A variable-diameter cable transmission mechanism and control method thereof

Abstract

The present invention belongs to the technical field of cable traction transmission, and discloses a variable-diameter cable transmission mechanism and a control method thereof. The traction mechanism includes a transmission device, a hydraulic power device and a control device. The transmission device includes a pair of left-right symmetrical conveyor belt traction mechanisms. The conveyor belts of the two conveyor belt traction mechanisms are arranged oppositely, and there is a gap between the two for transmitting cables; an annular groove is opened on the circumference of the outer surface of the conveyor belt, and the annular groove is used to wrap cables to be transmitted with different radii; a clamping module is also arranged on the inner side of each conveyor belt, and the clamping modules arranged oppositely cooperate to squeeze the corresponding conveyor belt to reduce the spacing of the gap and press the cable to be transmitted into the grooves on both sides thereof. When the transmission mechanism of the present invention transmits the cable, the clamping module can squeeze the conveyor belt under the drive of the hydraulic power device, so that the groove on it can wrap the cable to avoid cable friction damage.

Description

Technical Field

[0001] The present invention belongs to the technical field of cable traction transmission, and more specifically, relates to a variable-diameter cable transmission mechanism and a control method thereof. Background Art

[0002] Cables generally have the characteristics of small radius, long length and high flexibility, and are widely used in the production and use of power, communication, petroleum, aerospace, marine information detection, military industry and other fields. In the production process of cables, it is necessary to continuously transmit cables. In the laying process of communication cables, it is also necessary to transport and pull cables. In the construction process of bridges and other facilities, it is necessary to pull steel wire ropes. In these processes, cable transmission mechanisms are used.

[0003] The widely used cable transmission mechanism is generally only suitable for the transmission of cables with the same radius size. For special products, there are variable diameter cables, and these special cables must also ensure the service life under high transmission force, which puts very strict requirements on the cable transmission mechanism. The existing cable transmission mechanism cannot meet the above requirements. There is an urgent need for a traction mechanism that can meet the transmission needs of variable diameter cables and achieve greater traction force and less cable damage. Summary of the invention

[0004] In view of the defects of the prior art, the purpose of the present invention is to provide a solution to the above technical problems. The present invention provides a variable diameter cable transmission mechanism and a control method thereof, which can realize cable transmission of different radii, and has the advantages of simple and compact structure, large traction force, little damage to the cable, and simple control.

[0005] To achieve the above-mentioned purpose, the present invention provides a variable-diameter cable transmission mechanism, which includes a transmission device, a hydraulic power device and a control device. The transmission device includes a pair of left-right symmetrical conveyor belt traction mechanisms, the conveyor belts of the two conveyor belt traction mechanisms are arranged opposite to each other, and there is a gap between the two for transmitting cables; an annular groove is opened on the circumference of the outer surface of the conveyor belt, and the annular groove is used to cover cables to be transmitted with different radii; a compression module is also arranged on the inner side of each conveyor belt, and the two oppositely arranged compression modules cooperate to squeeze the corresponding conveyor belt to reduce the spacing of the gap and press the cables to be transmitted into the grooves on both sides thereof;

[0006] During operation, the control device controls the hydraulic power device to drive the two clamping modules to positively extrude the corresponding conveyor belts, compressing the cables to be transmitted into the grooves, and then controls the two conveyor belt traction mechanisms to rotate in opposite directions, so as to generate friction between the cables and the conveyor belts to realize cable transmission. During the transmission process, the clamping module can slide on the inside of the corresponding conveyor belt.

[0007] Furthermore, the groove includes a first arc groove and a second arc groove, the radius of the first arc groove is larger than that of the second arc groove, and the second arc groove is opened on the bottom surface of the first arc groove, and the line connecting the centers of the two grooves is perpendicular to the outer surface of the conveyor belt.

[0008] Furthermore, the distance between the centers of the first arc groove and the second arc groove is a preset distance, and the preset distance is preferably 7 mm.

[0009] Furthermore, the ratio of the radius of the first arc groove to the radius of the second arc groove is 8:3-12:7.

