating sleeve 34, the annular clearance gap 35, the mounting portion 36, the guide ring 37, the arc-shaped portion 38, the strip-shaped portion 39, the third rolling body 40, the first rotating driver 41, the column mounting hole 42, the worm wheel 43, the worm 44, the upper rolling bearing 45, the lower rolling bearing 46, the spring groove 49, the nut 50, the screw 51, the second rotating driver 52, the driver seat 53, the rolling bearing 54, the center hole 55, the second auxiliary lifting spring 56, the plane bearing 57, the second plug 58, the anti-rotation column 59, the anti-rotation hole 60, the sensor frame 61, the vertical strip hole 62, the height sensor assembly 63, the first sensor 64, the second sensor 65, the swing angle sensor assembly 66, the third sensor 67, the connecting piece 68, and the upper swing arm rotation reset assembly 69. DETAILED DESCRIPTION

[0041] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0042] Specific implementation examples Figure 1-7 As shown, the swing arm transfer module includes a base 1 and a column 2, a column rotation drive mechanism 3 is provided between the base 1 and the column 2, a lifting sleeve 4 is sleeved on the column 2, a threaded screw lifting mechanism 5 is provided between the lifting sleeve 4 and the column 2, a guide seat 6 located on one side is fixed to the column 2, a lifting guide rod 8 parallel to the column 2 is passed through a guide hole 7 of the guide seat 6, the lifting guide rod 8 is fixedly connected to the lifting sleeve 4, a lower swing arm 9 and an upper swing arm 10 are sleeved on the lifting sleeve 4, the lower swing arm 9 is fixedly connected to the lifting sleeve 4, the upper swing arm 10 is movably connected to the lifting sleeve 4, a clutch assembly 11 is provided between the upper swing arm 10 and the lower swing arm 9, an upper swing arm lifting mechanism 12 is provided between the upper swing arm 10 and the lifting guide rod 8, and an upper swing arm linkage rotation reset mechanism 13 which can drive the upper swing arm 10 to move axially and rotate and reset it is provided between the upper swing arm lifting mechanism 12 and the upper swing arm 10.

[0043] Specifically, the column rotation drive mechanism 3 is used to drive the rotation of the column 2 to achieve overall swing control of the upper swing arm 10 and the lower swing arm 9, and the threaded screw lifting mechanism 5 is used to control the lifting action of the lifting sleeve 4 to achieve overall lifting control of the upper swing arm 10 and the lower swing arm 9. In particular, a lifting guide rod 8 is arranged in parallel on the side of the column 2. The lifting guide rod 8 is fixedly connected to the lifting sleeve 4 and can be lifted and lowered synchronously with the lifting sleeve 4. The upper swing arm lifting mechanism 12 on the lifting guide rod 8 is used to provide a driving force for the lifting action of the upper swing arm 10 relative to the lower swing arm 9, which makes the lifting control of the upper swing arm 10 more stable and convenient for processing and maintenance. The upper swing arm linkage rotation reset mechanism 13 connects the upper swing arm 10 and the upper swing arm lifting mechanism 12 to achieve the transmission of the lifting driving force between them to control the upper swing arm. When the upper swing arm 10 and the lower swing arm 9 are in the same swinging direction and vertically close to each other, the clutch assembly 11 cooperates to limit the relative rotation of the upper swing arm 10 and the lower swing arm 9. When the upper swing arm 10 is vertically away from the lower swing arm 9, the clutch assembly 11 releases the rotation limit of the upper swing arm 10 and the lower swing arm 9. At this time, the upper swing arm linkage rotation reset mechanism 13 can drive the upper swing arm 10 to rotate horizontally, and the wire pressing disk at the front end of the upper swing arm 10 can be away from the transfer disk at the front end of the lower swing arm 9. The relevant structures of the installation, lifting control and rotation control of the upper swing arm 10 are arranged on the column 2 and the lifting guide rod 8. The parallel double-axis structure makes the control and transmission of the upper swing arm 10 more stable, and the spatial structure is balanced.

