Foaming furnace needle plate manual adjustment type cleaning device

Abstract

The utility model discloses a foaming furnace needle plate manual regulation type dirt cleaning device, including left vertical fixedly arranged ground and right vertical column, left vertical column and right vertical column are located left side horizontal track's left side and right side horizontal track's right side respectively, and the upper end between left vertical column and right vertical column is connected through the horizontal setting crossbeam along left and right direction, and the crossbeam is located horizontal track top, and two roots are equipped with in the crossbeam front and back side by side, and the left side and right side of crossbeam are equipped with a set of electric rolling brush device for cleaning and brushing needle plate and aluminum base surface dirt respectively. The utility model provides the dirt cleaning device principle science, convenient to use, and the dirt cleaning efficiency is high, can realize on -line dirt cleaning. Adopt manual regulation electric rolling brush device left and right movement and needle plate and aluminum base contact or separate, can make rotary disc end face disc steel wire brush more convenient, more large area and aluminum base outside inclined surface contact, thereby make dirt cleaning range bigger, effect better.

Description

Technical Field

[0001] This utility model belongs to the field of PVC calendered artificial leather production technology, specifically relating to a manually adjustable cleaning device for the needle plate of a foaming furnace. Background Technology

[0002] Foamed PVC calendered artificial leather undergoes foaming in a foaming oven (also called a foaming drying oven). Before entering the foaming process, the semi-finished artificial leather undergoes a calendering process to bond the PVC plastic to the base fabric. The portion of the base fabric wider than the PVC plastic surface is called the selvage. The left and right selvages are approximately the same width and symmetrically distributed. During the foaming process, if... Figure 1 and Figure 2 As shown, the two sides of the artificial leather semi-finished product 1 are hung longitudinally on the needle plates 2 on the left and right sides respectively. The needle plates 2 are fixed on the aluminum base 3, which is fixed on the chain 6 that can slide longitudinally along the longitudinal groove 5 of the horizontal track 4. Driven by the chain 6, the artificial leather semi-finished product 1 is driven by the aluminum base 3 and the needle plates to enter from the front inlet of the foaming oven and exit from the rear outlet. Because the artificial leather semi-finished product 1 contains the plasticizer DOP, at a temperature as high as 220-230℃, DOP vaporizes into gas and forms dense smoke. The dense smoke forms oil droplets or oil film when it cools down and accumulates on the needle plates 2. If the metal surfaces of the aluminum base 3 and chain 6 are not effectively cleaned, they will carbonize. The carbon deposits (commonly known as coke) accumulate and become thicker, making them increasingly difficult to clean and forming stubborn dirt. The hazards are as follows: 1) The coke will break and splatter a lot of black impurities, which will form black spots on the PVC plastic surface, especially on light-colored PVC plastic surfaces, seriously affecting product quality; 2) The thick accumulation of coke on the surface of the needle plate 2 reduces the length of the protruding hanging needles 7 on the needle plate, and the fabric edge is only partially hooked on the needle tip, making it easy to detach from the needle tip and unable to be properly stretched and shaped. Currently, cleaning the needle plate usually involves manually cleaning the needle plate and aluminum base one by one with a brush or electric roller after the machine is stopped. This is not only labor-intensive and inefficient, but the hanging needles on the needle plate can also easily injure the cleaner. At the same time, the cleaning operation affects the continuous production and the cleaning effect is not good. Utility Model Content

[0003] Based on the technical problem that the metal surfaces such as needle plates, aluminum seats, and chains should be kept clean and free of charred material and debris, this utility model provides a safe, reliable, non-stop, and highly effective manually adjustable cleaning device for the needle plates of a foaming furnace.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a manually adjustable cleaning device for the needle plate of a foaming furnace, which is set on the rear side of the outside of the foaming furnace, including a left column and a right column that are both vertically fixed to the ground. The left column and the right column are located on the left side of the left horizontal track and the right side of the right horizontal track, respectively. The upper ends of the left column and the right column are connected by a horizontal beam arranged horizontally in the left and right direction. The horizontal beam is located above the horizontal track, and two horizontal beams are arranged side by side. An electric roller brush device for cleaning the needle plate and the surface of the aluminum seat is provided on the left and right sides of the horizontal beam, respectively.