[0010] Furthermore, the center of the first circular arc groove is located above the outer surface of the conveyor belt where it is located, and the straight-line distance from the outer surface of the conveyor belt where it is located is the radius of the first circular arc groove. arrive

[0011] Furthermore, the straight-line distance between the bottom of the groove and the inner surface of the conveyor belt is arrive Preferably, the thickness of the conveyor belt is 12mm-15mm, and the width is preferably 30mm-40mm.

[0012] Furthermore, the hydraulic power device includes an accumulator, a hydraulic cylinder and a pump, the accumulator outlet is connected to the input end of the pump, and a one-way valve is arranged between the two; the output end of the pump is connected to the hydraulic cylinder, and a reversing valve is arranged between the two, and the reversing valve, the accumulator, the hydraulic cylinder and the pump form a hydraulic circuit; the output shaft of the hydraulic cylinder is connected to the clamping module; preferably, the reversing valve is a three-position reversing valve.

[0013] Furthermore, a pressure sensor is provided between the hydraulic power device and the control device, and the pressure sensor is used to receive a pressure signal in the hydraulic circuit and feed the pressure signal back to the control device to control the opening and closing of the hydraulic power device.

[0014] Furthermore, the conveyor belt traction mechanism also includes a driving wheel and a driven wheel, the driving wheel and the driven wheel tension the conveyor belt, the driving wheel is also connected to a power mechanism, and the control device can control the power mechanism to drive the driving wheel to rotate, so as to rotate the conveyor belt through the friction and tension force between the driving wheel and the conveyor belt, thereby driving the driven wheel to rotate.

[0015] According to another aspect of the present invention, a control method for a variable-diameter cable transmission mechanism is also provided. The method can be implemented on any of the above-mentioned variable-diameter cable transmission mechanisms. The control method comprises the following steps:

[0016] S1. The control device determines whether the hydraulic power device meets the preset pressurization condition. If not, the control device controls the hydraulic power device to charge until the preset pressurization condition is met, and then controls the hydraulic power device to pressurize to drive the pressing module to positively press the corresponding conveyor belt until the cable to be transmitted is pressed into the groove on the conveyor belt; if the condition is met, the control device directly controls the hydraulic power device to pressurize to press the cable to be transmitted into the groove;

[0017] S2. After the pressurization is completed, the control device controls the two conveyor belt traction mechanisms to rotate in opposite directions respectively, so that friction is generated between the cable and the conveyor belt to realize cable transmission;

[0018] S3. After the conveying is completed, the control device controls the hydraulic power device to release pressure so that the clamping module no longer applies friction positive pressure to the conveyor belt.

[0019] Further, in step S1, the control device determines whether the current hydraulic circuit pressure is less than the preset pressure based on the pressure signal fed back by the pressure sensor in real time: if so, the pump is controlled to charge the accumulator until the real-time pressure reaches the preset pressure, and then the pump is controlled to be turned off, and then the clamping module is pressurized; if not, step S2 is directly executed;

[0020] Preferably, in step S1, when the radius of the cable to be transmitted changes, the friction positive pressure applied by the compression module to the corresponding conveyor belt remains unchanged;

[0021] Preferably, the step of pressurizing in step S1 includes: the control device controls the reversing valve to switch from the middle position to the pressurizing position to pressurize, so that the hydraulic energy in the hydraulic circuit enters the input end of the hydraulic cylinder to push the output shaft of the hydraulic cylinder to extend from its output end, so as to drive the clamping module to clamp the cable to be transmitted;

[0022] Preferably, the pressure relief step in step S3 includes: the control device controls the reversing valve to be switched to the pressure relief position, so that all the hydraulic energy in the hydraulic cylinder flows back, so that the clamping module no longer applies friction positive pressure to the conveyor belt.

