Automobile battery box nut hot pressing equipment

Abstract

The present application relates to nut hot-pressing equipment technical field, specifically to a kind of automobile battery box nut hot-pressing equipment, including base and the top frame fixed on base, further include hot-pressing mechanism, the hot-pressing mechanism includes: nut conveying pipe, it is arranged along vertical direction, bottom end is used to correspond the mounting hole on automobile battery box, top end is used to receive the nut to be hot-pressed;Radial clamping deviation correction mechanism, set up in the lower part of the nut conveying pipe circumferential side, including multiple circumferential distribution clamping deviation correction unit, each clamping deviation correction unit includes: support assembly, elastically rotatably connected to the side wall of the nut conveying pipe, with vertical piece in initial state is kept vertical;Main rod, slidingly connected to the vertical piece, its lower part is equipped with the contact piece for contacting nut from side face.This application sets up deviation amplification transmission assembly between main rod and vertical piece, ensure that nut is accurately aligned with mounting hole in full stroke, improve the embedding quality and yield.

Description

Technical Field

[0001] This invention relates to the field of nut hot pressing equipment, and more specifically to a hot pressing equipment for automotive battery box nuts. Background Technology

[0002] In the manufacturing process of automotive battery boxes, it is often necessary to embed metal nuts into the plastic shell of the battery box to facilitate the bolt connection of subsequent battery modules, covers, and other components. Hot pressing is one common process, which involves heating the metal nut to a temperature higher than the melting point of the plastic, and then pressing the nut into a pre-set mounting hole on the battery box. This causes the plastic on the hole wall to melt and fill the knurled or other structures around the nut, forming a strong mechanical connection after cooling.

[0003] However, existing nut hot pressing equipment still faces the following technical problems in actual production: When the mounting holes on the battery box are deep, the nut needs to be pressed down for a considerable distance to reach the bottom of the mounting hole or the intended position. Existing equipment typically uses a single pressing method, where the nut is initially aligned with the mounting hole, and then the hot press head drives the nut to complete the full pressing stroke. However, in actual working conditions, there is often a slight deviation in the initial alignment of the nut and the mounting hole. Although this deviation is acceptable when the nut first contacts the hole, it is amplified as the pressing stroke increases. This causes excessive friction, tilting, or even jamming of the nut against the hole wall during pressing, which can affect the installation quality or even damage the battery box components. Nuts are mostly cylindrical, and their minute radial eccentricities or tilts are difficult to directly observe and quantify during clamping and alignment. To achieve high-precision alignment, a mechanism is needed to effectively amplify and reliably detect these minute deviations. In existing technologies, some devices use vision systems for alignment detection, but these systems are costly and sensitive to oil contamination and vibration. Another approach uses contact probes, but the small size of nuts and the narrow detection space make it difficult for traditional probes to directly contact the nut for measurement, and they cannot dynamically detect the coaxiality of the nut with the mounting hole while it is clamped. Furthermore, existing structures struggle to seamlessly integrate the clamping and alignment processes with the heating and pressing down within a compact space without causing motion interference.

[0004] To address this, we designed a hot-pressing device for automotive battery box nuts. Summary of the Invention

[0005] The purpose of this invention is to solve the problems existing in the prior art, and to propose a hot pressing device for automotive battery box nuts.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A hot-pressing device for automotive battery box nuts includes a base and a top frame fixed on the base, and further includes a hot-pressing mechanism, the hot-pressing mechanism comprising: The nut delivery tube is arranged vertically, with its bottom end used to correspond to the mounting holes on the car battery box and its top end used to receive the nuts to be heat-pressed. A radial clamping and correction mechanism is disposed on the lower circumferential side of the nut delivery tube, and includes multiple clamping and correction units distributed circumferentially. Each clamping and correction unit includes: The support assembly is rotatably connected to the side wall of the nut delivery tube and has a vertical member that remains vertical in the initial state. The main rod is slidably connected to the vertical member, and its lower part is provided with a contact member for contacting the nut from the side; A deviation amplification and transmission component is connected between the main rod and the vertical member. It is used to amplify and transmit the minute deflection of the main rod caused by the eccentricity of the nut during vertical movement into a detectable displacement signal. A deviation detection component is fixed to the side wall of the nut delivery tube and is used to receive the displacement signal output by the deviation amplification and transmission component, and to detect the eccentricity direction and eccentricity of the nut. A vertical drive mechanism is installed on the periphery of the nut delivery tube and is used to drive the main rods of each clamping and correction unit to move vertically synchronously. The hot press head, located in the internal channel of the nut delivery tube, can move independently in the vertical direction and is used to heat and press down the nut.