[0005] Each electric roller brush device includes an outer frame, an inner frame, a transverse guide rail, a transverse drive shaft, a lifting driver, an angle adjustment seat, a cleaning motor, and a rotating disk. Each crossbeam is fixed with one of the aforementioned transverse guide rails. The upper front and rear sides of the outer frame are provided with horizontal sliders that are slidably connected to the transverse guide rails. The lifting driver is fixed on the top of the outer frame. The inner frame is vertically slidably connected to the inside of the outer frame. The lower end of the lifting driver passes downward through the top of the outer frame and connects to the top of the inner frame. Vertical slide rails are provided on the outer frame on the front and rear sides of the inner frame. Lifting sliders that are slidably connected to the vertical slide rails are provided on the front and rear sides of the inner frame. The transverse drive shaft is located below the crossbeam and parallel to the crossbeam. A rotational motion to linear motion component is provided between the transverse drive shaft and the outer frame. The tilt adjustment seat is located on the inner frame, the cleaning motor is located on the tilt adjustment seat, the rotating disk is mounted on the main shaft of the cleaning motor, the outer circle of the rotating disk is provided with an annular steel wire brush for cleaning the needle plate, and the end face of the rotating disk is provided with a disc steel wire brush for cleaning the aluminum seat.

[0006] The rotary-to-linear motion assembly includes a first hanger, a second hanger, an external threaded sleeve, two translation nuts, and two pressure bearings. The first and second hangers are spaced apart on the left and right sides between two crossbeams. The transverse drive shaft is rotatably connected to the first and second hangers via bearings. The external threaded sleeve is fitted onto the transverse drive shaft and located between the first and second hangers. The inner circle of the external threaded sleeve is connected to the outer circle of the transverse drive shaft via a key. The two translation nuts are respectively located on the left and right sides of the outer frame and are threadedly connected to the outer circle of the external threaded sleeve. Both pressure bearings are installed on the outer circle of the transverse drive shaft. One pressure bearing is located between the left end of the transverse drive shaft and the first hanger, and the other pressure bearing is located between the right end of the transverse drive shaft and the second hanger.

[0007] The tilt adjustment seat includes a motor base and two adjustment bolts. The bottom of the motor base is rotatably connected to the bottom of the inner frame via a hinge. The hinge axis of the hinge runs along the front-to-back direction. The two adjustment bolts are located on the left and right sides of the hinge, respectively. The upper end of the adjustment bolt is hinged to the bottom of the motor base, and the lower end of the adjustment bolt passes through the bottom of the inner frame and is threaded with an adjustment nut. The top surface of the adjustment nut is pressed against the bottom of the inner frame.

[0008] The lifting drive uses a stroke-adjustable cylinder, and the lower end of the piston rod of the stroke-adjustable cylinder is hinged to the top of the inner frame.

[0009] A handwheel is provided at the outer end of the transverse drive shaft, and the transverse drive shaft is rotatably connected between the two crossbeams through a bearing seat adjacent to the handwheel.

[0010] By adopting the above technical solution, this utility model has the following technical effects: (1) When PVC calendered artificial leather is foamed in a foaming oven (also called a foaming oven), the fabric edges on the left and right sides of the base fabric are respectively attached to the needle plates on the left and right sides. The chains on the left and right sides of the foaming oven move back and forth in the longitudinal chute in the horizontal track. The chains drive the aluminum seat and the needle plates attached to the fabric edges to move from front to back. The artificial leather semi-finished product enters from the front entrance of the foaming oven. After being foamed in the foaming oven, the artificial leather semi-finished product comes out from the rear exit. The fabric edges on the left and right sides of the foamed product are separated from the needle plates, supported by the guide rollers and conveyed to the rear. The chain drives the aluminum seat and needle plates to turn from back to front at the sprocket at the rear end. Two sets of electric roller brush devices clean the dirt on the surface of the needle plates and aluminum seats. The top open dirt boxes are placed directly below the two sets of electric roller brush devices. The cleaned dirt falls into the dirt boxes for collection.

[0011] (2) The distance between the two horizontal rails (the distance between the left and right side needle plates) will widen or narrow as the width of the artificial leather product changes. When adjusting the distance between the two horizontal rails, the mechanical power drives several rail spacing adjustment screws to rotate simultaneously. Since the threads at the left and right ends of the rail spacing adjustment screws turn in opposite directions, the rail nuts connected to the bottom of the horizontal rails move left and right synchronously on the rail spacing adjustment screws, thereby realizing the adjustment of the distance between the two horizontal rails.