[0023] The above technical solution conceived by the present invention has the following advantages compared with the prior art:

[0024] 1. The variable-diameter cable transmission mechanism provided by the present invention includes a transmission device, a hydraulic power device and a control device. The transmission device includes a conveyor belt traction mechanism that is symmetrically arranged on the left and right. A tensioned annular conveyor belt is arranged on the outside of the conveyor belt traction mechanism, and a clamping module is arranged on the inside. A groove is opened on the circumference of the outer surface of the conveyor belt. Cables of different radii to be transmitted can be arranged in the groove between the contact surfaces of the two conveyor belts, and the cables are wrapped with conveyor belts to reduce damage to the cables; the clamping module can apply friction positive pressure to the conveyor belt under the drive of the hydraulic power device to press the cables to be transmitted into the groove. After clamping, the two conveyor belts can rotate in opposite directions, and the side of the clamping module in contact with the conveyor belt can slide on the conveyor belt, thereby avoiding hindering the rotation of the conveyor belt, so as to realize the transmission of the cable.

[0025] 2. The variable-diameter cable transmission mechanism provided by the present invention is provided with a clamping module on the inner side of the conveyor belt traction mechanism, and the clamping module can apply positive pressure to the conveyor belt under the drive of the hydraulic power device to press the cable into the groove on the conveyor belt, and the clamping modules symmetrically arranged on both sides can apply the same friction positive pressure to the conveyor belt through the clamping pressure preset in the control device, thereby generating the same friction positive pressure on the cable, further reducing damage to the cable.

[0026] 3. The hydraulic power device of the variable diameter cable transmission mechanism provided by the present invention includes an accumulator, a hydraulic cylinder and a pump. The outlet of the accumulator is connected to the input end of the pump, and a one-way valve is arranged between the two. The output end of the pump is connected to the hydraulic cylinder, and a reversing valve is arranged between the two. The output shaft of the hydraulic cylinder is connected to the clamping module. Since the reversing valve is a three-position reversing valve, it can realize oil delivery and oil return. Therefore, the reversing valve, accumulator, hydraulic cylinder and pump form a hydraulic circuit, and a pressure sensor is arranged on the hydraulic circuit to feed back the pressure of the hydraulic circuit to the controller, thereby realizing closed-loop control, and there is no need to turn on the pump for a long time, thereby further reducing noise pollution.

[0027] 4. The variable-diameter cable transmission mechanism provided by the present invention comprises a groove on a conveyor belt consisting of a first arc groove and a second arc groove, wherein the second arc groove is provided on the bottom surface of the first arc groove, and the line connecting the centers of the two grooves is perpendicular to the surface of the conveyor belt; and the center distance between the first arc groove and the second arc groove is a preset distance, and the ratio of the radius of the first arc groove to the radius of the second arc groove is 8:3-12:7; the center of the first arc groove is located outside the surface of the conveyor belt where it is located, and the straight-line distance from the outer surface of the conveyor belt where it is located is 1 / 4 of the radius of the first arc groove. arrive The straight-line distance between the bottom of the second arc groove and the inner surface of the conveyor belt is the thickness of the conveyor belt. arrive The thickness of the conveyor belt is preferably 12mm-15mm. Thus, cables of different radii can be confined in the belt grooves, and a gap is left between two symmetrical grooves when cables are installed, so that the cables can be better placed in the grooves, covered by the cables, and closely fit with the conveyor belt under the action of the clamping device, so that friction can be generated when the conveyor belt rotates to realize cable transmission.

