Head lifting structure of hosiery machine

Abstract

The utility model belongs to the technical field of hosiery machines, particularly relates to a machine head lifting structure of a hosiery machine, and solves the problem that a guide pipe is deflected due to unstable installation of a machine head. The machine head lifting structure of the hosiery machine comprises a machine frame, a guide pipe is vertically fixed to the machine frame through a base, a machine head assembly is arranged on the guide pipe in an axial lifting mode, an installation positioning hole is formed in the top face of the machine frame, a positioning part extending in the axial direction is arranged at the bottom of the base, and the machine head assembly is arranged on the machine frame. The positioning part is matched with the installation positioning hole and inserted into the installation positioning hole in an extending mode, and the top face of the base is fixedly connected with a rack through a detachable fixing structure. The effects that the machine head is stably installed, and the guide pipe can be stably kept in a vertical state are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of sock machine technology, and specifically relates to a head lifting structure for a sock machine. Background Technology

[0002] A sock knitting machine is a complex mechanical device used for knitting socks. Its head is equipped with the relevant structures for specific knitting operations. The head is generally fixed to the frame via a base and a shaft on the base, and can move up and down.

[0003] However, in most existing technologies, the base is fixed to the top surface of the frame by only a few bolts arranged circumferentially. Such a fixing method cannot guarantee the stability of the base installation, that is, it cannot guarantee that the shaft on it will always remain vertical. Different tightness of each bolt and some bolts loosening due to vibration during the operation of the sock machine may cause the shaft to shift, which in turn leads to a decrease in knitting accuracy. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a head lifting structure for a sock knitting machine.

[0005] To achieve the innovative objectives of this utility model, the following technical solutions can be used:

[0006] A head lifting structure for a sock machine includes a frame, a guide tube vertically fixed on the frame via a base, a head assembly axially and vertically mounted on the guide tube, a mounting and positioning hole on the top surface of the frame, and an axially extending positioning part at the bottom of the base, the positioning part matching the mounting and positioning hole and extending into the mounting and positioning hole, the top surface of the base being connected to the frame via a detachable fixing structure.

[0007] In the head lifting structure of this utility model, the head assembly is set on the frame via a guide tube. The lower end of the guide tube is installed on the frame via a base. The base is vertically set in the mounting positioning hole via a positioning part. The outer diameter of the positioning part matches the inner diameter of the mounting positioning hole. The positioning part has a certain axial length and extends into the mounting positioning hole to achieve radial positioning. At the same time, the top surface of the base is detachably fixed to the top surface of the frame to achieve end face fixation. Under the dual action of radial positioning and end face fixation, the vertical stability of the base and the guide tube on it is ensured, so that the concentricity of the center hole on the head assembly and the frame is guaranteed. In addition, during installation, the positioning part of the base can be aligned with the mounting positioning hole and inserted to achieve vertical pre-installation. Then, it can be locked by the detachable fixing structure, which improves the convenience of installation.

[0008] In the above-mentioned head lifting structure of the sock machine, the positioning part includes a cylindrical outer wall, and a plurality of axially extending inner positioning protrusions are arranged circumferentially inside the mounting positioning hole. The protruding end of the inner positioning protrusion is slidably connected to the cylindrical outer wall.

[0009] Alternatively, the positioning part may have a plurality of axially extending external positioning protrusions arranged circumferentially on its outer side, and the mounting positioning hole may include a cylindrical inner wall, with the protruding end of the external positioning protrusion slidably connected to the cylindrical inner wall.

[0010] Alternatively, the positioning part includes a cylindrical outer sidewall, the mounting positioning hole includes a cylindrical inner sidewall, and the cylindrical outer sidewall and the cylindrical inner sidewall are slidably connected.

[0011] The positioning part and the mounting positioning hole can be fitted together through two circumferentially continuous contact surfaces, or they can be fitted together between two contact surfaces that are circumferentially discontinuous and circumferentially continuous. That is, the contact surfaces of the protruding ends of each positioning protrusion are circumferentially distributed. By using positioning protrusions, material costs can be reduced and lightweighting can be improved while ensuring installation stability.