[0012] Handwheels are used on the left side of the left column and the right side of the right column to control the left and right positions of the electric roller brush device. The specific manual operation process is as follows: Rotate the handwheel to drive the horizontal drive shaft to rotate. The horizontal drive shaft drives the external threaded sleeve to rotate via a flat key. The left and right ends of the external threaded sleeve are respectively connected to the first and second hangers by a pressure bearing. Therefore, the external threaded sleeve can only rotate with the horizontal drive shaft and cannot move axially. The two translation nuts screwed to the external threaded sleeve move left and right axially, driving the outer frame, inner frame, tilt adjustment seat, cleaning motor and rotating disk to move left and right along the horizontal guide rail at the top of the crossbeam until the bottom of the rotating disk contacts the needle plate and aluminum seat, then stop rotating the handwheel. When the electric roller brush device needs maintenance or when cleaning of the needle plate and aluminum seat is not required, rotate the handwheel to disengage the bottom of the annular wire brush from the needle plate and aluminum seat.

[0013] (3) When online cleaning is required, start the lifting drive. The piston rod of the lifting drive (adjustable stroke cylinder) extends, driving the inner frame to move downward until the annular wire brush contacts the needle plate. Then, turn off the lifting drive and tighten the cylinder stroke locking nut at the top of the adjustable stroke cylinder to lock the piston rod length. Start the cleaning motor to drive the rotating disk to rotate. The annular wire brush on the outer circle of the rotating disk cleans the needle plate as it returns from back to front, while the circular wire brush cleans the outer surface of the aluminum base.

[0014] Since the outer vertical surface of the aluminum base is sloped, the tilt adjustment seat can be adjusted to ensure that this surface is also cleaned. Specifically, first loosen the adjusting nut at the lower end of the adjusting bolt furthest from the aluminum base, then tighten the adjusting nut at the lower end of the adjusting bolt adjacent to the aluminum base. Rotate the motor base by a certain angle using the hinge at the bottom until the center line of the rotating disk is perpendicular to the outer vertical surface of the aluminum base. Then tighten both adjusting nuts. By coordinating this with the handwheel to drive the left and right movement of the rotating seat and the lifting adjustment of the lifting drive, a thorough cleaning of the outer vertical surface of the aluminum base can be achieved.

[0015] In summary, this utility model solves the shortcomings of traditional cleaning devices, such as low cleaning efficiency, high labor intensity, poor effect, inability to achieve online cleaning leading to prolonged accumulation of dirt on the needle plate, increasing cleaning difficulty, and reduced effective production time due to shutdown for cleaning. The cleaning device provided by this utility model is scientifically based, easy to use, and highly efficient, enabling online cleaning. The manually adjustable electric roller brush device moves left and right to contact or separate from the needle plate and aluminum base, allowing the circular wire brush on the end face of the rotating disc to make more convenient and larger-area contact with the outer inclined surface of the aluminum base, thus resulting in a larger cleaning range and better effect. Attached Figure Description

[0016] Figure 1 This is a top view of the horizontal track, chain, aluminum base, and needle plate of this utility model. Figure 2 This is a schematic diagram of the cross-sectional structure of the horizontal track, chain, aluminum base and needle plate in this utility model; Figure 3 This is a schematic diagram of the layout of this utility model in a foaming furnace production line; Figure 4 for Figure 3 An enlarged view of this utility model; Figure 5 for Figure 4 The right view; Figure 6 for Figure 5 Enlarged view of section A in the middle; Figure 7 for Figure 6 Left view of the electric roller brush device; Figure 8 for Figure 7 Three-view diagram of the Chinese and foreign framework; Figure 9 for Figure 7 Three views of the inner frame. Detailed Implementation

[0017] like Figures 1-9 As shown, the manual adjustable cleaning device for the needle plate of the foaming furnace of this utility model is set on the rear side of the outside of the foaming furnace 12. It includes a left column 13 and a right column 14, both of which are vertically fixed to the ground. The left column 13 and the right column 14 are located on the left side of the left horizontal track 4 and the right side of the right horizontal track 4, respectively. The upper ends of the left column 13 and the right column 14 are connected by a horizontal beam 15 arranged horizontally in the left and right direction. The horizontal beam 15 is located above the horizontal track 4. Two horizontal beams 15 are arranged side by side. On the left and right sides of the horizontal beam 15, there is an electric roller brush device 16 for cleaning the dirt on the surface of the needle plate 2 and the aluminum seat 3.