[0044] like Figure 1 , 2 As shown in Figures 3 and 5, the upper swing arm lifting mechanism 12 includes an upper swing arm driving connector 14 mounted on the lifting guide rod 8, a lifting driving assembly 15 is provided between the upper swing arm driving connector 14 and the lifting guide rod 8, the upper swing arm driving connector 14 is connected to the upper swing arm 10, and an upper swing arm linkage rotation reset mechanism 13 is provided between the upper swing arm driving connector 14 and the upper swing arm linkage rotation reset mechanism 13, which can drive the upper swing arm 10 to move axially and rotate and reset it. The lifting drive assembly 15 includes a driving body 17 capable of axial movement and arranged in the guide rod shaft hole 16 of the lifting guide rod 8. A linear driving unit 18 is arranged between the driving body 17 and the lifting guide rod 8. Two radial shafts 19 distributed along the circumferential direction are arranged on the driving body 17. The lifting guide rod 8 is provided with axial strip holes 20 that enable the guide rod shaft hole 16 to be radially connected with the outside and are equal to the number of radial shafts 19. The radial shafts 19 are penetrated by the axial strip holes 20 and correspond one to one. The outer ends of the radial shafts 19 are connected to the upper swing arm driving connector 14.

[0045] Specifically, the upper swing arm driving connector 14 is sleeved on the lifting guide rod 8 and can move axially up and down. The upper swing arm driving connector 14 is connected to the upper swing arm 10 and is lifted and lowered synchronously. The lifting drive assembly 15 is used to drive the upper swing arm driving connector 14 to lift and lower, thereby achieving the effect of controlling the lifting and lowering of the upper swing arm 10. The upper swing arm linkage rotation reset mechanism 13 is used for the transmission connection between the upper swing arm driving connector 14 and the upper swing arm 10, and also gives the upper swing arm 10 a tendency to rotate away from the lower swing arm 9, which is used to rotate and reset the upper swing arm 10 when the clutch assembly 11 is released. An axially extending guide rod shaft hole 16 is provided inside the lifting guide rod 8, and the driving body 17 slides in the guide rod shaft hole 16. The radial shaft 19 on the driving body 17 passes through the axial strip hole 20 and is connected to the upper swing arm driving connector 14. The axial strip hole 20 extends vertically, adapting to the lifting and lowering of the upper swing arm driving connector 14, and limiting the circumferential rotation of the driving body 17. The linear drive unit 18 is used to provide the driving force for the lifting and lowering of the driving body 17. Furthermore, a wear-resistant guide sleeve 21 is provided between the upper swing arm driving connector 14 and the lifting guide rod 8 to ensure stable lifting of the upper swing arm driving connector 14 on the lifting guide rod 8 and increase wear resistance.

[0046] In this embodiment, a radial hole is provided through the side wall of the upper swing arm connecting member 14, a radial through hole is provided through the driving body 17, a radial through hole is provided through the middle section of the radial shaft 19, and both ends pass through the axial strip holes and are provided in the radial holes, and the radial shaft 19 and the radial through hole are tightly fitted and plugged. The lower end of the lifting drive shaft 29 is detachably fixed to the top surface of the driving body 17 by means of threads.

[0047] like Figure 1 , 4 As shown in Figures 5 and 6, the upper swing arm linkage rotation reset mechanism 13 includes an annular groove 22 provided on the upper swing arm 10, the annular groove 22 is coaxially arranged with the column 2, at least two first rolling bodies 23 are arranged in the annular groove 22, which are evenly distributed in the circumferential direction and can slide in the annular groove 22, the first rolling body 23 is connected to the upper swing arm drive connector 14 through a rolling body seat 24, an upper swing arm rotation reset assembly 69 is also provided between the lifting guide rod 8 and the lifting sleeve 4, the rotation reset assembly 69 includes a spring bracket 25 provided on the upper swing arm drive connector 14 and located between the lifting guide rod 8 and the lifting sleeve 4, and a rotation reset spring 26 is provided between the spring bracket 25 and the annular groove 22. The rolling body seat 24 is arc-shaped and partially surrounds the annular groove 22, the first rolling body 23 is slidably connected to the side walls on both sides of the annular groove 22, the diameter of the first rolling body 23 is adapted to the width of the annular groove 22, and a second rolling body 27 is provided between the rolling body seat 24 and the annular groove 22 to be in sliding contact with the bottom of the annular groove 22.