[0028] 5. The control method of the variable diameter cable transmission mechanism provided by the present invention, first, the pressure sensor receives the real-time pressure signal in the hydraulic circuit and transmits it to the controller. If the real-time pressure is less than the preset pressure, the controller starts the pump to charge the accumulator until the pressure of the hydraulic circuit reaches the preset pressure and automatically shuts down the pump. If the preset pressure is not reached, the pressure is directly increased. Due to the action of the one-way valve, the hydraulic energy in the accumulator will not flow out and release the pressure. The controller controls the reversing valve to transmit the switch signal, so that the reversing valve is switched to the pressurized position, so that the hydraulic energy enters the input end of the hydraulic cylinder, thereby pushing the output shaft of the hydraulic cylinder to extend from its output end, so as to push the two clamping modules closer to each other, thereby clamping the cable between the two conveyor belts. Under the action of the one-way valve, the hydraulic pressure in the accumulator can remain stable for a certain period of time, so the clamping force of the clamping module on the cable can be maintained constant, and even if the cable size changes, the clamping force on the cable remains unchanged. When transmitting the cable, the controller controls the motor to start to drive the driving wheel of the belt to rotate. Since the driving wheel and the driven wheel tighten the conveyor belt, the friction between the driving wheel and the conveyor belt drives the conveyor belt to move, and then the cable transmission is achieved through the friction between the cable and the conveyor belt. When the pressure is relieved after the transmission is completed, the controller transmits a switch signal to the reversing valve to make the reversing valve switch to the middle position, and the hydraulic energy in the hydraulic cylinder is completely returned to the oil tank. The output shaft of the hydraulic cylinder is then in a depressurized state. The clamping module can be completely disengaged from the conveyor belt at this time and no longer applies pressure to the conveyor belt. Therefore, the conveyor belt does not generate friction on the cable under unloading conditions, further reducing damage to the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the variable diameter cable transmission mechanism of the present invention;

[0030] Figure 2 It is a schematic longitudinal section diagram of a conveyor belt of a variable diameter cable conveying mechanism of the present invention.

[0031] In the figure: 1-transmission device, 1-1-conveyor belt, 1-2-clamping module, 1-3-hydraulic cylinder, 1-4-driving wheel; 2-hydraulic power unit, 2-1-accumulator, 2-2-reversing valve, 2-3-pressure sensor, 2-4-check valve, 2-5-pump, 2-6-safety valve; 3-control device; 4-cable; 5-power mechanism. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] Example 1

[0034] like Figure 1 As shown, the present invention provides a variable-diameter cable transmission mechanism, the traction mechanism includes a transmission device 1, a hydraulic power device 2 and a control device 3, the transmission device 1 includes a pair of left-right symmetrical conveyor belt traction mechanisms, the conveyor belt traction mechanism is provided with a tensioned annular conveyor belt 1-1, the two conveyor belts are arranged opposite to each other, and there is a gap between the two for transmitting cables; an annular groove is opened on the circumference of the outer surface of the conveyor belt 1-1, and the size of the annular groove can cover cables of different radii; a clamping module 1-2 is also arranged on the inner side of the conveyor belt, and the two clamping modules arranged opposite to each other cooperate to squeeze the corresponding conveyor belts to reduce the gap spacing between the conveyor belts, and press the cable 4 to be transmitted into the grooves on both sides thereof, and after the two conveyor belts cover the cable, there is still a gap between the conveyor belts.

[0035] When working, the control device 3 controls the hydraulic power device 2 to drive the two clamping modules to positively squeeze the corresponding conveyor belts, compress the cables to be transmitted into the grooves, and then control the two conveyor belt traction mechanisms to rotate in opposite directions, so that friction is generated between the cables and the conveyor belts to achieve cable transmission. When the conveyor belts rotate inward, the conveyor belts transmit downward, and when the conveyor belts rotate outward, the conveyor belts transmit upward. During the transmission process, the clamping module can slide on the inside of the corresponding conveyor belts to ensure that it does not hinder the rotation of the conveyor belts. The aforementioned annular grooves wrap and fix the cables, and wrapping the outside of the cables with belts can reduce the wear of the cables during transmission and avoid transportation damage to the cables.

[0036] As a preferred embodiment, Figure 2 As shown, in the longitudinal cross-sectional direction of the conveyor belt, the aforementioned annular groove includes a first arc groove and a second arc groove, the radius of the first arc groove is greater than that of the second arc groove, and the second arc groove is opened on the bottom surface of the first arc groove, and the line connecting the centers of the two grooves is perpendicular to the surface of the conveyor belt, so that the arc groove of each radius can correspond to a cable of a certain radius, so that the traction mechanism of the present invention can transmit cables of different radii.

