Industrial vehicle steering control device

Abstract

This invention provides a steering control device for industrial vehicles, including a support plate, a steering wheel, and an incremental encoder assembly. The support plate is fixed to the frame of the industrial vehicle, the incremental encoder assembly is fixed to the bottom of the support plate, and the rotating shaft of the incremental encoder assembly moves from bottom to top through the support plate and extends out of the support plate. The steering wheel is coaxially fixed to the upper end of the rotating shaft, and the wiring harness of the incremental encoder assembly is electrically connected to a controller inside the industrial vehicle. When the steering wheel drives the rotating shaft of the incremental encoder assembly to rotate, the incremental encoder assembly transmits the electrical signals consisting of the steering direction and steering angle to the controller. When applied to existing industrial vehicles, this invention simplifies the structural complexity of existing steering control devices and reduces assembly and maintenance difficulties.

Description

Technical Field

[0001] This invention relates to the field of industrial vehicle steering control system technology, and more specifically, to an industrial vehicle steering control device. Background Technology

[0002] Most industrial vehicles currently on the market, including reach trucks and order pickers, have steering control devices composed of independent components such as steering wheels, mounting bases, dampers, couplings, and encoders. These devices suffer from complex structures, cumbersome assembly, and inconvenient maintenance. The purpose of this application is to provide an industrial vehicle steering control device that simplifies the structural complexity of existing industrial vehicle steering control devices and reduces assembly and maintenance difficulties. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an industrial vehicle steering control device, which, when applied to existing industrial vehicles, can simplify the structural complexity of existing steering control devices and reduce assembly and maintenance difficulties.

[0004] This invention provides a steering control device for an industrial vehicle, including a support plate, a steering wheel, and an incremental encoder assembly. The support plate is fixed to the frame of the industrial vehicle, the incremental encoder assembly is fixed to the bottom of the support plate, and the rotating shaft of the incremental encoder assembly moves from bottom to top through the support plate and extends out of the support plate. The steering wheel is coaxially fixed to the upper end of the rotating shaft, and the wiring harness of the incremental encoder assembly is electrically connected to a controller inside the industrial vehicle. When the steering wheel drives the rotating shaft of the incremental encoder assembly to rotate, the incremental encoder assembly transmits the electrical signals consisting of the steering direction and steering angle to the controller.

[0005] By adopting the above structure, the present invention enables the steering wheel to be directly connected to the shaft in the incremental encoder assembly, and the incremental encoder assembly can directly transmit the electrical signal consisting of the steering direction and steering angle to the controller when the steering wheel drives the shaft to rotate. This simplifies the structural complexity of the steering control device in existing industrial vehicles and reduces assembly and maintenance difficulties.

[0006] In one possible implementation, the incremental encoder assembly includes a support base, a control circuit board, and a housing. The upper end of the support base is fixed to the bottom of a support plate, and the lower end of a rotating shaft passes through the support base and is rotatably connected to it. A magnet is coaxially embedded in the lower end of the rotating shaft. The control circuit board is fixed to the inner side of the lower end of the support base, and a Hall sensor is mounted on the upper surface of the control circuit board. The magnet and the Hall sensor are vertically opposite each other and have a clearance fit. The housing is fixed to the lower end of the support base, and a wiring hole is provided at the bottom of the housing. The connecting wires of the control circuit board are led out through the wiring hole and electrically connected to the controller. When the steering wheel drives the rotating shaft to rotate, the magnet triggers the Hall sensor, and the control circuit board transmits the electrical signal consisting of the steering direction and steering angle to the controller. By using this incremental encoder assembly, when the steering wheel drives the rotating shaft to rotate, the magnet can trigger the Hall sensor, and the control circuit board can transmit the electrical signal consisting of the steering direction and steering angle to the controller. At this time, the controller can control the steering motor in the industrial vehicle to move, that is, the steering motor can drive the wheels to rotate in the corresponding direction by the corresponding angle, thereby realizing the steering control of the industrial vehicle.