[0012] In the aforementioned head lifting structure of the sock machine, the detachable fixing structure includes a flange portion disposed on the base and a threaded hole disposed on the frame. A connecting hole is provided through the flange portion, and a fixing bolt passes through the connecting hole and engages with the threaded hole.

[0013] The vertical cross-section of the base is similar to a cross shape. Above the positioning part, there is a radially protruding flange with a connecting hole. The frame has a corresponding threaded hole. The threaded hole is circumferentially distributed on the outside of the mounting positioning hole. The connecting hole and the threaded hole are detachably fixed by fixing bolts, which is convenient for disassembly and assembly. The bottom surface of the flange is in close contact with the top surface of the frame to ensure stable installation.

[0014] In the aforementioned head lifting structure of the sock machine, the threaded hole is located on the upper end face of the inner positioning protrusion.

[0015] A radially protruding inner positioning protrusion is provided on the inner wall of the mounting positioning hole. The cross-section of the inner positioning protrusion can be in a triangular shape, which also provides a platform for setting the threaded hole.

[0016] In the aforementioned head lifting structure of the sock machine, the guide tube is fitted with a lifting cylinder, the guide tube has an inner hole extending axially from top to bottom, the inner hole is fitted with a lifting shaft, and the head assembly includes an upper head disposed on the upper end of the lifting shaft and a lower head disposed on the lifting cylinder.

[0017] The machine head assembly consists of an upper machine head located at the top and a lower machine head located at the bottom, which is the prior art. The lower machine head is set on the guide tube through a lifting cylinder, and the upper machine head is set on the guide tube through a lifting shaft. The lifting shaft can slide axially through the inner hole of the guide tube, ensuring the lifting of the upper machine head.

[0018] In the aforementioned head lifting structure of the sock machine, the lifting cylinder has bushing mounting ports at its upper and lower ends. The inner diameter of the bushing mounting ports is larger than the inner diameter of the lifting cylinder, and an annular step with a stepped surface facing outward is formed between them. A first positioning bushing is tightly fitted inside the bushing mounting port, and the inner end face of the first positioning bushing abuts against the annular step. The guide tube is fitted with the first positioning bushing with a clearance fit.

[0019] The upper and lower openings of the lifting cylinder are provided with bushing mounting ports with larger inner diameters. These bushing mounting ports are used to install the first positioning bushing in a tight fit. The first positioning bushing is designed with a thickened inner diameter that matches the outer diameter of the guide tube. The guide tube fits perfectly into the first positioning bushing, effectively reducing radial offset and ensuring the vertical stability of the guide tube. The annular step is formed by the difference in inner diameter and is used to limit the installation depth of the first positioning bushing for easy installation.

[0020] In the above-mentioned head lifting structure of the sock machine, the upper end of the lifting cylinder is higher than the upper end of the guide tube, and a bushing installation gap is formed between the upper end of the lifting cylinder and the lifting shaft located above the guide tube. A second positioning bushing is provided in the bushing installation gap, and the second positioning bushing is tightly connected to the bushing installation opening. The lifting shaft is fitted with the second positioning bushing with a clearance fit.

[0021] The upper end face of the guide tube is located inside the bushing mounting port at the upper end of the lifting cylinder. A second positioning bushing is installed between the upper end face and the upper end face of the lifting cylinder. The outer diameter of the second positioning bushing is adapted to the inner diameter of the first positioning bushing and the bushing mounting port, but the inner diameter is smaller than that of the first positioning bushing. This inner diameter is adapted to the outer diameter of the lifting shaft inside the guide tube, which improves the positioning effect of the lifting shaft.

