Vehicle equipped with back-forth pull winch

Abstract

To provide a vehicle equipped with a back-forth pull winch, which enables a user involved in winch operation to accurately grasp a surplus traction force corresponding to an extending direction during the operation.SOLUTION: A vehicle 1 having a capstan winch 10 provided in a vehicle rear part and a wire rope 20 wound on the capstan winch 10 by a prescribed times and disposed at the tip on a vehicle front 1A via a folding member 50 of a vehicle rear surface 1B comprises: an actuator 70 used for operating the capstan winch 10; an extension direction detector 60 used for detecting which of forth-pulling and back-pulling is being carried out; a tensile force measuring instrument used for measuring a tensile force generated in the wire rope 20; and deriving means 91 for deriving a residual force as a surplus force up to a maximum tensile force of the wire rope 20 corresponding to the extension direction on the basis of the detection result of the extension direction detector 60 and the measurement result of the tensile force measuring instrument. The residual force is displayed on a display unit 71 of the actuator 70.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a vehicle such as a rescue work vehicle equipped with a winch for forward and backward pulling.

Background Art

[0002] Rescue work vehicles used at disaster sites, fire sites, etc. are often equipped with a winch for towing in addition to a crane and lighting equipment. The operation of the winch, such as the operation of paying out and winding up the wire rope, can be performed using a wireless or wired remote control or the like. Here, Patent Document 1 discloses a winch device including a wire, a drum around which the wire is wound, a motor that rotationally drives the drum, a winding layer number detection means for detecting the number of winding layers of the wire wound around the drum, and an output control means for controlling the output of the motor based on the detection result of the winding layer number detection means. Further, Patent Document 2 discloses an aircraft winch control device having a control unit for controlling an electric motor, the control unit having a plurality of control modes related to the control of the winding and / or paying out operation of a towing member, and changing the control mode when the difference between the amount of the towing member paid out detected by a pay-out amount detection unit and the altitude of the aircraft detected by an altitude detection unit reaches a predetermined threshold value. In paragraph 0033, it is described that winch data is displayed on the liquid crystal monitor of the operation unit.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] In addition to the drum type as shown in Patent Document 1, there is also a type called a capstan winch for winches. In a drum winch, the maximum traction force varies depending on the amount of wire rope extension (the number of winding layers on the winding drum), but in a capstan winch, the maximum traction force remains constant even when the amount of wire rope extension changes. Also, the capstan type can be configured such that a wire rope can be pulled out in two directions, the front side and the rear side of the vehicle, with a single winch. However, there is a non - zero possibility that an operator may misjudge the maximum traction force and misjudge the remaining traction force because the maximum traction force is different when the wire rope is paid out to the front side of the vehicle and when it is paid out to the rear side of the vehicle. The technologies described in Patent Documents 1 and 2 above are not of the configuration with front - and - rear pulling by a capstan winch, nor are they intended to prevent an operator involved in winch operation from misjudging the remaining traction force. Therefore, an object of the present invention is to provide a vehicle equipped with a front - and - rear pulling winch that allows an operator involved in winch operation to accurately grasp the remaining traction force according to the extension direction during operation.