[0007] In one possible implementation, the incremental encoder assembly further includes two bearings; an annular convex edge is provided on the inner side of the upper end of the support base, and the outer rings of the two bearings are respectively embedded in the inner side of the support base located above and below the annular convex edge and abut against the annular convex edge, and the rotating shaft passes through the inner rings of the two bearings; an annular expansion portion is provided on the outer wall of the lower end of the rotating shaft, and the upper end of the annular expansion portion abuts against the lower end of the inner ring of the lower bearing; a retaining ring is fitted on the outer wall of the rotating shaft, and the retaining ring abuts against the upper end of the inner ring of the upper bearing; through the arrangement of the two bearings, the rotating shaft can reliably and smoothly rotate with the support base, and under the abutment action of the outer rings of the two bearings above and below the annular convex edge, and under the cooperation action of the annular expansion portion and the retaining ring, the support base, the rotating shaft and the two bearings can achieve the purpose of axial positioning of each other.

[0008] In one possible implementation, an annular conical surface is provided at the inner edge of the upper end of the annular convex edge. The incremental encoder assembly also includes a sealing ring, which is coaxially sleeved on the rotating shaft and seals the rotating shaft circumferentially. The upper edge of the sealing ring is tightly sealed against the lower end of the inner ring in the bearing located above, and the lower edge of the sealing ring is tightly sealed against the annular conical surface. The inner side of the lower end of the housing is filled with sealant through the wire outlet hole. The sealant is used to seal the gap between the wire outlet hole and the connection wire of the control circuit board. With this structure, the sealing ring can prevent dust from entering the inner side of the support base through the gap between the rotating shaft and the support base, and the sealant can prevent dust from entering the inner side of the support base through the wire outlet hole on the housing. This can prevent dust from accumulating on the control circuit board and the Hall sensor, thereby ensuring the stability of the operation of the control circuit board and the Hall sensor.

[0009] In one possible implementation, the upper end of the housing is fitted onto the outside of the lower end of the support and threadedly fastened to the support. The housing and the support are circumferentially sealed by thread-locking adhesive filled between the housing and the support. With this structure, the housing can be reliably and conveniently connected to the lower end of the support. The thread-locking adhesive also prevents dust from entering the inside of the support through the gap between the housing and the support, thereby preventing dust accumulation on the control circuit board and the Hall sensor, and ensuring the stability of the operation of the control circuit board and the Hall sensor.

[0010] In one possible implementation, the industrial vehicle steering control device further includes a damping adjustment component; the damping adjustment component is fixed between the upper end of the incremental encoder assembly and the lower end face of the support plate, and the rotating shaft passes through the damping adjustment component. The damping adjustment component is used to adjust the rotational damping of the rotating shaft. By setting the damping adjustment component, the damping adjustment component can adjust the rotational damping of the rotating shaft, thereby adjusting the damping when the steering wheel drives the rotating shaft to rotate, that is, adjusting the steering feel of the steering wheel to a suitable state.

[0011] In one possible implementation, the damping adjustment assembly includes a connecting plate and a damping ring. The upper end of the connecting plate is fixed to the lower end face of the support plate by a plurality of first bolts arranged circumferentially at intervals. The upper end of the support base is fixed to the lower end of the connecting plate by a plurality of second bolts arranged circumferentially at intervals. The damping ring is coaxially sleeved on the rotating shaft. At least one adjustable pressurizing unit is provided on the connecting plate. The pressurizing unit is used to apply a compressive force to the damping ring to control the rotational damping of the rotating shaft. With this structure, the adjustable pressurizing unit can apply a varying compressive force to the damping ring, thereby changing the friction between the damping ring and the rotating shaft, and thus realizing the adjustment of the rotational damping of the rotating shaft, that is, the steering feel of the steering wheel can be adjusted to a suitable state.

[0012] In one possible implementation, a plurality of pressurizing units are provided, and the plurality of pressurizing units are distributed at intervals along the circumferential direction of the connecting plate; by providing a plurality of pressurizing units, the adjustable range of the damping force applied to the rotating shaft can be wider, and the adjustment of the damping force applied to the rotating shaft can be more precise.

[0013] In one possible implementation, the pressurizing unit includes a spring and an adjusting screw. A threaded hole corresponding to the pressurizing unit is radially provided on the side of the connecting plate. The spring and adjusting screw are installed sequentially from the inside out in the threaded hole, with the adjusting screw threadedly connected to the threaded hole. The two ends of the spring abut against the outer wall of the damping ring and the inner end of the adjusting screw, respectively. With this structure, when the adjusting screw is turned to move inwards towards the threaded hole and compress the spring, the spring force applied to the damping ring increases, thus increasing the rotational damping of the shaft. When the adjusting screw is turned to move outwards towards the threaded hole and gradually releases the compression of the spring, the spring force applied to the damping ring decreases, thus decreasing the rotational damping of the shaft. This pressurizing unit offers the advantage of convenient adjustment of the shaft's rotational damping, thereby allowing for easy adjustment of the steering wheel's steering feel.