[0037] As a preferred embodiment, the distance between the centers of the first arc groove and the second arc groove is a preset distance L, and the preset distance L can be set according to the actual radius of the cable to be transmitted, and a conveyor belt with corresponding grooves can be manufactured. Compared with straight belt transmission cables and conveyor belts with grooves, it has high flexibility and can further reduce the damage of cables of different radii during transmission.

[0038] As a preferred embodiment, the radius ratio of the first arc groove R to the second arc groove r is 8:3-12:7, which can meet the sheathing requirements of most cables with different radii.

[0039] As a preferred embodiment, the straight-line distance l between the center of the first arc groove and the conveyor belt surface where it is located is equal to the radius of the first arc groove. If the center of the first arc groove is on the outer surface of the conveyor belt, the depth of the arc groove is the radius of the arc groove. If the transmission radius of the cable is greater than the radius of the arc groove, it cannot be well covered by the conveyor belt, that is, it is difficult for the cable to be completely embedded in the arc groove. If the depth of the arc groove is greater than its radius, cables with larger diameters are more difficult to cover. On the contrary, if the depth of the first arc groove is shallower than its radius, cables with smaller diameters are easy to loosen in the groove, and wear will still occur during transmission.

[0040] As a preferred embodiment, the straight-line distance h between the bottom of the groove and the inner surface of the conveyor belt is 1 / 2 of the thickness of the conveyor belt. Preferably, the thickness H of the conveyor belt is 12mm-15mm, the width A is 30mm-40mm, and the straight-line distance h between the bottom of the groove and the inner surface of the conveyor belt is 4mm-6mm, which can ensure the strength performance of the conveyor belt after tensioning.

[0041] As a preferred embodiment, the hydraulic power device 2 includes an accumulator 2-1, a hydraulic cylinder 1-3 and a pump 2-5. The outlet of the accumulator 2-1 is connected to the input end of the pump 2-5, and a one-way valve 2-4 is arranged between the two; the output end of the pump 2-5 is connected to the hydraulic cylinder 1-3, and a reversing valve 2-2 is arranged between the two. The reversing valve 2-2, the accumulator 2-1, the hydraulic cylinder 1-3 and the pump 2-5 form a hydraulic circuit, and the hydraulic circuit is also connected to an oil tank (not shown in the figure) for receiving the hydraulic energy refluxed from the hydraulic cylinder 1-3; the output shaft of the hydraulic cylinder 1-3 is connected to the clamping module; preferably, the reversing valve 2-2 is a three-position reversing valve, including a pressurizing position, a middle position and a pressure relief position, so that the traction mechanism of the present invention has three working modes, namely a pressurizing working mode, a transmission working mode and a pressure relief working mode.

[0042] As a more preferred embodiment, a pressure sensor 2-3 is further provided between the hydraulic power unit 2 and the control device 3. The pressure sensor 2-3 is used to receive the pressure signal in the hydraulic circuit and feed the pressure signal back to the control device 3 to control the opening and closing of the hydraulic power unit 2. The closed-loop control is displayed through the signal feedback of the pressure sensor 2-3, so that the traction mechanism of the present invention does not need to turn on the pump for a long time, further saving energy and reducing noise pollution.

[0043] As a preferred embodiment, the conveyor belt traction mechanism also includes a driving wheel 1-4 and a driven wheel. The driving wheel 1-4 and the driven wheel are vertically coaxially arranged to tension the conveyor belt. The driving wheels 1-4 are also respectively connected to a power mechanism 5. The control device 3 can control the power mechanism 5 to drive the two driving wheels to rotate, so that the conveyor belt rotates through the friction and tension force between the driving wheel and the conveyor belt, thereby driving the driven wheel to rotate.