[0018] Each set of electric roller brush device 16 includes an outer frame 20, an inner frame 21, a transverse guide rail 22, a transverse drive shaft 23, a lifting driver 24, an angle adjustment seat 25, a cleaning motor 26, and a rotating disk 27. One of the aforementioned transverse guide rails 22 is fixedly mounted on each crossbeam 15. Horizontal sliders 28 are slidably connected to the transverse guide rails 22 on both the front and rear sides of the upper part of the outer frame 20. The lifting driver 24 is fixedly mounted on the top of the outer frame 20. The inner frame 21 is vertically slidably connected inside the outer frame 20. The lower end of the lifting driver 24 passes downwards through... The top of the outer frame 20 is connected to the top of the inner frame 21. Vertical slide rails 29 are respectively provided on the outer frame 20 on the front and rear sides of the inner frame 21. Lifting sliders 30 that are slidably connected to the vertical slide rails 29 are respectively provided on the front and rear sides of the inner frame 21. The transverse drive shaft 23 is located below the crossbeam 15 and parallel to the crossbeam 15. A handwheel 18 is provided at the outer end of the transverse drive shaft 23. The transverse drive shaft 23 is rotatably connected between the two crossbeams 15 through the bearing seat 17 adjacent to the handwheel 18. A rotary motion to linear motion assembly is provided between the transverse drive shaft 23 and the outer frame 20. The tilt adjustment seat 25 is mounted on the inner frame 21, the cleaning motor 26 is mounted on the tilt adjustment seat 25, the rotating disk 27 is mounted on the main shaft of the cleaning motor 26, the outer circle of the rotating disk 27 is provided with an annular steel wire brush 32 for cleaning the needle plate 2, and the end face of the rotating disk 27 is provided with a disc steel wire brush 33 for cleaning the aluminum seat 3.

[0019] The rotary-to-linear motion assembly includes a first hanger 34, a second hanger 35, an external threaded sleeve 36, two translation nuts 37, and two pressure bearings 38. The first hanger 34 and the second hanger 35 are spaced apart between the two crossbeams. The transverse drive shaft 23 is rotatably connected to the first hanger 34 and the second hanger 35 through bearings. The external threaded sleeve 36 is fitted onto the transverse drive shaft 23 and located between the first hanger 34 and the second hanger 35. The inner circle of the external threaded sleeve 36 is connected to the outer circle of the transverse drive shaft 23 by a key. The two translation nuts 37 are respectively located on the left and right sides of the outer frame 20. The two translation nuts 37 are simultaneously threadedly connected to the outer circle of the external threaded sleeve 36. The two pressure bearings 38 are both installed on the outer circle of the transverse drive shaft 23. One pressure bearing 38 is located between the left end of the transverse drive shaft 23 and the first hanger 34, and the other pressure bearing 38 is located between the right end of the transverse drive shaft 23 and the second hanger 35.

[0020] The tilt adjustment seat 25 includes a motor seat 39 and two adjusting bolts 40. The bottom of the motor seat 39 is rotatably connected to the bottom of the inner frame 21 via a hinge 41. The hinge axis of the hinge 41 is along the front-back direction. The two adjusting bolts 40 are located on the left and right sides of the hinge 41, respectively. The upper end of the adjusting bolt 40 is hinged to the bottom of the motor seat 39, and the lower end of the adjusting bolt 40 passes through the bottom of the inner frame 21 and is threaded with an adjusting nut 42. The top surface of the adjusting nut 42 is pressed against the bottom of the inner frame 21.

[0021] The lifting drive 24 uses a stroke adjustable cylinder, and the lower end of the piston rod of the stroke adjustable cylinder is hinged to the top of the inner frame 21.