[0014] In one possible implementation, the upper part of the pivot is provided with a connecting part with a "D" shaped cross-section, and the middle part of the steering wheel is provided with a through hole with a "D" shaped cross-section. The connecting part passes through the through hole and is circumferentially limited by the through hole. The upper end of the pivot is threaded with a nut. The lower end of the steering wheel abuts against the pivot located below the connecting part, and the upper part of the steering wheel abuts against the nut, so that the steering wheel and the pivot are axially limited. With this structure, the steering wheel can be reliably connected to the upper end of the pivot and reliably achieve the purpose of circumferential and axial limitation with the pivot. Attached Figure Description

[0015] Figure 1 This is a first three-dimensional structural schematic diagram of the present invention; Figure 2 This is a second three-dimensional structural schematic diagram of the present invention; Figure 3 This is a cross-sectional structural diagram of the present invention; Figure 4 for Figure 3 A magnified structural diagram of point A in the middle; Figure 5 This is a partial exploded three-dimensional structural diagram of the present invention; Figure 6 This is an exploded three-dimensional structural diagram of the second part of the present invention. Detailed Implementation

[0016] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0017] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0018] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0019] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] See Figures 1-6 As shown in the figure, this application discloses an industrial vehicle steering control device, including a support plate 1, a steering wheel 2, and an incremental encoder assembly 3. The support plate 1 is fixed to the frame of the industrial vehicle, the incremental encoder assembly 3 is fixed to the bottom of the support plate 1, the rotating shaft 31 of the incremental encoder assembly 3 moves from bottom to top through the support plate 1 and extends out of the support plate 1, the steering wheel 2 is coaxially fixed to the upper end of the rotating shaft 31, and the wiring harness of the incremental encoder assembly 3 is electrically connected to the controller inside the industrial vehicle. When the steering wheel 2 drives the rotating shaft 31 of the incremental encoder assembly 3 to rotate, the incremental encoder assembly 3 is used to transmit the electrical signal consisting of the steering direction and the steering angle to the controller.

[0021] The incremental encoder assembly 3 includes a support base 32, a control circuit board 33, and a housing 34. The upper end of the support base 32 is fixed to the bottom of the support plate 1. The lower end of the rotating shaft 31 passes through the support base 32 and is rotatably connected to it. A magnet 35 is coaxially embedded in the lower end of the rotating shaft 31. The control circuit board 33 is fixed to the inner side of the lower end of the support base 32. A Hall sensor 331 is mounted on the upper surface of the control circuit board 33. The magnet 35 and the Hall sensor 331 are vertically opposite to each other and have a clearance fit. The housing 34 is fixed to the lower end of the support base 32. A wire outlet hole 341 is provided at the bottom of the housing 34. The connecting wire of the control circuit board 33 is led out through the wire outlet hole 341 and electrically connected to the controller. When the steering wheel 2 drives the rotating shaft 31 to rotate, the magnet 35 triggers the Hall sensor 331, and the control circuit board 33 transmits the electrical signal composed of the steering direction and steering angle to the controller. By using this incremental encoder assembly, when the steering wheel drives the rotating shaft to rotate, the magnet can trigger the Hall sensor. Furthermore, the control circuit board can transmit the electrical signals consisting of the steering direction and steering angle to the controller. At this time, the controller can control the steering motor in the industrial vehicle to operate, that is, the steering motor can drive the traveling wheels to rotate in the corresponding direction and at the corresponding angle, thereby realizing the steering control of the industrial vehicle. The specific implementation process is as follows: when the steering wheel drives the shaft to rotate, the shaft can drive the magnet to rotate synchronously. At this time, the Hall sensor can sense the magnetic field change generated by the rotation of the magnet. The Hall sensor can convert the angle change corresponding to this magnetic field change into pulse square wave A and B signals. The phase difference between A and B signals is 90 degrees, and the A and B signals can be output to the controller through the amplification circuit module on the control circuit board, so that the controller controls the steering motor in the industrial vehicle to start rotating according to the signal. When the A signal is before the B signal, the steering motor rotates forward by the corresponding angle; when the B signal is before the A signal, the steering motor rotates backward by the corresponding angle, thus realizing the left and right steering function of the traveling wheels.