[0044] Example 2

[0045] Another variable-diameter cable transmission mechanism is disclosed, wherein the traction mechanism includes: Figure 1 The conveying device 1, hydraulic power device 2 and control device 3 shown in the figure, the conveying device 1 includes a pair of conveyor belt traction mechanisms arranged on the frame, and the belt conveying mechanism is provided with a tensioned annular conveyor belt 1-1, which is a belt, and the outer surfaces of the two belts are arranged oppositely, and there is a gap between the two for transmitting cables; an annular groove is also provided on the outer surface of the belt, and the groove includes a first arc groove and a second arc groove, the radius of the first arc groove is greater than the second arc groove, and the second arc groove is provided on the bottom surface of the first arc groove, and the center line of the two grooves is perpendicular to the outer surface of the conveyor belt. The annular groove is used to cover cables of different radii; a clamping module 1-2 is also provided on the inner side of the conveyor belt, and the clamping module is provided with multiple groups, and the clamping module is a clamping wheel group, and the side contacting the conveyor belt has multiple rollers. The two clamping modules arranged oppositely cooperate to squeeze the corresponding conveyor belt to reduce the gap between the conveyor belts, and compress the cables to be transmitted into the grooves on both sides thereof.

[0046] During operation, the control device 3 controls the hydraulic power device 2 to drive the two clamping modules to positively squeeze the corresponding belts according to the same preset clamping force until the cable to be transmitted is pressed into the groove, and then controls the two conveyor belt traction mechanisms to rotate in opposite directions respectively, so that friction is generated between the cable and the conveyor belt to realize cable transmission. When the conveyor belt rotates inward, the conveyor belt transmits downward, and when the conveyor belt rotates outward, the conveyor belt transmits upward. During the transmission process, the rollers of the clamping wheel group can slide on the inside of the corresponding conveyor belt to ensure that they do not generate resistance to the rotation of the belt. The aforementioned annular groove wraps and fixes the cable, and wrapping the outside of the cable with a belt can reduce the wear of the cable during transmission and avoid transportation damage to the cable.

[0047] In this embodiment, the distance L between the center of the first arc groove and the second arc groove is preferably 7mm, the radius R of the first arc groove is 8mm-12mm, preferably 10mm; the radius r of the second arc groove is 3mm-7mm, preferably 5mm; the straight-line distance l between the center of the first arc groove and the outer surface of the conveyor belt where it is located is 3mm-5mm, preferably 4mm in this embodiment; the straight-line distance h between the bottom of the groove and the inner surface of the conveyor belt is 4mm-6mm, preferably 5mm in this embodiment; the thickness H of the conveyor belt in this embodiment is 12mm-15mm, the more preferred thickness is 13mm, and the width A is preferably 40mm. The aforementioned vertical design can ensure that the groove on the belt can better cover the cable, protecting it from friction damage, while also making the belt stronger and having a longer service life.

[0048] The structure of the hydraulic power device 2 is the same as that of Example 1, and the aforementioned belt transmission mechanism also includes a driving wheel and a driven wheel, which tension the conveyor belt. The power mechanism connected to the power shaft of the driving wheel is a motor. The control device 3 can control the motor to drive the driving wheel to rotate, so as to rotate the conveyor belt through the friction and tension between the driving wheel and the conveyor belt, thereby driving the driven wheel to rotate.

[0049] Example 3

[0050] A control method for a variable-diameter cable transmission mechanism is also provided. The method can be implemented on any of the above variable-diameter cable transmission mechanisms. The steps of the control method are:

[0051] S1. Determine the current real-time pressure of the hydraulic circuit: The control device 3 determines whether the current hydraulic circuit pressure is less than a preset pressure based on the pressure signal fed back in real time by the pressure sensor 2-3. The preset pressure can be pre-calculated and set in the controller:

[0052] If so, the control pump 2-5 charges the accumulator 2-1 until the real-time pressure measured by the pressure sensor 2-3 reaches the preset pressure, and then the control pump 2-5 is turned off, and then the pressing module is pressurized;

[0053] If not, directly pressurize the compression module;