[0022] The working principle and process of this utility model are as follows: (1) When PVC calendered artificial leather is foamed in a foaming oven (also called a foaming oven), the left and right sides of the base fabric are respectively attached to the left and right needle plates 2. The chains 6 on the left and right sides of the foaming oven 12 move back and forth in the longitudinal slid 5 in the horizontal track 4. The chains 6 drive the aluminum seat 3 and the needle plate 2 attached to the fabric to move from front to back. It enters from the front entrance of the foaming oven 12. After the artificial leather semi-finished product is foamed in the foaming oven 12, it comes out from the rear exit. The fabric edges on the left and right sides of the foamed product are separated from the needle plate 2, supported by the guide roller and conveyed to the rear. The chains 6 drive the aluminum seat 3 and the needle plate 2 to turn from back to front at the sprocket at the rear end. The online electric cleaning mechanism 10 cleans the surface of the needle plate 2 and the aluminum seat 3. The top open dirt box is placed directly below the two sets of electric roller brush devices 16. The cleaned dirt falls into the dirt box for collection.

[0023] (2) The distance between the two horizontal rails 4 (the distance between the left and right side needle plates) will widen or narrow as the width of the artificial leather product changes. When adjusting the distance between the two horizontal rails 4, the mechanical power drives several rail spacing adjustment screws 19 to rotate simultaneously through the worm gear mechanism 64. Since the threads at the left and right ends of the rail spacing adjustment screws 19 turn in opposite directions, the rail nuts connected to the bottom of the horizontal rails 4 move left and right synchronously on the rail spacing adjustment screws 19, thereby realizing the adjustment of the distance between the two horizontal rails 4.

[0024] A handwheel 18 is used on the left side of the left column 13 and the right side of the right column 14 to control the left and right positions of the electric roller brush device 16. The specific manual operation process is as follows: While adjusting the distance between the two horizontal rails, rotate the handwheel 18 to drive the transverse drive shaft 23 to rotate. The transverse drive shaft 23 drives the external threaded sleeve 36 to rotate through a flat key. The left and right ends of the external threaded sleeve 36 are respectively connected to the first hanger 34 and the second hanger 35 through a pressure bearing 38. Therefore, the external threaded sleeve 36 can only rotate with the transverse drive shaft 23 and cannot move axially. The two translation nuts 37 screwed to the external threaded sleeve 36 move left and right along the axial direction, driving the outer frame 20, inner frame 21, tilt adjustment seat 25, cleaning motor 26 and rotating disk 27 to move left and right along the transverse guide rail 22 at the top of the crossbeam 15 until the bottom of the rotating disk 27 contacts the needle plate 2 and the aluminum seat 3, at which point the handwheel 18 is stopped. When the electric roller brush device 16 needs maintenance or when the needle plate 2 and aluminum seat 3 do not need cleaning, simply rotate the handwheel 18 to detach the bottom of the annular wire brush 32 from the needle plate 2 and aluminum seat 3.

[0025] (3) When online cleaning is required, start the lifting drive 24. The piston rod of the lifting drive 24 (adjustable stroke cylinder) extends and drives the inner frame 21 to move downward until the annular wire brush 32 contacts the needle plate 2. Then, turn off the lifting drive 24 and tighten the cylinder stroke locking nut at the upper end of the adjustable stroke cylinder to lock the piston rod length. Start the cleaning motor 26 to drive the rotating disk 27 to rotate. The annular wire brush 32 on the outer circle of the rotating disk 27 cleans the needle plate 2 as it returns from back to front. At the same time, the disc wire brush 33 cleans the outer side of the aluminum base 3.

[0026] Since the outer vertical surface of the aluminum base 3 is sloped, the tilt adjustment seat 25 can be adjusted to clean the outer vertical surface of the aluminum base 3 as well. Specifically, first loosen the adjusting nut 42 at the lower end of the adjusting bolt 40 furthest from the aluminum base 3, then tighten the adjusting nut 42 at the lower end of the adjusting bolt 40 adjacent to the aluminum base 3. Rotate the motor base 39 by a certain angle using the hinge 41 at the bottom until the center line of the rotating disk 27 is perpendicular to the outer vertical surface of the aluminum base 3, then tighten both adjusting nuts 42. Combined with the handwheel 18 driving the left and right movement of the rotating seat 27 and the lifting adjustment of the lifting drive 24, a comprehensive cleaning of the outer vertical surface of the aluminum base 3 can be achieved.