[0007] Preferably, the support assembly includes: An auxiliary block is fixed to the bottom side wall of the nut delivery tube, and a through hole extending vertically is provided inside it. A rotating shaft is mounted on the inner wall of the through hole; The vertical component is a spiral frame, which is rotatably connected to the through hole via the pivot. A torsion spring is provided between the pivot and the inner wall of the through hole, and the torsion spring keeps the spiral frame vertical in the initial state.

[0008] Preferably, the deviation amplification and transmission component includes: The first rack is fixed to the inner wall of the loop frame; The second rack is slidably connected to the inner side wall of the loop frame and is arranged parallel to the first rack; The main gear is rotatably connected to the side wall of the main rod. The first rack and the second rack are located on both sides of the main gear and mesh with the main gear. The frustum block is installed at the bottom end of the second rack.

[0009] Preferably, the deviation detection component includes: A round rod is fixed to the inner wall of the through hole; The calibration block is fixed to the round rod, and a frustum hole is opened on its end face facing the frustum block; An offset sensor, mounted on the calibration block, is used to detect the alignment status of the frustum block and the frustum hole.

[0010] Preferably, the contact element includes: An electric push rod is fixedly connected to the side wall of the main rod. A contact plate, fixed to the movable end of the electric push rod, is used to clamp the nut from the side.

[0011] Preferably, a pressure sensor is embedded in the contact plate, and the pressure sensor is electrically connected to the controller.

[0012] Preferably, the vertical drive mechanism includes: An annular plate is sleeved on the periphery of the nut delivery tube. Multiple rotating seats are evenly distributed and slidably connected to the bottom wall of the annular plate in the circumferential direction. The end of each main rod away from the contact member is rotatably connected to the corresponding rotating seat. Multiple electric slide rails are fixed to the circumferential sidewall of the nut delivery tube; Electric sliders are slidably fitted onto each of the electric slide rails, and multiple electric sliders are jointly fixed to the annular plate.

[0013] Preferably, it also includes a nut vibrating conveyor and a conveying chamber, the conveying chamber being fixed to the bottom wall of the top frame, one end of which is connected to the output end of the nut vibrating conveyor, and the other end is connected to the top end of the nut conveying pipe, forming a Z-shaped nut conveying path.

[0014] Preferably, the conveying chamber is equipped with a first micro cylinder and a push plate. The first micro cylinder is fixed to the side wall of the conveying chamber, and its output end is fixed to the push plate, which is used to push the nut into the nut conveying pipe in the horizontal direction.

[0015] Preferably, the hot pressing mechanism further includes a second micro cylinder, which is fixed to the top wall of the conveying chamber. Its movable end passes through the conveying chamber and is fixed to the hot pressing head, and is used to drive the hot pressing head to move vertically inside the nut conveying tube.