[0048] Specifically, the first rolling body 23 on the upper swing arm driving connector 14 is limited in the annular groove 22, and the upper swing arm 10 can rotate relative to the upper swing arm driving connector 14, but the lifting and lowering are synchronous. The first rolling body 23 is a cylindrical roller, and its outer ring is in rolling contact with the side wall of the annular groove 22. One end of the rotary reset spring 26 is connected to the upper swing arm 10, and the other end is connected to the upper swing arm driving connector 14 through the spring bracket 25. A coaxial spring groove is provided below the annular groove 22. The main section of the rotary reset spring 26 is wound in the spring groove 49, and can pull the upper swing arm 10 to rotate in the direction away from the lower swing arm 9. The first rolling body 23 is arranged along the radial direction of the annular groove 22, and is installed on the inner side wall of the rolling body seat 24 through the roller shaft. The roller shaft is detachably fixed to the screw hole on the inner side of the rolling body seat 24 through a thread. The upper and lower sides of the first rolling body 23 are connected to the side walls of the annular groove 22 to ensure the stability of the lifting control and avoid vertical jumping. The second rolling body 27 is a cylindrical roller, and its axial direction is parallel to the axial direction of the annular groove 22. A rolling body setting hole is opened on the side of the rolling body seat 24. The second rolling body 27 is rotatably connected to the rolling body setting hole through a connecting shaft. The circumferential surface of the second rolling body 27 is connected to the bottom of the annular groove 22 to ensure smooth rotation of the annular groove 22 relative to the rolling body seat 24.

[0049] In this embodiment, the spring bracket 25 is L-shaped, and its horizontal section is detachably fixed to the side of the upper swing arm driving connecting member 14 away from the winding part of the rotation return spring 26. A fixing column is arranged in the spring groove 49, and the two ends of the rotation return spring 26 are respectively connected to the fixing column and the vertical section of the spring bracket 25. The fixing column is detachably fixed in the spring groove 49 by a threaded structure.

[0050] like Figure 1-3 As shown, the linear drive unit 18 includes a linear drive 28 fixed on the top of the lifting guide rod 8, and the linear drive 28 is connected to the driving body 17 through the lifting drive shaft 29; a first auxiliary lifting spring 30 is arranged between the driving body 17 and the bottom of the lifting guide rod 8, and the lower end of the first auxiliary lifting spring 30 abuts against the first plug 31 at the lower end of the guide rod shaft hole 16, and the upper end abuts against the driving body 17. The lifting guide rod 8 is fixed to the lifting sleeve 4 through an upper connecting seat 32 and a lower connecting seat 33, the upper swing arm 10 and the lower swing arm 9 are located between the upper connecting seat 32 and the lower connecting seat 33, and the guide seat 6 is located below the lower connecting seat 33; a lifting rotating sleeve 34 is arranged between the upper swing arm 10 and the lifting sleeve 4, the upper swing arm 10 is fixed on the lifting rotating sleeve 34, and an annular clearance gap 35 is left between the lower swing arm 9 and the lifting sleeve 4, and the lower end of the lifting rotating sleeve 34 is arranged in the annular clearance gap 35.

[0051] Specifically, both ends of the lifting drive shaft 29 are detachably connected to the output end of the linear drive 28 and the top of the drive body 17 respectively, which is equivalent to extending the output shaft of the linear drive 28. The first auxiliary lifting spring 30 provides an upward elastic thrust to the drive body 17, reducing the load of the linear drive 28 and the driving force cost. The guide rod shaft hole 16 of the lifting guide rod 8 axially penetrates, and its lower end opening is closed by the first plug 31, preventing sundries from entering and facilitating the disassembly, installation and maintenance of the first auxiliary lifting spring 30. The first plug 31 and the lower end opening of the guide rod shaft hole 16 are detachably fixed by threads. The lifting guide rod 8 is fixed to the lifting sleeve 4 through two connecting seats, with a stable structure. The lifting and rotating sleeve 34 is sleeved on the lifting sleeve 4 in a manner that can lift and rotate. The socket end of the upper swing arm 10 is sleeved on the lifting and rotating sleeve 34. A radially penetrating screw hole is provided on this socket end, and the set screw engages with this screw hole, with its inner end abutting against the outer wall of the lifting and rotating sleeve 34 to form a detachable fixed connection. The annular让位间隙35 is used for radially让位 to the lifting of the lifting and rotating sleeve 34, and the spacing of this间隙 is adapted to the thickness of the lifting and rotating sleeve 34.