[0022] The incremental encoder assembly 3 also includes two bearings 36; an annular protrusion 321 is provided on the inner side of the upper end of the support base 32, and the outer rings of the two bearings 36 are respectively embedded in the inner side of the support base 32 located above and below the annular protrusion 321 and abut against the annular protrusion 321. The rotating shaft 31 passes through the inner rings of the two bearings 36; an annular expansion portion 311 is provided on the outer wall of the lower end of the rotating shaft 31, and the upper end of the annular expansion portion 311 abuts against the lower end of the inner ring of the lower bearing 36; a retaining spring 37 is fitted on the outer wall of the rotating shaft 31, and the retaining spring 37 abuts against the upper end of the inner ring of the upper bearing 36; through the arrangement of the two bearings, the rotating shaft can reliably and smoothly rotate with the support base, and under the abutment action of the outer rings of the two bearings above and below the annular protrusion, and under the cooperation action of the annular expansion portion and the retaining spring, the support base, the rotating shaft and the two bearings can achieve the purpose of axial positioning of each other.

[0023] An annular conical surface 322 is provided at the inner edge of the upper end of the annular protrusion 321. The incremental encoder assembly 3 also includes a sealing ring 38, which is coaxially sleeved on the rotating shaft 31 and seals the rotating shaft 31 circumferentially. The upper edge of the sealing ring 38 is tightly sealed to the lower end of the inner ring in the bearing 36 located above, and the lower edge of the sealing ring 38 is tightly sealed to the annular conical surface 322. The inner side of the lower end of the cover 34 is filled with sealant through the wire outlet hole 341. The sealant is used to seal the gap between the wire outlet hole 341 and the connection line of the control circuit board 33. With this structure, the sealing ring can prevent dust from entering the inner side of the support through the gap between the rotating shaft and the support, and the sealant can prevent dust from entering the inner side of the support through the wire outlet hole on the cover. This can prevent dust from accumulating on the control circuit board and the Hall sensor, thus ensuring the stability of the operation of the control circuit board and the Hall sensor.

[0024] The upper end of the cover 34 is fitted onto the outside of the lower end of the support 32 and is threadedly fastened to the support 32. The cover 34 and the support 32 are circumferentially sealed by thread-locking adhesive filled between the cover 34 and the support 32. With this structure, the cover can be reliably and conveniently connected to the lower end of the support. The thread-locking adhesive prevents dust from entering the inside of the support through the gap between the cover and the support, thereby preventing dust accumulation on the control circuit board and the Hall sensor, ensuring the stability of the operation of the control circuit board and the Hall sensor. In addition, when the cover and the support are threaded together, thread-locking adhesive is applied to the threaded part. After the thread-locking adhesive cures, the cover can be reliably fastened to the support.

[0025] The industrial vehicle steering control device also includes a damping adjustment component 4; the damping adjustment component 4 is fixed between the upper end of the incremental encoder component 3 and the lower end face of the support plate 1, and the rotating shaft 31 passes through the damping adjustment component 4. The damping adjustment component 4 is used to adjust the rotational damping of the rotating shaft 31. By setting the damping adjustment component, the damping adjustment component can adjust the rotational damping of the rotating shaft, thereby adjusting the damping when the steering wheel drives the rotating shaft to rotate, that is, the steering feel of the steering wheel can be adjusted to a suitable state.

[0026] The damping adjustment assembly 4 includes a connecting plate 41 and a damping ring 42. The upper end of the connecting plate 41 is fixed to the lower end face of the support plate 1 by a number of first bolts 5 distributed circumferentially. The upper end of the support base 32 is fixed to the lower end of the connecting plate 41 by a number of second bolts 6 distributed circumferentially. The damping ring 42 is coaxially sleeved on the rotating shaft 31. At least one adjustable pressure unit is provided on the connecting plate 41. The pressure unit is used to apply a compressive force to the damping ring 42 to control the rotational damping of the rotating shaft 31. With this structure, the adjustable pressure unit can apply a varying compressive force to the damping ring, thereby changing the friction between the damping ring and the rotating shaft, and thus realizing the adjustment of the rotational damping of the rotating shaft, that is, the steering feel of the steering wheel can be adjusted to a suitable state. The lower end of the damping ring abuts against the upper end of the retaining spring.