[0022] In the aforementioned head lifting structure of the sock machine, the upper head side is provided with a lifting drive seat, and the bottom surface of the lifting drive seat is provided with a vertical screw sleeve. The lower head side is provided with a U-shaped connecting seat located below the lifting drive seat. The screw sleeve is located inside the U-shaped connecting seat and is detachably fixed by screws. A drive screw is rotatably connected inside the screw sleeve. The upper end of the drive screw is connected to a circumferential driver on the lifting drive seat. The base is provided with a lifting drive screw hole, and the lower section of the drive screw is engaged with the lifting drive screw hole.

[0023] The lead screw sleeve, upper head, and lower head are connected as a single unit. The drive lead screw engages with the lifting drive screw hole on the base. The forward and reverse rotation of the drive lead screw, controlled by a circumferential actuator, drives the lifting of the head assembly relative to the base. The U-shaped connecting seat on the lower head is fixed to the lead screw sleeve with fastening screws; this connection is flexible and easily detachable. The details of the transmission connection between the circumferential actuator and the drive lead screw are common knowledge and will not be elaborated upon.

[0024] In the aforementioned head lifting structure of the sock machine, an anti-rotation positioning platform is provided on the base, and an anti-rotation hole is provided on the anti-rotation positioning platform. An anti-rotation positioning rod parallel to the guide tube passes through the anti-rotation hole, and the anti-rotation positioning rod is fixedly connected to the lifting cylinder through a transverse connecting rod.

[0025] A horizontal connecting rod is detachably fixed to the lifting cylinder by bolts. An anti-rotation positioning rod is inserted through and fixed to the horizontal connecting rod. The lower end of the anti-rotation positioning rod passes through the anti-rotation hole on the base, which ensures that the lifting cylinder can rise and fall vertically while restricting circumferential rotation.

[0026] In the aforementioned head lifting structure of the sock machine, the base is provided with an axially extending mounting hole, the lower end of the guide tube is inserted into the mounting hole and fixed, and a lightweight structure is provided between the mounting hole and the outer side wall of the positioning part. The lightweight structure includes several slots extending axially upward from the bottom surface of the positioning part.

[0027] The lower end of the guide tube is fixed in the mounting hole of the base. The lightweight structure can be in the form of a slot at the bottom of the positioning part. The slot is located between the cylindrical outer wall of the positioning part and the inner wall of the mounting hole. Adjacent slots are separated by radially extending connecting ribs, which reduces the cost of processing materials and also reduces the weight of the base.

[0028] Compared with the prior art, the present invention has the following main advantages:

[0029] 1. The outer diameter of the positioning part is adapted to the inner diameter of the mounting positioning hole. The positioning part with a certain axial length is inserted into the mounting positioning hole to achieve radial positioning. At the same time, the top surface of the base is detachably fixed to the top surface of the frame to achieve end face fixation. Under the dual action of radial positioning and end face fixation, the vertical stability of the base and its guide tube is ensured, so that the concentricity of the center hole on the head assembly and the frame is guaranteed. In addition, during installation, the positioning part can be pre-installed vertically by aligning it with the mounting positioning hole, and then locked by the detachable fixing structure, which improves the convenience of installation.

[0030] 2. The upper and lower openings of the lifting cylinder are provided with bushing mounting ports with larger inner diameters. These bushing mounting ports are used to install the first positioning bushing in a tight fit. The first positioning bushing adopts a thickened design, and its inner diameter is adapted to the outer diameter of the guide tube. The guide tube passes through the first positioning bushing precisely, effectively reducing radial offset and ensuring the vertical stability of the guide tube. The annular step is formed by the difference in inner diameter and is used to limit the installation depth of the first positioning bushing for easy installation.

[0031] 3. The second positioning bushing is set between the lifting sleeve and the lifting shaft, and the first positioning bushing is set between the guide tube and the lifting sleeve. At least three bushings ensure the vertical stability of the lifting shaft.

[0032] 4. The lead screw sleeve, upper head, and lower head are connected as a single unit. The drive lead screw engages with the lifting drive screw hole on the base. The lifting and lowering of the head assembly relative to the base is achieved by controlling the forward and reverse rotation of the drive lead screw through a circumferential actuator. The U-shaped connecting seat on the lower head is fixedly connected to the lead screw sleeve with fastening screws. This connection is flexible and detachable, making assembly and disassembly convenient.