[0052] In this embodiment, as Figure 7 shown, the lower connecting seat 33 is a double-hole clamp, which is similar to an 8 shape and includes two C-shaped parts. The two C-shaped parts are arranged oppositely and their ends are connected by an extension section. The lifting sleeve 4 and the lifting guide rod 8 are respectively inserted into the C-shaped parts. There is a tightening gap between the two extension sections. The bolt passes through the two extension sections to tighten this gap. At this time, the C-shaped parts are tightened to achieve a tight fit and fixation with the lifting sleeve or the lifting guide rod. The socket end of the lower swing arm 9 is sleeved on the lifting sleeve 4 and is detachably fixed to one C-shaped part of the double-hole clamp by a bolt.

[0053] In this embodiment, the upper connecting seat 32 is similar to the lower connecting seat 33 in principle, but is in the shape of a Chinese character 'Ri' and also includes two C-shaped parts. The drive seat 53 is fixed to the top surface of one of the C-shaped parts by a bolt. The lower end of this C-shaped part is provided with an annular docking groove whose inner diameter is adapted to the outer diameter of the lifting sleeve 4. The top of the lifting sleeve 4 is inserted into this annular docking groove. The cylinder body of the linear drive 28 is fixed to the top of the other C-shaped part. The upper end of the lifting guide rod 8 is inserted into this C-shaped part. The two C-shaped parts are also connected by an extension section and are tightened and closed by a bolt, so that the two C-shaped parts respectively clamp the lifting sleeve 4 and the lifting guide rod 8 to achieve fixation.

[0054] As Figure 6 It should be noted that there is an unclear "环形让位间隙35" in the original text. I translated it as "环形让位间隙35" according to the original text. You may need to check and clarify this term for a more accurate translation.As shown, the guide seat 6 is sleeved and fixed on the column 2 through an annular mounting portion 36. A D-shaped guide ring 37 is also provided on the guide seat 6. The guide ring 37 includes an arc portion 38 and a strip portion 39 that is detachably arranged horizontally at the opening of the arc portion 38. The guide hole 7 is formed between the strip portion 39 and the arc portion 38. A third rolling body 40 is rotatably connected to the inner side of the strip portion 39 and the inner side wall of the arc portion 38. The third rolling body 40 is rollingly connected to the lifting guide rod 8 and can rotate with the lifting and lowering of the lifting guide rod 8.

[0055] Specifically, the mounting portion 36 is sleeved on the column 2 and fixed on its flange portion. The guide ring 37 is D-shaped, and its vertical section (i.e., the strip portion 39) and the arc-shaped portion 38 are detachably fixed by bolts, which is convenient for the disassembly and assembly of the lifting guide rod 8. The axial direction of the third rolling body 40 is perpendicular to the axial direction of the lifting guide rod 8, and its circumferential surface rolls on the lifting guide rod 8, ensuring the stable positioning of the lifting guide rod 8 in the guide hole 7, and also reducing the resistance of the lifting guide rod 8 to the lifting action relative to the column 2.

[0056] like Figure 1 , 3 As shown, the column rotation drive mechanism 3 includes a first rotation driver 41 arranged on the base 1, the column 2 is rotatably connected to the column mounting hole 42 of the base 1, and a worm gear 43 is provided at the lower end, and the output end of the first rotation driver 41 is connected to the worm gear 43 through a worm 44; the upper and lower ends of the column mounting hole 42 are rotatably connected to the column 2 through an upper rolling bearing 45 and a lower rolling bearing 46 respectively.

[0057] Specifically, the first rotary driver 41 is arranged on the base 1 through the motor seat, and the worm 44 thereon is penetrated into the base 1 and intersects with the column mounting hole 42. The lower part of the column 2 is rotatably connected to the base 1. A worm wheel 43 is also arranged at the lower end of the column 2. The worm wheel 43 is meshed with the worm 44. The first rotary driver 41 drives the worm 44 to rotate, thereby driving the circumferential rotation of the column 2. The lower part of the column 2 is vertically rotatably connected in the column mounting hole 42 through the upper rolling bearing 45 and the lower rolling bearing 46.