Means for Solving the Problems

[0005] The vehicle 1 equipped with a front and rear winch according to claim 1 of the present invention has a capstan winch 10 provided at the rear of the vehicle, and a wire rope 20 wound around the capstan winch 10 a predetermined number of times and having its tip disposed at the front of the vehicle 1A via a folding material 50 on the rear surface 1B of the vehicle. It is a vehicle capable of selectively performing a forward pull in which the wire rope 20 is pulled out from the front side of the vehicle to tow a towed object, and a rear pull in which the wire rope 20 is pulled out from the rear side of the vehicle by taking out the folding material 50 through which the wire rope 20 passes to tow the towed object. The vehicle is provided with an operating device 70 used for operating the capstan winch 10, an extension direction detector 60 used for detecting which of the forward pull and the rear pull is being performed, a tensile force measuring device used for measuring the tensile force generated in the wire rope 20, and a deriving means 91 for deriving the remaining capacity as the remaining force up to the maximum tensile force of the wire rope 20 according to the extension direction based on the detection result of the extension direction detector 60 and the measurement result of the tensile force measuring device. The remaining capacity is characterized by being displayed on the display unit 71 of the operating device 70. The present invention according to claim 2 is characterized in that, in the vehicle 1 equipped with a front and rear winch according to claim 1, the maximum tensile force when performing a rear pull is set to be 1.5 times or more and 1.9 times or less the maximum tensile force when performing a forward pull. The present invention according to claim 3 is characterized in that, in the vehicle 1 equipped with a front and rear winch according to claim 1, as the extension direction detector 60, a limit switch for detecting the attachment / detachment of the folding material 50 or the insertion / removal of a detachable pin 51 fixing the folding material 50 is provided, and the deriving means 91 determines the extension direction of the wire rope 20 based on the operation of the limit switch. The present invention according to claim 4 is characterized in that, in the vehicle 1 equipped with a front and rear winch according to claim 1, as the extension direction detector 60, a proximity switch for detecting the attachment / detachment of the folding material 50 or the insertion / removal of a detachable pin 51 fixing the folding material 50 is provided, and the deriving means 91 determines the extension direction of the wire rope 20 based on the operation of the proximity switch. The present invention according to claim 5 is the vehicle 1 equipped with a winch for pulling forward and backward according to claim 1, further comprising an extension amount measuring device 80 used for measuring the extension amount of the wire rope 20, wherein the derivation means 91 derives the remaining extendable length up to the maximum extension length of the wire rope 20 according to the extension direction based on the detection result of the extension direction detector 60 and the measurement result of the extension amount measuring device 80, and the remaining length is displayed on the display unit 71 of the operating device 70. The present invention according to claim 6 is the vehicle 1 equipped with a winch for pulling forward and backward according to claim 5, wherein the operating device 70 is provided with a display switching button 73, and each time the display switching button 73 is pressed, the tensile force, the remaining capacity, and the remaining length are sequentially displayed one by one on the display unit 71 of the operating device 70. The present invention according to claim 7 is the vehicle 1 equipped with a winch for pulling forward and backward according to claim 5, wherein the extension amount measuring device 80 includes a rotating body 81 through which the wire rope 20 passes and rotates as the wire rope 20 moves, and a rotary encoder 83 for detecting the rotation amount of the rotating body 81, and the derivation means 91 derives the extension amount based on the rotation amount of the rotating body 81 in the extension amount measuring device 80.

Advantages of the Invention

[0006] In the vehicle equipped with a winch for pulling forward and backward of the present invention, an operator involved in the operation of the winch can accurately grasp the different towing remaining forces depending on whether it is pulling forward or backward during the operation.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiment for Carrying out the Invention

[0008] The vehicle equipped with a front and rear winch according to the first embodiment of the present invention has a capstan winch provided at the rear of the vehicle and a wire rope wound around the capstan winch a predetermined number of times and having a tip disposed at the front of the vehicle via a folding material on the rear surface of the vehicle. The vehicle is capable of selectively performing a forward pull in which the wire rope is pulled out from the front side of the vehicle to tow a towed object, and a rear pull in which the wire rope is pulled out from the rear side of the vehicle to tow the towed object by taking out the folding material through which the wire rope passes. The vehicle is provided with an operating device used for operating the capstan winch, an extension direction detector used for detecting which of the forward pull and the rear pull is being performed, a tensile force measuring device used for measuring the tensile force generated in the wire rope, and a deriving means for deriving a remaining capacity as a remaining force up to the maximum tensile force of the wire rope according to the extension direction based on the detection result of the extension direction detector and the measurement result of the tensile force measuring device. The remaining capacity is displayed on the display unit of the operating device. According to the present embodiment, since different remaining capacities are displayed on the operating device in real time depending on whether it is a forward pull or a rear pull, the operator of the winch can proceed with the work safely while correctly grasping the remaining capacity.

[0009] The second embodiment of the present invention is the vehicle equipped with a front and rear winch according to the first embodiment, in which the maximum tensile force in the case of performing a rear pull is set to be 1.5 times or more and 1.9 times or less the maximum tensile force in the case of performing a forward pull. According to the present embodiment, although the maximum tensile force in the case of a rear pull is theoretically twice that in the case of a forward pull, by setting it smaller than the theoretical value in consideration of the vehicle body strength and the like, the safety can be improved.