[0027] Several pressurizing units are provided, and the pressurizing units are distributed at intervals along the circumferential direction of the connecting plate 41. By setting multiple pressurizing units, the adjustable range of the damping force applied to the rotating shaft can be wider, and the adjustment of the damping force applied to the rotating shaft can be more delicate. In this embodiment, two pressurizing units are provided, and the two pressurizing units are set at 90-degree intervals along the circumferential direction of the connecting plate.

[0028] The pressurizing unit includes a spring 43 and an adjusting screw 44. A threaded hole 411 corresponding to the pressurizing unit is radially provided on the side of the connecting plate 41. The spring 43 and the adjusting screw 44 are installed sequentially from the inside to the outside within the threaded hole 411, and the adjusting screw 44 is threadedly connected to the threaded hole 411. The two ends of the spring 43 abut against the outer wall of the damping ring 42 and the inner end of the adjusting screw 44, respectively. With this structure, when the adjusting screw is turned to move inward toward the threaded hole and compress the spring, the spring force applied to the damping ring increases, thus increasing the rotational damping of the shaft. When the adjusting screw is turned to move outward toward the threaded hole and gradually release the compression of the spring, the spring force applied to the damping ring decreases, thus decreasing the rotational damping of the shaft. This pressurizing unit offers the advantage of convenient adjustment of the shaft's rotational damping, thereby facilitating the adjustment of the steering wheel's steering feel.

[0029] The upper part of the pivot 31 is provided with a connecting part 312 with a "D" shaped cross section, and the middle part of the steering wheel 2 is provided with a through hole 21 with a "D" shaped cross section. The connecting part 312 passes through the through hole 21 and is circumferentially limited by the through hole 21. The upper end of the pivot 31 is threaded with a nut 313. The lower end of the steering wheel 2 abuts against the pivot 31 located below the connecting part 312, and the upper part of the steering wheel 2 abuts against the nut 313, so that the steering wheel 2 and the pivot 31 are axially limited. With this structure, the steering wheel can be reliably connected to the upper end of the pivot and reliably achieve the purpose of circumferential and axial limitation with the pivot.

[0030] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A steering control device for industrial vehicles, characterized in that: The system includes a support plate (1), a steering wheel (2), and an incremental encoder assembly (3). The support plate (1) is fixed to the frame of the industrial vehicle. The incremental encoder assembly (3) is fixed to the bottom of the support plate (1). The rotating shaft (31) of the incremental encoder assembly (3) moves from bottom to top through the support plate (1) and extends out of the support plate (1). The steering wheel (2) is coaxially fixed with the upper end of the rotating shaft (31). The wiring harness of the incremental encoder assembly (3) is electrically connected to the controller inside the industrial vehicle. When the steering wheel (2) drives the rotating shaft (31) of the incremental encoder assembly (3) to rotate, the incremental encoder assembly (3) transmits the electrical signal consisting of the steering direction and the steering angle to the controller.

2. The industrial vehicle steering control device according to claim 1, characterized in that: The incremental encoder assembly (3) includes a support base (32), a control circuit board (33), and a housing (34); the upper end of the support base (32) is fixed to the bottom of the support plate (1), the lower end of the rotating shaft (31) passes through the support base (32) and is rotatably connected to the support base (32), a magnet (35) is coaxially embedded in the lower end of the rotating shaft (31), the control circuit board (33) is fixed to the inner side of the lower end of the support base (32), a Hall sensor (331) is mounted on the upper surface of the control circuit board (33), and the magnet (35) is fixed to the inner side of the lower end of the support base (32). 5) The cover (34) is vertically opposite to the Hall sensor (331) and gap-fitted. The cover (34) is fixed to the lower end of the support base (32). The bottom of the cover (34) is provided with a wire outlet hole (341). The connecting wire of the control circuit board (33) is led out through the wire outlet hole (341) and electrically connected to the controller. When the steering wheel (2) drives the rotating shaft (31) to rotate, the magnet (35) is used to trigger the Hall sensor (331), and the control circuit board (33) is used to transmit the electrical signal composed of the steering direction and steering angle to the controller.