[0016] Compared with existing technologies, the advantages of this invention are: 1. This invention, by setting a deviation amplification and transmission component between the main rod and the vertical component, amplifies the minute deflection caused by the nut's eccentricity into a detectable displacement signal. In conjunction with the deviation detection component, it dynamically senses the direction and amount of eccentricity during the pressing process, and the controller drives the contact component to finely adjust the radial position of the nut. This effectively solves the problem of deviation accumulation and amplification during deep-stroke pressing, ensuring that the nut maintains precise alignment with the mounting hole throughout the entire stroke, avoiding friction, tilting, or jamming, and improving the installation quality and yield. 2. This invention configures pressure sensors on the contact parts and enables the controller to adopt torque control mode. In the initial clamping stage, the nut is flexibly abutted with a preset thrust. When one contact part is corrected, the other contact parts automatically switch to compliant follow-up. This avoids force confrontation and motion interference between multiple electric push rods, which not only ensures the stability of clamping, but also realizes precise fine adjustment of the nut position, preventing damage to the nut surface and overload of the mechanism. 3. This invention places the hot pressing head in the internal channel of the nut conveying pipe, so that the clamping and correction mechanism can be deployed around the periphery of the conveying pipe throughout the process. The independent vertical pressing path of the hot pressing head is not blocked by the external clamping structure. The clamping guide can be maintained until before the start of hot pressing or even during the hot pressing process, avoiding secondary offset caused by premature withdrawal of clamping. It also achieves smooth connection between the two processes in a compact space, improving the working efficiency and connection quality of the equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the external appearance of a hot pressing device for automotive battery box nuts proposed in this invention; Figure 2 This is a vertical cross-sectional view of the structure of the conveying chamber, auxiliary block and nut conveying pipe in the hot pressing equipment for automotive battery box nuts proposed in this invention. Figure 3 for Figure 2 Enlarged schematic diagram of part A of the structure; Figure 4 This is a schematic diagram showing the connection relationship between the auxiliary block, the rotating shaft, and the loop frame in a hot pressing device for automotive battery box nuts proposed in this invention. Figure 5 This is a schematic diagram of the internal structure of the calibration block in a hot-pressing device for an automotive battery box nut proposed in this invention.

[0018] In the diagram: 1. Base; 2. Support column; 3. Top frame; 4. Nut vibratory conveyor; 5. Conveying chamber; 6. Nut conveying pipe; 7. Auxiliary block; 8. Rotating shaft; 9. Torsion spring one; 10. Through hole; 11. Recurved frame; 12. First miniature cylinder; 13. Push plate; 14. Main gear; 15. First rack; 16. Second rack; 17. Frustum block; 18. Round rod; 20. Calibration block; 21. Frustum hole; 22. Offset sensor; 23. Main rod; 24. Rotary seat; 25. Electric push rod; 26. Contact plate; 27. Ring plate; 28. Electric slide rail; 29. ​​Electric slider; 30. Hot press head; 31. Pressure sensor; 32. Receiving groove; 33. Connecting frame; 34. Second miniature cylinder. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Reference Figures 1-5 A hot pressing device for automotive battery box nuts, comprising: The base 1 and the top frame 3 are fixed to the base 1 by multiple support columns 2. A hot pressing mechanism is symmetrically installed on the top frame 3. The hot pressing mechanism includes: a nut vibrating conveyor 4 (such as...). Figure 1 As shown in the figure, the nut vibration conveyor 4 is existing technology and will not be described in detail here.

[0021] The nut conveying pipe 6 is fixed to the bottom wall of the top frame 3 via the connecting frame 33. The top of the nut conveying pipe 6 is fixedly connected to the conveying chamber 5. The top wall of the conveying chamber 5 away from the nut conveying pipe 6 is fixedly connected to the output end of the nut vibrating conveyor 4. The nut vibrating conveyor 4, the conveying chamber 5 and the nut conveying pipe 6 form a Z-shaped cylindrical nut conveying path. Multiple auxiliary blocks 7 are evenly fixed to the bottom side wall of the nut delivery pipe 6. Each auxiliary block 7 has a through hole 10 from top to bottom on its inner wall. The inner wall of the through hole 10 is rotatably connected to a loop frame 11 via a rotating shaft 8. The side wall of the rotating shaft 8 is elastically connected to the inner side wall of the through hole 10 via a torsion spring 9. A barrier block is set between the rotating shaft 8 and the inner wall of the through hole 10. Thus, under the action of the torsion spring 9, the loop frame 11 is in a vertical state in the initial state. The inner sidewall of the spiral frame 11 is provided with a sliding groove, and the main rod 23 is slidably connected inside the sliding groove. The main gear 14 is rotatably connected to the sidewall of the main rod 23. The inner sidewall of the spiral frame 11 is fixed with a first rack 15, and the inner sidewall of the spiral frame 11 is slidably connected with a second rack 16. The first rack 15 meshes with the main gear 14, and the second rack 16 meshes with the main gear 14. The first rack 15 and the second rack 16 are respectively located on both sides of the main gear 14. A frustum block 17 is mounted on the bottom end of the second rack 16 via a ball joint. A calibration block 20 is fixed to the inner wall of the through hole 10 via a round rod 18. A frustum hole 21 is opened at the end of the calibration block 20 near the second rack 16. Multiple offset sensors 22 are mounted on the calibration block 20. The offset sensors 22 are through-beam photoelectric sensors, which include a transmitter and a receiver. The transmitter and receiver are respectively embedded on both sides of the inner wall of the frustum hole 21 and are arranged opposite to each other. When the frustum block 17 is inserted into the frustum hole 21 in the center, the light path is not blocked and the receiver outputs a normal signal. When the frustum block 17 is offset, the light path is partially or completely blocked and the receiver outputs a weakened signal. The controller calculates the eccentricity direction and eccentricity based on the signal strength difference of each channel of the receiver.