[0054] S2, pressurization working mode: the control device 3 controls the reversing valve 2-2 to switch from the middle position to the pressurization position for pressurization, so that the hydraulic energy in the hydraulic circuit enters the input end of the hydraulic cylinder 1-3 to push the output shaft (or piston) of the hydraulic cylinder 1-3 out of its output end to drive the clamping module 1-2 to clamp the cable to be transmitted. When the diameter of the cable to be transmitted changes, the clamping force of the clamping module 1-2 on the corresponding conveyor belt remains unchanged. Because the hydraulic pressure in the accumulator 2-1 can remain stable for a certain period of time, the clamping force of the two clamping modules 1-2 on the cable 4 to be transmitted between them can be maintained constant, and even if the cable size changes, the clamping force on the cable remains unchanged;

[0055] S3, conveying working mode: the control device 3 controls the power mechanism to drive the two conveyor belt traction mechanisms to rotate in opposite directions (rotate inward or rotate outward) so as to generate friction between the cable and the conveyor belt to achieve cable release or recovery;

[0056] S4, pressure relief working mode: When the transmission is completed and the traction mechanism is no longer needed to transmit the cable, the cable can be completely released. The controller 3 first controls the hydraulic energy to enter the front of the hydraulic cylinder 1-3 to push the output shaft (or piston) to move backward, thereby driving the clamping module to move away from the cable until the clamping module is completely separated from the conveyor belt. After that, the control device controls the reversing valve to switch to the pressure relief position, so that all the hydraulic energy flows back to the oil tank, so that the clamping module no longer applies friction positive pressure to the conveyor belt.

[0057] The aforementioned control device (3) is a commonly used controller of various types that can realize control functions and can carry control programs, and this type of controller can realize various data processing functions such as data calculation, data processing and data analysis.

[0058] The present invention is used for pulling cables of different diameters, and the sheath of the cable will not be damaged or destroyed during the pulling process. The control device controls the hydraulic power device to transmit the cable, which can further prevent the cable from being deformed due to uneven force during the pulling process.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A variable diameter cable transmission mechanism, characterized in that: The mechanism comprises a conveying device (1), a hydraulic power device (2) and a control device (3), wherein the conveying device (1) comprises a pair of conveyor belt traction mechanisms which are symmetrical on both sides, wherein the conveyor belts of the two conveyor belt traction mechanisms are arranged opposite to each other, and there is a gap between the two for transmitting cables; an annular groove is provided on the circumferential direction of the outer surface of the conveyor belt, wherein the annular groove is used to cover cables of different radii, wherein the annular groove comprises a first arc groove and a second arc groove, wherein the second arc groove is provided on the bottom surface of the first arc groove, and the straight-line distance between the bottom of the second arc groove and the inner surface of the conveyor belt is one times the thickness of the conveyor belt. ; The line connecting the centers of the first arc groove and the second arc groove is perpendicular to the outer surface of the conveyor belt, and the distance between the centers is 7 mm; the ratio of the radius of the first arc groove to the radius of the second arc groove is 8:3-12:7; the center of the first arc groove is located above the outer surface of the conveyor belt where it is located, and the straight-line distance from the outer surface of the conveyor belt where it is located is 1 / 2 of the radius of the first arc groove. Each of the conveyor belts is also provided with a compression module on the inner side, and two oppositely arranged compression modules cooperate to squeeze the corresponding conveyor belt to reduce the spacing of the gap and compress the cable to be transmitted into the grooves on both sides thereof; When working, the control device (3) controls the hydraulic power device (2) to drive the two clamping modules to positively squeeze the corresponding conveyor belts, thereby clamping the cables to be transmitted into the grooves, and then controls the two conveyor belt traction mechanisms to rotate in opposite directions, so that friction is generated between the cables and the conveyor belts to realize cable transmission. During the transmission process, the clamping modules can slide on the inside of the corresponding conveyor belts.

2. A variable diameter cable transmission mechanism as claimed in claim 1, characterized in that: The thickness of the conveyor belt is 12mm-15mm; and the width is 30mm-40mm.