3. The industrial vehicle steering control device according to claim 2, characterized in that: The incremental encoder assembly (3) also includes two bearings (36); an annular protrusion (321) is provided on the inner side of the upper end of the support base (32), and the outer rings of the two bearings (36) are respectively embedded in the inner side of the support base (32) located above and below the annular protrusion (321) and abut against the annular protrusion (321), and the rotating shaft (31) passes through the inner rings of the two bearings (36); an annular expansion portion (311) is provided on the outer wall of the lower end of the rotating shaft (31), and the upper end of the annular expansion portion (311) abuts against the lower end of the inner ring of the lower bearing (36); a retaining ring (37) is fitted on the outer wall of the rotating shaft (31), and the retaining ring (37) abuts against the upper end of the inner ring of the upper bearing (36).

4. The industrial vehicle steering control device according to claim 3, characterized in that: An annular conical surface (322) is provided at the inner edge of the upper end of the annular convex edge (321). The incremental encoder assembly (3) also includes a sealing ring (38). The sealing ring (38) is coaxially sleeved on the rotating shaft (31) and seals the rotating shaft (31) circumferentially. The upper edge of the sealing ring (38) is tightly sealed with the lower end of the inner ring in the bearing (36) located above. The lower edge of the sealing ring (38) is tightly sealed with the annular conical surface (322). The inner side of the lower end of the cover (34) is filled with sealant through the wire outlet hole (341). The sealant is used to seal the gap between the wire outlet hole (341) and the connection line of the control circuit board (33).

5. The industrial vehicle steering control device according to claim 4, characterized in that: The upper end of the cover (34) is sleeved on the outside of the lower end of the support (32) and threadedly fastened to the support (32). The cover (34) and the support (32) are circumferentially sealed by threaded adhesive filled between the cover (34) and the support (32).

6. The industrial vehicle steering control device according to any one of claims 2-5, characterized in that: The industrial vehicle steering control device also includes a damping adjustment component (4); the damping adjustment component (4) is fixed between the upper end of the incremental encoder component (3) and the lower end face of the support plate (1), the rotating shaft (31) passes through the damping adjustment component (4), and the damping adjustment component (4) is used to adjust the rotational damping of the rotating shaft (31).

7. The industrial vehicle steering control device according to claim 6, characterized in that: The damping adjustment assembly (4) includes a connecting plate (41) and a damping ring (42). The upper end of the connecting plate (41) is fixed to the lower end face of the support plate (1) by a number of first bolts (5) distributed circumferentially. The upper end of the support base (32) is fixed to the lower end of the connecting plate (41) by a number of second bolts (6) distributed circumferentially. The damping ring (42) is coaxially sleeved on the rotating shaft (31). At least one adjustable pressurizing unit is provided on the connecting plate (41). The pressurizing unit is used to apply extrusion force to the damping ring (42) to control the rotation damping of the rotating shaft (31).

8. The industrial vehicle steering control device according to claim 7, characterized in that: The pressurizing unit is provided in several parts, and the pressurizing units are distributed at intervals along the circumferential direction of the connecting plate (41).

9. The industrial vehicle steering control device according to claim 7 or 8, characterized in that: The pressurizing unit includes a spring (43) and an adjusting screw (44); the side of the connecting plate (41) is radially provided with a threaded hole (411) corresponding to the pressurizing unit. The spring (43) and the adjusting screw (44) are installed in the threaded hole (411) from the inside to the outside, and the adjusting screw (44) is threadedly connected to the threaded hole (411). The two ends of the spring (43) abut against the outer wall of the damping ring (42) and the inner end of the adjusting screw (44), respectively.

10. The industrial vehicle steering control device according to any one of claims 1-5 or 7-8, characterized in that: The upper part of the rotating shaft (31) is provided with a connecting part (312) with a "D" shaped cross section. The middle part of the steering wheel (2) is provided with a through hole (21) with a "D" shaped cross section. The connecting part (312) passes through the through hole (21) and is circumferentially limited by the through hole (21). The upper end of the rotating shaft (31) is threaded with a nut (313). The lower end of the steering wheel (2) abuts against the rotating shaft (31) located below the connecting part (312). The upper part of the steering wheel (2) abuts against the nut (313) so that the steering wheel (2) and the rotating shaft (31) are axially limited.

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