[0022] An electric push rod 25 is fixedly connected through the side wall of the main rod 23. A contact plate 26 is fixedly connected to the movable end of the electric push rod 25. A pressure sensor 31 is embedded in the side wall of the contact plate 26. The offset sensor 22 and the electric push rod 25 are electrically connected through the controller. The pressure sensor 31 is also electrically connected to the electric push rod 25 through the controller. Multiple electric slide rails 28 are fixed to the circumferential sidewall of the nut delivery pipe 6. Each electric slide rail 28 is slidably fitted with an electric slider 29. Multiple electric sliders 29 are fixed to an annular plate 27. Multiple rotating seats 24 are evenly distributed and slidably connected to the bottom wall of the annular plate 27. The end of each main rod 23 away from the electric push rod 25 is connected to the adjacent rotating seat 24. Specifically, one end of the main rod 23 is connected to the rotating seat 24 through a ball joint or a spherical bearing, so that the main rod 23 can swing relative to the rotating seat 24 in any direction. The rotating seat 24 is slidably connected inside the radial slide rail set on the bottom wall of the annular plate 27.

[0023] The conveyor hopper 5 is internally equipped with a first micro cylinder 12 and a second micro cylinder 34 (e.g., Figure 2 As shown), the inner wall of the top of the conveying chamber 5 is provided with a receiving groove 32. A second micro cylinder 34 is installed on the top wall of the conveying chamber 5. The movable end of the second micro cylinder 34 passes through the top wall of the conveying chamber 5 and is fixedly connected to a hot press head 30. It can drive the hot press head 30 to heat and press down the nut to complete the hot press connection with the preset mounting hole on the car battery box. The first micro cylinder 12 is fixedly connected to the side wall of the conveying chamber 5. Its output end passes through the side wall of the conveying chamber 5 and is fixedly connected to a push plate 13, which can push the nut to move in the horizontal direction.

[0024] In this invention, the nut vibration conveyor 4 conveys the nuts one by one to the nut conveying tube 6. The nut conveying tube 6 is located slightly above the preset mounting hole on the car battery box. After the nut slides down the conveying tube 6, it contacts the upper surface of the preset mounting hole on the car battery box.

[0025] Multiple electric push rods 25 are activated. The movable end of the electric push rod 25 causes the contact plate 26 to slightly abut against the side wall of the nut. The pressure sensor 31 provides feedback to the electric push rod 25. The multiple electric push rods 25 immediately drive the contact plate 26 to clamp the nut from the side, so that the nut is suspended directly above the mounting hole.