3. A variable diameter cable transmission mechanism as claimed in claim 1, characterized in that: The hydraulic power device (2) comprises an accumulator (2-1), a hydraulic cylinder (1-3) and a pump (2-5); the outlet of the accumulator (2-1) is connected to the input end of the pump (2-5), and a one-way valve (2-4) is arranged between the two; the output end of the pump (2-5) is connected to the hydraulic cylinder (1-3), and a reversing valve (2-2) is arranged between the two; the reversing valve (2-2), the accumulator (2-1), the hydraulic cylinder (1-3) and the pump (2-5) form a hydraulic circuit; and the output shaft of the hydraulic cylinder (1-3) is connected to the clamping module.

4. A variable diameter cable transmission mechanism as claimed in claim 3, characterized in that: The reversing valve (2-2) is a three-position reversing valve.

5. A variable diameter cable transmission mechanism as claimed in claim 3, characterized in that: A pressure sensor (2-3) is also provided between the hydraulic power device (2) and the control device (3), and the pressure sensor (2-3) is used to receive a pressure signal in the hydraulic circuit and feed the pressure signal back to the control device (3) to control the opening and closing of the hydraulic power device (2).

6. A variable diameter cable transmission mechanism as claimed in claim 1, characterized in that: The conveyor belt traction mechanism also includes a driving wheel and a driven wheel for tensioning the conveyor belt. The driving wheel is also connected to a power mechanism. The control device (3) can control the power mechanism to drive the driving wheel to rotate, so as to rotate the conveyor belt through the friction force and tension force between the driving wheel and the conveyor belt, thereby driving the driven wheel to rotate.

7. A control method for a variable-diameter cable transmission mechanism, characterized in that: The method can be implemented on a variable-diameter cable transmission mechanism as described in any one of claims 1 to 6, and the control method comprises the following steps: S1, the control device (3) determines whether the hydraulic power device (2) satisfies a preset pressurization condition; if not, the control device (3) controls the hydraulic power device (2) to charge until the preset pressurization condition is met, and then controls the hydraulic power device (2) to pressurize, so as to drive the pressing module to positively press the corresponding conveyor belt until the cable to be transmitted is pressed into the groove on the conveyor belt; if the condition is met, the control device (3) directly controls the hydraulic power device (2) to pressurize, so as to press the cable to be transmitted into the groove; S2, after the pressurization is completed, the control device (3) controls the two conveyor belt traction mechanisms to rotate in opposite directions respectively, so that friction is generated between the cable and the conveyor belt to realize cable transmission; S3. After the conveying is completed, the control device (3) controls the hydraulic power device (2) to release pressure, so that the clamping module no longer applies friction positive pressure to the conveyor belt.

8. A control method for a variable-diameter cable transmission mechanism as claimed in claim 7, characterized in that: In step S1, the control device (3) determines whether the current hydraulic circuit pressure is less than the preset pressure based on the pressure signal fed back in real time by the pressure sensor (2-3); if so, the pump (2-5) is controlled to charge the accumulator (2-1) until the real-time pressure reaches the preset pressure, and then the pump (2-5) is controlled to be turned off, and then the clamping module is pressurized; if not, step S2 is directly executed.

9. A control method for a variable-diameter cable transmission mechanism as claimed in claim 7, characterized in that: In step S1, when the radius of the cable to be transmitted changes, the friction positive pressure applied by the clamping module to the corresponding conveyor belt remains unchanged.

10. A control method for a variable-diameter cable transmission mechanism according to claim 9, characterized in that: The step of pressurizing in step S1 includes: the control device (3) controls the reversing valve (2-2) to switch from the middle position to the pressurizing position for pressurizing, so that the hydraulic energy in the hydraulic circuit enters the input end of the hydraulic cylinder (1-3) to push the output shaft of the hydraulic cylinder (1-3) to extend from its output end, so as to drive the clamping module (1-2) to clamp the cable to be transmitted.

11. A control method for a variable diameter cable transmission mechanism according to claim 7, characterized in that: The pressure relief step in step S3 includes: the control device (3) controls the reversing valve (2-2) to return to the middle position to relieve pressure, so that all the hydraulic energy in the hydraulic cylinder (1-3) flows back, so that the clamping module no longer applies friction positive pressure to the conveyor belt.

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