[0033] 5. A horizontal connecting rod is detachably fixed to the lifting cylinder by bolts. An anti-rotation positioning rod is inserted through and fixed to the horizontal connecting rod. The lower end of the anti-rotation positioning rod passes through the anti-rotation hole on the base, which restricts circumferential rotation while ensuring the vertical lifting of the lifting cylinder. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure provided by this utility model;

[0035] Figure 2 This is a cross-sectional schematic diagram provided by this utility model (the cross-section passes through the axis of the guide tube and the drive screw).

[0036] Figure 3 This is a schematic diagram of the structure of the frame plate provided by this utility model;

[0037] Figure 4 This is a schematic diagram of the structure of the base provided by this utility model;

[0038] Figure 5 This is a bottom view of the base provided by this utility model;

[0039] Figure 6 This is a structural schematic diagram of the lifting cylinder provided by this utility model.

[0040] In the figure, 1 is the frame, 2 is the base, 3 is the guide tube, 4 is the head assembly, 5 is the mounting and positioning hole, 6 is the positioning part, 7 is the detachable fixing structure, 8 is the cylindrical outer wall, 9 is the inner positioning protrusion, 10 is the flange, 11 is the threaded hole, 12 is the connecting hole, 13 is the fixing bolt, 14 is the lifting cylinder, 15 is the inner hole, 16 is the lifting shaft, 17 is the upper head, 18 is the lower head, 19 is the bushing mounting port, 20 is the annular step, 21 is the first positioning bushing, 22 is the bushing mounting gap, 23 is the second positioning bushing, 24 is the lifting drive seat, 25 is the lead screw sleeve, 26 is the U-shaped connecting seat, 27 is the drive lead screw, 28 is the lifting drive screw hole, 29 is the anti-rotation positioning platform, 30 is the anti-rotation hole, 31 is the anti-rotation positioning rod, 32 is the transverse connecting rod, 33 is the mounting hole, and 34 is the slot. Detailed Implementation

[0041] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0042] Specific implementation examples Figure 1-6 As shown, the head lifting structure of this sock machine includes a frame 1. A guide tube 3 is vertically fixed on the frame 1 via a base 2. A head assembly 4 is axially lifted and lowered on the guide tube 3. A mounting positioning hole 5 is provided on the top surface of the frame 1. An axially extending positioning part 6 is provided at the bottom of the base 2. The positioning part 6 matches the mounting positioning hole 5 and is inserted into the mounting positioning hole 5. The top surface of the base 2 is connected to the frame 1 via a detachable fixing structure 7.

[0043] Specifically, the head assembly 4 is mounted on the frame 1 via the guide tube 3. The lower end of the guide tube 3 is mounted on the frame 1 via the base 2. The base 2 is vertically positioned in the mounting positioning hole 5 via the positioning part 6. The inner and outer diameters of the positioning part 6 and the mounting positioning hole 5 are adapted to each other. The positioning part 6 has a certain axial length and extends into the mounting positioning hole 5 to achieve radial positioning. At the same time, the top surface of the base 2 is detachably fixed to the top surface of the frame 1 to achieve end face fixation. Under the dual action of radial positioning and end face fixation, the vertical stability of the base 2 and the guide tube 3 on it is ensured, so that the concentricity of the center hole on the head assembly 4 and the frame 1 is guaranteed. In addition, during installation, the positioning part 6 of the base 2 can be aligned with the mounting positioning hole 5 and inserted to achieve vertical pre-installation. Then, it can be locked by the detachable fixing structure 7, which improves the convenience of installation.

[0044] As an explanation, Figure 1-6 Only components directly related to this application are shown for illustrative purposes; structural details of the upper head 17, lower head 18, and frame 1 are not shown in detail.