[0058] like Figure 3As shown, the threaded screw lifting mechanism 5 includes a nut 50 arranged on the top of the column 2, a screw 51 is threaded in the nut 50, the upper end of the screw 51 is connected to the second rotation driver 52, the second rotation driver 52 is connected to the lifting sleeve 4 through the driver seat 53, and a rolling bearing 54 is provided between the bare rod section of the screw 51 and the driver seat 53 or the lifting sleeve 4; an axially extending center hole 55 is opened on the column 2, the nut 50 is detachably fixed to the upper end of the center hole 55, the lower end of the screw 51 extends into the center hole 55, and a second auxiliary lifting spring 56 is provided between the bottom of the center hole 55 and the screw 51, the upper end of the second auxiliary lifting spring 56 is connected to the bottom of the screw 51 through a plane bearing 57, and the lower end abuts against a second plug 58 at the lower end of the center hole 55.

[0059] Specifically, the center hole 55 axially passes through the column 2, the nut 50 is fixed to the upper end of the center hole 55, the screw 51 is meshed with the screw on the lifting sleeve 4, and the second rotary driver 52 drives the lifting sleeve 4 to move up and down relative to the column 2 by driving the screw 51 to rotate. The second auxiliary lifting spring 56 exerts an upward elastic thrust on the lifting sleeve 4 to balance part of the gravity of the lifting sleeve 4 and its upper components, reducing the driving force cost, and the lower end of the center hole 55 is closed by the second plug 58 to prevent debris from entering, and also facilitate the disassembly and maintenance of the second auxiliary lifting spring 56. The second plug 58 is detachably fixed in the lower end opening of the center hole 55 through threads.

[0060] like Figure 1 , 5 As shown, the clutch assembly 11 includes an anti-rotation column 59 and an anti-rotation hole 60 which are respectively arranged on the upper swing arm 10 and the lower swing arm 9 and extend axially. The anti-rotation column 59 can be inserted into the anti-rotation hole 60 when the upper swing arm 10 and the lower swing arm 9 are at the same rotation angle and extend vertically close to each other.

[0061] Specifically, the anti-rotation column 59 and the anti-rotation hole 60 are at the same distance from the axis of the column 2. When the upper swing arm 10 and the lower swing arm 9 rotate to the same angle, the upper swing arm 10 and the lower swing arm 9 are exactly located on the same vertical line. As the upper swing arm 10 and the lower swing arm 9 approach vertically, the anti-rotation column 59 is inserted into the anti-rotation hole 60 and rotates to limit the position. The outer diameter of the anti-rotation column 59 is adapted to the inner diameter of the anti-rotation hole 60.

[0062] In this embodiment, a sensor frame 61 is provided on the guide seat 6. A height sensor assembly 63 located on the side of the lifting guide rod 8 is detachably provided in a vertical strip hole 62 of the sensor frame 61. The height sensor assembly 63 includes a first sensor 64 located above the guide seat 6 and a second sensor 65 located below the guide seat 6. The first sensor 64 is located on the side of the lifting path of the lower connecting seat 33, and the second sensor 65 is located on the side of the lifting path of the bottom end of the lifting guide rod 8. A swing angle sensor assembly 66 located below the guide seat 6 is provided on the base 1. The swing angle sensor assembly 66 includes two third sensors 67 distributed circumferentially. The third sensor 67 is detachably fixed to the side of the base 1 through a connecting piece 68. The guide seat 6 rotates between the third sensors 67.

[0063] Specifically, the sensor frame 61 is fixed to the side of the guide seat 6 by bolts, and the first sensor 64 thereon is arranged horizontally, and the lifting height is determined by detecting whether the lower connecting seat 33 passes through. The second sensor 65 is also arranged horizontally, and the lifting height is determined by detecting whether the bottom end of the lifting guide rod 8 passes through the side, and it also serves as a warning of the maximum lifting height of the lifting guide rod 8 to prevent the lifting guide rod 8 from slipping out of the guide hole 7. The swing angle sensor assembly 66 is used to detect the rotation angle of the column 2, which is specifically realized by two vertically arranged third sensors 67. The third sensor 67 is located below the guide seat 6 and faces the guide seat 6. The guide seat 6 rotates between the third sensors 67 with the column 2. The third sensor 67 detects whether the side of the guide ring 37 of the guide seat 6 passes through to realize the corresponding swing angle position judgment. The third sensor 67 is arranged on the connecting piece 68, and the connecting piece 68 is fixed to the top surface of the base by bolts. At the same time, the inner side of the connecting piece covers the outer ring of the upper rolling bearing 45, and the upper rolling bearing 45 is limited in the column mounting hole 42. The first sensor 64 , the second sensor 65 and the third sensor 67 are laser sensors.