[0027] The above embodiments illustrate the basic principles and features of this utility model. However, the above descriptions are merely preferred embodiments and are not limited to these embodiments. Those skilled in the art, inspired by this patent, can make many modifications and improvements without departing from the spirit and scope of the claims, all of which fall within the protection scope of this utility model. Therefore, the patent and its scope of protection should be determined by the appended claims.

Claims

1. A manually adjustable cleaning device for the needle plate of a foaming furnace, located on the rear side of the exterior of the foaming furnace, characterized in that: It includes a left column and a right column that are both vertically fixed to the ground. The left column and the right column are located on the left side of the left horizontal track and the right side of the right horizontal track, respectively. The upper ends of the left column and the right column are connected by a horizontal beam that is set horizontally in the left and right direction. The horizontal beam is located above the horizontal track. There are two horizontal beams arranged side by side. On the left and right sides of the horizontal beam, there is a set of electric roller brush devices for cleaning dirt on the needle plate and aluminum seat surface.

2. The manually adjustable cleaning device for the needle plate of the foaming furnace according to claim 1, characterized in that: Each electric roller brush device includes an outer frame, an inner frame, a transverse guide rail, a transverse drive shaft, a lifting driver, an angle adjustment seat, a cleaning motor, and a rotating disk. Each crossbeam is fixed with one of the aforementioned transverse guide rails. The upper front and rear sides of the outer frame are provided with horizontal sliders that are slidably connected to the transverse guide rails. The lifting driver is fixed on the top of the outer frame. The inner frame is vertically slidably connected to the inside of the outer frame. The lower end of the lifting driver passes downward through the top of the outer frame and connects to the top of the inner frame. Vertical slide rails are provided on the outer frame on the front and rear sides of the inner frame. Lifting sliders that are slidably connected to the vertical slide rails are provided on the front and rear sides of the inner frame. The transverse drive shaft is located below the crossbeam and parallel to the crossbeam. A rotational motion to linear motion component is provided between the transverse drive shaft and the outer frame. The tilt adjustment seat is located on the inner frame, the cleaning motor is located on the tilt adjustment seat, the rotating disk is mounted on the main shaft of the cleaning motor, the outer circle of the rotating disk is provided with an annular steel wire brush for cleaning the needle plate, and the end face of the rotating disk is provided with a disc steel wire brush for cleaning the aluminum seat.

3. The manually adjustable cleaning device for the needle plate of the foaming furnace according to claim 2, characterized in that: The rotary-to-linear motion assembly includes a first hanger, a second hanger, an external threaded sleeve, two translation nuts, and two pressure bearings. The first and second hangers are spaced apart on the left and right sides between two crossbeams. The transverse drive shaft is rotatably connected to the first and second hangers via bearings. The external threaded sleeve is fitted onto the transverse drive shaft and located between the first and second hangers. The inner circle of the external threaded sleeve is connected to the outer circle of the transverse drive shaft via a key. The two translation nuts are respectively located on the left and right sides of the outer frame and are threadedly connected to the outer circle of the external threaded sleeve. Both pressure bearings are installed on the outer circle of the transverse drive shaft. One pressure bearing is located between the left end of the transverse drive shaft and the first hanger, and the other pressure bearing is located between the right end of the transverse drive shaft and the second hanger.

4. The manually adjustable cleaning device for the needle plate of the foaming furnace according to claim 2 or 3, characterized in that: The tilt adjustment seat includes a motor base and two adjustment bolts. The bottom of the motor base is rotatably connected to the bottom of the inner frame via a hinge. The hinge axis of the hinge runs along the front-to-back direction. The two adjustment bolts are located on the left and right sides of the hinge, respectively. The upper end of the adjustment bolt is hinged to the bottom of the motor base, and the lower end of the adjustment bolt passes through the bottom of the inner frame and is threaded with an adjustment nut. The top surface of the adjustment nut is pressed against the bottom of the inner frame.

5. The manually adjustable cleaning device for the needle plate of the foaming furnace according to claim 2 or 3, characterized in that: The lifting drive uses a stroke-adjustable cylinder, and the lower end of the piston rod of the stroke-adjustable cylinder is hinged to the top of the inner frame.

6. The manually adjustable cleaning device for the needle plate of the foaming furnace according to claim 2 or 3, characterized in that: A handwheel is provided at the outer end of the transverse drive shaft, and the transverse drive shaft is rotatably connected between the two crossbeams through a bearing seat adjacent to the handwheel.

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