[0045] like Figure 2 , 3As shown, the positioning part 6 includes a cylindrical outer wall 8, and a plurality of axially extending inner positioning protrusions 9 are arranged circumferentially inside the mounting positioning hole 5. The protruding ends of the inner positioning protrusions 9 are slidably connected to the cylindrical outer wall 8. The detachable fixing structure 7 includes a flange part 10 provided on the base 2, and a threaded hole 11 provided on the top surface of the inner positioning protrusions 9. A connecting hole 12 is provided through the flange part 10, and the fixing bolt 13 passes through the connecting hole 12 and engages with the threaded hole 11.

[0046] Specifically, the vertical cross-section of the base 2 is similar to a cross shape. Above the positioning part 6, there is a radially protruding flange part 10. The flange part 10 is provided with a connecting hole 12, and a corresponding threaded hole 11 is provided on the frame 1. The connecting hole 12 and the threaded hole 11 are detachably fixed by fixing bolts 13, which makes disassembly and assembly convenient. The bottom surface of the flange part 10 is in close contact with the top surface of the frame 1 to ensure stable installation.

[0047] like Figure 1 , 2 As shown in Figure 6, a lifting cylinder 14 is fitted over the guide tube 3. An inner hole 15 extends axially from top to bottom within the guide tube 3, through which a lifting shaft 16 passes. The machine head assembly 4 includes an upper machine head 17 located at the upper end of the lifting shaft 16 and a lower machine head 18 located on the lifting cylinder 14. The lifting cylinder 14 has bushing mounting ports 19 at its upper and lower ends. The inner diameter of the bushing mounting ports 19 is larger than the inner diameter of the lifting cylinder 14, and an annular step 20 with a stepped surface facing outwards is formed between them. A first positioning bushing 21 is tightly fitted inside the bushing mounting port 19, with its inner end face abutting against the annular step 20. The first positioning bushing 21 passes through the guide tube 3 with a clearance fit. The upper end of the lifting cylinder 14 is higher than the upper end of the guide tube 3. A bushing installation gap 22 is formed between the upper end of the lifting cylinder 14 and the lifting shaft 16 above the guide tube 3. A second positioning bushing 23 is provided in the bushing installation gap 22. The second positioning bushing 23 is tightly connected to the bushing installation port 19. The lifting shaft 16 passes through the second positioning bushing 23 with clearance.

[0048] Specifically, the lower head 18 is mounted on the guide tube 3 via a lifting cylinder 14, and the upper head 17 is mounted on the guide tube 3 via a lifting shaft 16. The lifting shaft 16 is axially and slidably inserted into the inner hole 15 of the guide tube 3, ensuring the lifting and lowering of the upper head 17. The upper and lower openings of the lifting cylinder 14 are provided with bushing mounting ports 19 with larger inner diameters. These bushing mounting ports 19 are used to tightly fit the first positioning bushing 21. The first positioning bushing 21 is thickened, and its inner diameter is adapted to the outer diameter of the guide tube 3. The guide tube 3 fits perfectly into the first positioning bushing 21, effectively reducing radial offset and ensuring the vertical stability of the guide tube 3. The annular step 20 is formed by the difference in inner diameter, which can limit the installation depth of the first positioning bushing 21 and facilitate installation. The upper end face of the guide tube 3 is located inside the bushing mounting port 19 at the upper end of the lifting cylinder 14. A second positioning bushing 23 is installed between the upper end face and the upper end face of the lifting cylinder 14. The outer diameter of the second positioning bushing 23 is adapted to the inner diameter of the first positioning bushing 21 and the bushing mounting port 19, but the inner diameter is smaller than that of the first positioning bushing 21. The inner diameter is adapted to the outer diameter of the lifting shaft 16 inside the guide tube 3, thereby improving the positioning effect of the lifting shaft 16.