[0064] Specific working principle: when the upper swing arm 10 and the lower swing arm 9 need to rise as a whole, the second rotary driver 52 is activated, the screw 51 rotates, and the lifting sleeve 4 is driven to lift the upper swing arm 10 and the lower swing arm 9; when they need to fall as a whole, the second rotary driver 52 is reversed. When the upper swing arm 10 needs to rotate away from the lower swing arm 9, the output shaft of the linear driver 28 is retracted, the driving body 17 rises, the first rolling body 23 pushes the upper swing arm 10 upward, the anti-rotation column 59 leaves the anti-rotation hole 60, and the return spring 26 pulls the upper swing arm 10 to rotate until the side is against the abutment point on the sock machine; when the angle is required to be consistent, the second rotary driver 52 is activated, the column 2 rotates with the lifting sleeve 4, and the lower swing arm 9 rotates to the bottom of the upper swing arm 10 that is restricted from continuing to rotate, and then the linear driver 28 is reversed, and the upper swing arm 10 is lowered until the anti-rotation column 59 extends and inserts into the anti-rotation hole 60.

[0065] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A swing arm transfer module, comprising a base (1) and a column (2), a column rotation drive mechanism (3) being provided between the base (1) and the column (2), a lifting sleeve (4) being provided on the column (2), a threaded screw lifting mechanism (5) being provided between the lifting sleeve (4) and the column (2), characterized in that: A guide seat (6) located on one side is fixed on the column (2), and a lifting guide rod (8) parallel to the column (2) is inserted into the guide hole (7) of the guide seat (6). The lifting guide rod (8) is fixedly connected to the lifting sleeve (4), and a lower swing arm (9) and an upper swing arm (10) are sleeved on the lifting sleeve (4). The lower swing arm (9) is fixedly connected to the lifting sleeve (4), and the upper swing arm (10) is movably connected to the lifting sleeve (4). A clutch assembly (11) is provided between the upper swing arm (10) and the lower swing arm (9), and an upper swing arm lifting mechanism (12) is provided between the upper swing arm (10) and the lifting guide rod (8). An upper swing arm linkage rotation reset mechanism (13) capable of driving the upper swing arm (10) to move axially and to rotate and reset the upper swing arm (10) is provided between the upper swing arm lifting mechanism (12) and the upper swing arm (10).

2. The swing arm transfer module according to claim 1, characterized in that: The upper swing arm lifting mechanism (12) comprises an upper swing arm driving connection member (14) sleeved on the lifting guide rod (8), a lifting driving assembly (15) is provided between the upper swing arm driving connection member (14) and the lifting guide rod (8), the upper swing arm driving connection member (14) is connected to the upper swing arm (10), and an upper swing arm linkage rotation reset mechanism (13) is provided between the upper swing arm driving connection member (14) and the upper swing arm linkage rotation reset mechanism (13), which can drive the upper swing arm (10) to move axially and to enable it to rotate and reset.

3. The swing arm transfer module according to claim 2, characterized in that: The lifting drive assembly (15) comprises a driving body (17) which is arranged in a guide rod shaft hole (16) of the lifting guide rod (8) and is capable of axial movement. A linear driving unit (18) is arranged between the driving body (17) and the lifting guide rod (8). The driving body (17) is provided with N radial shafts (19) distributed along the circumferential direction, where N ≥ 1. The lifting guide rod (8) is provided with axial strip holes (20) which are equal in number to the radial shafts (19) and enable the guide rod shaft hole (16) to be radially connected to the outside. The radial shafts (19) are penetrated by the axial strip holes (20) and correspond one to one. The outer ends of the radial shafts (19) are connected to the upper swing arm driving connector (14).