[0026] Then, multiple electric sliders 29 are activated. The electric sliders 29 move downward in the vertical direction along the electric slide rail 28, which in turn drives the annular plate 27 fixed to it to move synchronously. The annular plate 27 moves downward, and then the annular plate 27 will drive the main rod 23 to move downward in the vertical direction synchronously through the rotating seat 24. The main rod 23 drives the electric push rod 25 to move downward in the vertical direction synchronously. The electric push rod 25 drives the contact plate 26 to slide downward in the vertical direction. Simultaneously, the main rod 23 drives the main gear 14 to move downwards synchronously. Since the main gear 14 meshes with the first rack 15, and the second rack 16 meshes with the main gear 14, the main gear 14 will double the movement distance of the second rack 16 during its movement. Consequently, the contact plate 26 only needs to move downwards a small distance for the second rack 16 to amplify that movement distance. Furthermore, the second rack 16 remains parallel to the main rod 23. If there is a slight deviation in the mounting hole of the cylindrical nut on the car battery box, the corresponding contact plate 26 will be forced to move a small distance. While the electric push rod 25 makes fine adjustments to its position based on the deviation signal, the other electric push rods 25 switch to force control mode, providing only smooth follow-up resistance. To avoid motion interference, the main rod 23 drives the loop frame 11 to compress the torsion spring 9, causing a slight offset. With the second rack 16 moving downwards at double the distance, this offset is amplified more significantly. The second rack 16 then drives the frustum block 17, which is fixed to it, downwards. The frustum block 17 and the calibration block 20 cannot be inserted. During this process, the offset sensor 22 detects the alignment deviation between the frustum block 17 and the frustum hole 21 in real time. The offset sensor 22 then transmits the signal to the electric push rod 25. The electric push rod 25 finely adjusts the position of the contact plate 26 according to the direction of the deviation, causing the nut to move slightly until the frustum block 17 can be smoothly inserted into the frustum hole 21. At this point, the position of the cylindrical nut is precisely aligned with the mounting hole. For mounting holes requiring deep hot pressing of the cylindrical nut, this mechanism helps to predict the stroke of the cylindrical nut in advance, avoiding deviations caused by excessive downward pressure during the pressing process.

[0027] That is: multiple electric push rods 25 are activated, causing their moving ends to drive the contact plate 26 to slightly contact the nut from the side. Each electric push rod 25 is in torque control mode, using a preset small thrust to make the contact plate 26 flexibly abut against the side wall of the nut. At this time, the contact plate 26 can passively move with the position of the nut. The electric slider 29 drives the annular plate 27 to slowly move down. If there is a deviation in the position of the nut, the contact plate 26 at the corresponding position will be subjected to the reaction force of the nut's eccentricity. This force is transmitted through the main rod 23, causing the loop frame 11 to deflect slightly around the rotating shaft 8. The second rack 16 amplifies this deflection and transmits it to the frustum block 17. The offset sensor 22 detects the alignment deviation between the frustum block 17 and the frustum hole 21 and outputs the deviation signal to the controller. The controller controls the corresponding electric push rod 25 to make a fine adjustment of its position according to the deviation signal. The remaining electric push rods 25 maintain the torque control mode to provide smooth follow-up until the offset sensor 22 detects that the frustum block 17 and the frustum hole 21 are aligned. At this time, the nut and the mounting hole are precisely aligned.

[0028] Subsequently, the second micro cylinder 34 is activated again, driving the hot press head 30 to apply greater downward pressure. Simultaneously, the hot press head 30 heats the cylindrical nut, which is an insert nut with knurled edges. The end of the hot press head 30 has a heating chamber to accommodate and heat the cylindrical nut. During operation, the hot press head 30 heats the cylindrical nut above the plastic's melting point and presses it into the mounting hole. The plastic around the mounting hole melts and fills the knurled gaps, forming a secure connection after cooling. After connection, the electric slider 29 moves the annular plate 27 upward, the electric push rod 25 retracts the contact plate 26, and the loop frame 11 returns to a vertical position under the action of the torsion spring 9, awaiting the next hot pressing operation of the cylindrical nut.

[0029] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A hot pressing device for automotive battery box nuts, comprising a base (1) and a top frame (3) fixed on the base (1), characterized in that, It also includes a hot pressing mechanism, which comprises: Nut delivery tube (6) is arranged in the vertical direction. Its bottom end is used to correspond to the mounting hole on the car battery box, and its top end is used to receive the nut to be heat-pressed. A radial clamping and correction mechanism is disposed on the lower circumferential side of the nut delivery tube (6), and includes multiple clamping and correction units distributed circumferentially. Each clamping and correction unit includes: The bracket assembly is elastically rotatably connected to the side wall of the nut delivery tube (6) and has a vertical member that remains vertical in the initial state; The main rod (23) is slidably connected to the vertical member, and its lower part is provided with a contact member for contacting the nut from the side; The deviation amplification and transmission component is connected between the main rod (23) and the vertical member. It is used to amplify and transmit the slight deflection of the main rod (23) caused by the eccentricity of the nut during the vertical movement into a detectable displacement signal. The deviation detection component is fixed to the side wall of the nut delivery tube (6) and is used to receive the displacement signal output by the deviation amplification and transmission component and detect the eccentricity direction and eccentricity of the nut. A vertical drive mechanism is installed on the periphery of the nut delivery tube (6) to drive the main rod (23) of each clamping and correction unit to move vertically synchronously. The hot press head (30) is located in the internal channel of the nut delivery tube (6) and can move independently in the vertical direction to heat and press down the nut.