[0049] like Figure 1 , 2 As shown in Figure 6, the upper head 17 is provided with a lifting drive seat 24 on its side, and a vertical lead screw sleeve 25 is provided on the bottom surface of the lifting drive seat 24. The lower head 18 is provided with a U-shaped connecting seat 26 located below the lifting drive seat 24 on its side. The lead screw sleeve 25 is located in the U-shaped connecting seat 26 and is detachably fixed by fastening screws. A drive lead screw 27 is rotatably connected inside the lead screw sleeve 25. The upper end of the drive lead screw 27 is connected to the circumferential drive on the lifting drive seat 24. The base 2 is provided with a lifting drive screw hole 28, and the lower section of the drive lead screw 27 is engaged with the lifting drive screw hole 28.

[0050] Specifically, the lead screw sleeve 25, the upper machine head 17, and the lower machine head 18 are connected as a single unit. The drive lead screw 27 engages with the lifting drive screw hole 28 on the base 2. The lifting and lowering of the machine head assembly 4 relative to the base 2 can be achieved by controlling the forward and reverse rotation of the drive lead screw 27 through a circumferential driver. The U-shaped connecting seat 26 on the lower machine head 18 is fixedly connected to the lead screw sleeve 25 by fastening screws. This connection is flexible and detachable, making assembly and disassembly convenient.

[0051] like Figure 1 , 4As shown in Figure 5, an anti-rotation positioning platform 29 is provided on the base 2. The anti-rotation positioning platform 29 has an anti-rotation hole 30. An anti-rotation positioning rod 31 parallel to the guide tube 3 passes through the anti-rotation hole 30. The anti-rotation positioning rod 31 is fixedly connected to the lifting cylinder 14 through a transverse connecting rod 32. The base 2 has an axially extending mounting hole 33. The lower end of the guide tube 3 is inserted into the mounting hole 33 and fixed. A lightweight structure is provided between the mounting hole 33 and the outer wall of the positioning part 6. The lightweight structure includes several slots 34 extending axially upward from the bottom surface of the positioning part 6.

[0052] Specifically, a horizontal connecting rod 32 is detachably fixed to the lifting cylinder 14 by bolts. An anti-rotation positioning rod 31 passes through and is fixed to the horizontal connecting rod 32. The lower end of the anti-rotation positioning rod 31 passes through the anti-rotation hole 30 on the base 2, which restricts circumferential rotation while ensuring the vertical lifting of the lifting cylinder 14. The lower end of the guide tube 3 is fixed in the mounting hole 33 of the base 2. A slot 34 is set between the cylindrical outer wall 8 of the positioning part 6 and the inner wall of the mounting hole 33. Adjacent slots 34 are separated by radially extending connecting ribs, which reduces the processing material cost and also reduces the weight of the base 2.

[0053] Specific working principle: When installing the base 2, align the positioning part 6 with the mounting positioning hole 5 on the frame 1 and insert it. Then, align the connecting hole 12 with the threaded hole 11 and tighten the fixing bolt 13 to fix it. After that, the lifting cylinder 14 and lifting shaft 16 and other components can be installed on the guide tube 3.

[0054] When the head assembly 4 needs to be raised or lowered, the circumferential drive is activated to control the rotation of the drive screw 27. The drive screw 27 moves up and down relative to the base 2. The rotational motion of the drive screw 27 is converted into axial lifting motion, and the head assembly 4 connected to the drive screw 27 moves up and down synchronously.

[0055] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A head lifting structure for a sock knitting machine, comprising a frame (1), wherein a guide tube (3) is vertically fixed on the frame (1) via a base (2), and a head assembly (4) is axially and vertically mounted on the guide tube (3), characterized in that, The top surface of the frame (1) is provided with mounting positioning holes (5), and the bottom of the base (2) is provided with an axially extending positioning part (6). The positioning part (6) matches the mounting positioning holes (5) and is inserted into the mounting positioning holes (5). The top surface of the base (2) is connected to the frame (1) through a detachable fixing structure (7).