[0010] In the third embodiment of the present invention, in the vehicle equipped with the front and rear winches according to the first embodiment, as an extension direction detector, a limit switch for detecting the attachment / detachment of the folding material or the insertion / removal of the detachable pin fixing the folding material is provided, and the derivation means determines the extension direction of the wire rope based on the operation of the limit switch. According to this embodiment, the extension direction can be detected based on the attachment / detachment state of the folding material or the insertion / removal state of the fixing pin.

[0011] In the fourth embodiment of the present invention, in the vehicle equipped with the front and rear winches according to the first embodiment, as an extension direction detector, a proximity switch for detecting the attachment / detachment of the folding material or the insertion / removal of the detachable pin fixing the folding material is provided, and the derivation means determines the extension direction of the wire rope based on the operation of the proximity switch. According to this embodiment, the extension direction can be detected based on the attachment / detachment state of the folding material or the insertion / removal state of the fixing pin.

[0012] In the fifth embodiment of the present invention, in the vehicle equipped with the front and rear winches according to the first embodiment, an extension amount measuring device used for measuring the extension amount of the wire rope is further provided, and the derivation means derives the remaining extendable length up to the maximum extension length of the wire rope corresponding to the extension direction based on the detection result of the extension direction detector and the measurement result of the extension amount measuring device, and the remaining length is displayed on the display unit of the operating device. According to this embodiment, different remaining lengths are displayed in real time on the operating device depending on whether it is a forward pull or a backward pull, so the winch operator can work safely while correctly grasping the remaining length.

[0013] In the sixth embodiment of the present invention, in the vehicle equipped with the front and rear winches according to the fifth embodiment, a display switching button is provided on the operating device, and each time the display switching button is pressed, the tensile force, the remaining capacity, and the remaining length are sequentially displayed one by one on the display unit of the operating device. According to this embodiment, the operator of the winch can proceed with the work while switching each item as necessary.

[0014] In the seventh embodiment of the present invention, in the vehicle equipped with a front and rear pulling winch according to the fifth embodiment, the extension amount measuring device includes a rotating body through which a wire rope passes and rotates as the wire rope moves, and a rotary encoder that detects the rotation amount of the rotating body. The derivation means derives the extension amount based on the rotation amount of the rotating body in the extension amount measuring device. According to this embodiment, the extension amount can be accurately derived.

Example

[0015] Hereinafter, a vehicle equipped with a front and rear pulling winch according to an embodiment of the present invention will be described. FIG. 1 is an arrangement diagram of mainly winch-related devices of the vehicle equipped with a front and rear pulling winch according to this embodiment. FIG. 1(a) is a top view, and FIG. 1(b) is a right side view. In FIG. 1, the right side is the front side of the vehicle. FIG. 2 is a diagram showing the extension part of the wire rope. FIG. 2(a) is the extension part (rear pulling part) at the rear of the vehicle, and FIG. 2(b) is the extension part (front pulling part) at the front of the vehicle. FIG. 3 is a photograph showing the extension part of the wire rope at the rear of the vehicle. FIG. 3(a) is taken from the front, and FIG. 3(b) is taken obliquely from above. FIG. 4 is a front view of the operator. The vehicle 1 equipped with a front and rear pulling winch (hereinafter sometimes simply referred to as "vehicle") is a rescue work vehicle that operates at disaster sites, fire sites, etc. In addition to the front and rear pulling winches, it is equipped with a crane, a lighting device, etc. In vehicle 1, as equipment related to the winch, there are a capstan winch 10 installed between the chassis frames at the rear of the vehicle, a wire rope 20 that can be wired so as to be pulled out from two locations on the front side and the rear side of the vehicle, a rope container (reel winder) 30 in which the wire rope 20 is accommodated, a tension applying device (wire holder) 40 installed in front of the capstan winch 10 to apply appropriate tension to the wire rope 20, a folding member 50 installed on the rear surface 1B of the vehicle to change the direction of the wire rope 20, an extension direction detector 60 used to detect from which side, the front side or the rear side of the vehicle, the wire rope 20 extends, a tensile force measuring device (not shown) for measuring the tensile force generated in the wire rope 20, an operating device 70 used for operating the capstan winch 10, an extension amount measuring device 80 used for measuring the extension amount of the wire rope 20, and a control device 90 that receives a signal from the operating device 70, controls the operation of the capstan winch 10, and transmits predetermined data to the operating device 70.