2. The hot pressing equipment for automotive battery box nuts according to claim 1, characterized in that, The support assembly includes: An auxiliary block (7) is fixed to the bottom side wall of the nut delivery pipe (6), and a through hole (10) extending in the vertical direction is provided inside it. A rotating shaft (8) is mounted on the inner wall of the through hole (10); The vertical component is a spiral frame (11), which is rotatably connected to the through hole (10) by the rotating shaft (8). A torsion spring (9) is provided between the rotating shaft (8) and the inner wall of the through hole (10), and the torsion spring (9) keeps the spiral frame (11) vertical in the initial state.

3. The hot pressing equipment for automotive battery box nuts according to claim 2, characterized in that, The deviation amplification and transmission component includes: The first rack (15) is fixed to the inner wall of the loop frame (11); The second rack (16) is slidably connected to the inner wall of the loop frame (11) and is arranged parallel to the first rack (15); The main gear (14) is rotatably connected to the side wall of the main rod (23). The first rack (15) and the second rack (16) are located on both sides of the main gear (14) and are meshed with the main gear (14). The frustum block (17) is installed at the bottom end of the second rack (16).

4. The hot pressing equipment for automotive battery box nuts according to claim 3, characterized in that, The deviation detection component includes: A round rod (18) is fixed to the inner wall of the through hole (10); The calibration block (20) is fixed to the round rod (18), and a frustum hole (21) is opened on its end face facing the frustum block (17). An offset sensor (22) is mounted on the calibration block (20) to detect the alignment status of the frustum block (17) and the frustum hole (21).

5. The hot pressing equipment for automotive battery box nuts according to claim 1, characterized in that, The contact element includes: An electric push rod (25) is fixedly connected to the side wall of the main rod (23); The contact plate (26) is fixed to the movable end of the electric push rod (25) and is used to clamp the nut from the side.

6. The hot pressing device for automotive battery box nuts according to claim 5, characterized in that, A pressure sensor (31) is embedded in the contact plate (26).

7. The hot pressing device for automotive battery box nuts according to claim 1, characterized in that, The vertical drive mechanism includes: An annular plate (27) is sleeved on the periphery of the nut delivery tube (6). Multiple rotating seats (24) are evenly distributed and slidably connected to the bottom wall of the annular plate (27) along the circumference. The end of each main rod (23) away from the contact member is rotatably connected to the corresponding rotating seat (24). Multiple electric slide rails (28) are fixed to the circumferential sidewall of the nut delivery tube (6); Electric sliders (29) are slidably fitted on each of the electric slide rails (28), and multiple electric sliders (29) are fixed together to the annular plate (27).

8. The hot pressing device for automotive battery box nuts according to claim 1, characterized in that, It also includes a nut vibrating conveyor (4) and a conveying chamber (5). The conveying chamber (5) is fixed to the bottom wall of the top frame (3). One end of the chamber is connected to the output end of the nut vibrating conveyor (4), and the other end is connected to the top end of the nut conveying pipe (6), forming a Z-shaped nut conveying path.

9. The hot pressing equipment for automotive battery box nuts according to claim 8, characterized in that, The conveying chamber (5) is equipped with a first micro cylinder (12) and a push plate (13). The first micro cylinder (12) is fixed to the side wall of the conveying chamber (5), and its output end is fixed to the push plate (13) for pushing the nut into the nut conveying pipe (6) in the horizontal direction.

10. A hot pressing device for automotive battery box nuts according to claim 9, characterized in that, The hot pressing mechanism also includes a second micro cylinder (32), which is fixed to the top wall of the conveying chamber (5). Its movable end passes through the conveying chamber (5) and is fixed to the hot pressing head (30), and is used to drive the hot pressing head (30) to move vertically in the nut conveying tube (6).

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