2. The head lifting structure of the sock machine according to claim 1, characterized in that, The positioning part (6) includes a cylindrical outer wall (8), and the mounting positioning hole (5) has a plurality of axially extending inner positioning protrusions (9) arranged in the inner circumferential direction. The protruding end of the inner positioning protrusion (9) is slidably connected to the cylindrical outer wall (8). Alternatively, the positioning part (6) has a plurality of axially extending external positioning protrusions arranged circumferentially on its outer side, the mounting positioning hole includes a cylindrical inner wall, and the protruding end of the external positioning protrusion is slidably connected to the cylindrical inner wall. Alternatively, the positioning part (6) includes a cylindrical outer sidewall, the mounting positioning hole includes a cylindrical inner sidewall, and the cylindrical outer sidewall and the cylindrical inner sidewall are slidably connected.

3. The head lifting structure of the sock machine according to claim 2, characterized in that, The detachable fixing structure (7) includes a flange (10) on the base (2) and a threaded hole (11) on the frame (1). A connecting hole (12) is provided through the flange (10), and a fixing bolt (13) passes through the connecting hole (12) and engages with the threaded hole (11).

4. The head lifting structure of the sock machine according to claim 3, characterized in that, The threaded hole (11) is located on the upper end face of the inner positioning protrusion (9).

5. The head lifting structure of the sock machine according to claim 1, characterized in that, The guide tube (3) is fitted with a lifting cylinder (14), and the guide tube (3) has an inner hole (15) extending axially from top to bottom. The lifting shaft (16) passes through the inner hole (15). The machine head assembly (4) includes an upper machine head (17) located at the upper end of the lifting shaft (16) and a lower machine head (18) located on the lifting cylinder (14).

6. The head lifting structure of the sock machine according to claim 5, characterized in that, The lifting cylinder (14) has bushing mounting ports (19) at its upper and lower ends. The inner diameter of the bushing mounting port (19) is larger than the inner diameter of the lifting cylinder (14), and an annular step (20) with the stepped surface facing outward is formed between them. A first positioning bushing (21) is tightly fitted inside the bushing mounting port (19). The inner end face of the first positioning bushing (21) abuts against the annular step (20). The guide tube (3) passes through the first positioning bushing (21) with a clearance fit.

7. The head lifting structure of the sock machine according to claim 6, characterized in that, The upper end of the lifting cylinder (14) is higher than the upper end of the guide tube (3). A bushing installation gap (22) is formed between the upper end of the lifting cylinder (14) and the lifting shaft (16) above the guide tube (3). A second positioning bushing (23) is provided in the bushing installation gap (22). The second positioning bushing (23) is tightly connected to the bushing installation port (19). The lifting shaft (16) is fitted with the second positioning bushing with a clearance fit.

8. The head lifting structure of the sock machine according to claim 5, characterized in that, The upper head (17) is provided with a lifting drive seat (24) on its side. The bottom surface of the lifting drive seat (24) is provided with a vertical lead screw sleeve (25). The lower head (18) is provided with a U-shaped connecting seat (26) located below the lifting drive seat (24) on its side. The lead screw sleeve (25) is located in the U-shaped connecting seat (26) and is fixed in a detachable manner by screws. The lead screw sleeve (25) is rotatably connected to a drive screw (27). The upper end of the drive screw (27) is connected to the circumferential drive on the lifting drive seat (24). The base (2) is provided with a lifting drive screw hole (28). The lower section of the drive screw (27) is engaged with the lifting drive screw hole (28).

9. The head lifting structure of the sock machine according to claim 5, characterized in that, The base (2) is provided with an anti-rotation positioning platform (29), the anti-rotation positioning platform (29) is provided with an anti-rotation hole (30), and an anti-rotation positioning rod (31) parallel to the guide tube (3) is inserted through the anti-rotation hole (30). The anti-rotation positioning rod (31) is fixedly connected to the lifting cylinder (14) through a transverse connecting rod (32).

10. The head lifting structure of the sock machine according to any one of claims 1-9, characterized in that, The base (2) is provided with an axially extending mounting hole (33). The lower end of the guide tube (3) is inserted into the mounting hole (33) and fixed. A lightweight structure is provided between the mounting hole (33) and the outer wall of the positioning part (6). The lightweight structure includes several slots (34) extending axially upward from the bottom surface of the positioning part (6).

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