4. The swing arm transfer module according to claim 2, characterized in that: The upper swing arm linkage rotation reset mechanism (13) comprises an annular groove (22) arranged on the upper swing arm (10), the annular groove (22) being coaxially arranged with the column (2), at least two first rolling bodies (23) being evenly distributed along the circumferential direction and capable of sliding in the annular groove (22) being arranged in the annular groove (22), the first rolling bodies (23) being connected to the upper swing arm drive connector (14) via a rolling body seat (24), and an upper swing arm rotation reset assembly (69) being further arranged between the lifting guide rod (8) and the lifting sleeve (4).

5. The swing arm transfer module according to claim 4, characterized in that: The rotary reset assembly (69) comprises a spring bracket (25) arranged on the upper swing arm drive connector (14) and located between the lifting guide rod (8) and the lifting sleeve (4), and a rotary reset spring (26) is provided between the spring bracket (25) and the annular groove (22).

6. The swing arm transfer module according to claim 4, characterized in that: The rolling body seat (24) is arc-shaped and partially surrounds the annular groove (22); the first rolling body (23) is slidably connected to the side walls of the annular groove (22); the diameter of the first rolling body (23) is adapted to the width of the annular groove (22); and at least one second rolling body (27) is provided between the rolling body seat (24) and the annular groove (22) and is in slidable contact with the bottom of the annular groove (22).

7. The swing arm transfer module according to claim 3, characterized in that: The linear drive unit (18) comprises a linear drive (28) fixed to the top of the lifting guide rod (8), and the linear drive (28) is connected to the drive body (17) via a lifting drive shaft (29); A first auxiliary lifting spring (30) is provided between the driving body (17) and the bottom of the lifting guide rod (8); the lower end of the first auxiliary lifting spring (30) abuts against a first plug (31) at the lower end of the guide rod shaft hole (16), and the upper end abuts against the driving body (17).

8. The swing arm transfer module according to any one of claims 1 to 7, characterized in that: The lifting guide rod (8) is fixed to the lifting sleeve (4) via an upper connecting seat (32) and a lower connecting seat (33); the upper swing arm (10) and the lower swing arm (9) are located between the upper connecting seat (32) and the lower connecting seat (33); and the guide seat (6) is located below the lower connecting seat (33); A lifting and rotating sleeve (34) is provided between the upper swing arm (10) and the lifting sleeve (4); the upper swing arm (10) is fixed on the lifting and rotating sleeve (34); an annular clearance gap (35) is left between the lower swing arm (9) and the lifting sleeve (4); and the lower end of the lifting and rotating sleeve (34) is arranged in the annular clearance gap (35).

9. The swing arm transfer module according to any one of claims 1 to 7, characterized in that: The column rotation drive mechanism (3) comprises a first rotation drive (41) arranged on the base (1); the column (2) is rotationally connected to the column mounting hole (42) of the base (1), and a worm gear (43) is provided at the lower end; the output end of the first rotation drive (41) is transmission-connected to the worm gear (43) via a worm (44); and the upper and lower ends of the column mounting hole (42) are rotationally connected to the column (2) via an upper rolling bearing (45) and a lower rolling bearing (46), respectively.

10. The swing arm transfer module according to any one of claims 1 to 7, characterized in that: The threaded screw lifting mechanism (5) comprises a nut (50) arranged at the top of the column (2), a screw (51) being threadedly connected inside the nut (50), the upper end of the screw (51) being connected to a second rotary driver (52), the second rotary driver (52) being connected to the lifting sleeve (4) via a driver seat (53), and a rolling bearing (54) being provided between the bare rod section of the screw (51) and the driver seat (53) or the lifting sleeve (4); The column (2) is provided with an axially extending center hole (55), the nut (50) is detachably fixed to the upper end of the center hole (55), the lower end of the screw rod (51) extends into the center hole (55), a second auxiliary lifting spring (56) is provided between the bottom of the center hole (55) and the screw rod (51), the upper end of the second auxiliary lifting spring (56) is connected to the bottom of the screw rod (51) via a plane bearing (57), and the lower end abuts against a second plug (58) at the lower end of the center hole (55); The clutch assembly (11) comprises an anti-rotation column (59) and an anti-rotation hole (60) which are respectively arranged on the upper swing arm (10) and the lower swing arm (9) and extend axially. The anti-rotation column (59) can be inserted into the anti-rotation hole (60) when the upper swing arm (10) and the lower swing arm (9) are at the same rotation angle and extend vertically close to each other.

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