[0016] The power source of the front and rear pulling winch uses PTO (Power Take Off). Power is taken out from the power take-off port of the vehicle 1 and the capstan winch 10 is driven by a hydraulic motor through an oil pump and a hydraulic unit. The tensile force of the wire rope 20 is generated by the capstan winch 10. The wire rope 20 is wound only in one layer and six turns around the constricted winding drum of the capstan winch 10. The wire rope 20 wound around the capstan winch 10 is accommodated in a spiral shape in the rope container 30 after passing through the tension applying device 40. The rope container 30 is arranged below the capstan winch 10 and is designed to rotate freely by the force of pushing in the wire rope 20.

[0017] The tension applying device 40 is driven by a hydraulic motor with the wire rope 20 between the capstan winch 10 and the rope container 30 sandwiched between two rollers, and applies appropriate tension to the wire rope 20. Incidentally, if the tension applying device 40 is not provided and an appropriate tension is not applied to the wire rope 20, the take-up drum of the capstan winch 10 around which the wire rope 20 is wound will rotate idly, so that the capstan winch 10 cannot generate a tensile force on the wire rope 20.

[0018] FIG. 5 is a diagram schematically showing the arrangement of the capstan winch, wire rope, etc. The wire rope 20 that exits the rope storage container 30 passes through the tension applying device 40, the capstan winch 10, and the extension measuring device 80 and reaches the rear surface 1B of the vehicle. On the rear surface 1B of the vehicle, rear surface through-holes 53 with four-sided rotating rollers arranged therein are provided one on each of the left and right sides. The wire rope 20 once exits the vehicle through the rear surface through-hole 53 on the left side of the vehicle, is turned by the turning member 50, enters the vehicle again through the rear surface through-hole 53 on the right side of the vehicle, and passes through the right side of the vehicle to reach the front surface through-hole 52 on the front surface 1A of the vehicle. The wire rope 20 passes through the inside of the guide pipe except for a part to avoid contact with other devices etc. Also, in order to avoid interference with other devices etc., the direction is appropriately adjusted midway using sheaves (pulleys) etc.

[0019] In this embodiment, a sheave (pulley) is used as the turning member 50 on the rear surface 1B of the vehicle, and the wire rope 20 is passed along the groove of the sheave. Further, the turning member 50 is provided with a shackle pin attachment portion 50A into which the pin of the shackle used for connection to the object to be towed is inserted. The turning member 50 is fixed to the vehicle 1 by a detachable pin 51 at a predetermined position when rear towing (towing on the rear surface 1B side of the vehicle) is not performed. Then, when rear towing is performed, the detachable pin 51 is pulled out and the turning member 50 is taken out. Since the wire rope 20 is passed through the turning member 50, the wire rope 20 is pulled out together when the turning member 50 is taken out.

[0020] Near the front bumper of the vehicle front 1A, a front through-hole 52 with a two-sided rotating roller is provided. The wire rope 20 extends out from the front through-hole 52 and fixes its tip to a shackle provided below the through-hole when not in traction or when performing backward pulling. When performing forward pulling (traction on the vehicle front 1A side), the wire rope 20 is detached from the shackle and pulled out.

[0021] A strain gauge is attached to the main shaft of the capstan winch 10 as a tensile force measuring device. The torsional stress of the main shaft measured by the strain gauge is transmitted to a derivation means 91 such as a computer included in the control device 90. FIG. 6 is a diagram showing the structure of the extension amount measuring device. FIG. 6(a) is a side view, and FIG. 6(b) is a cross-sectional view taken along line A-A. The extension amount measuring device 80 installed between the capstan winch 10 and the vehicle rear 1B includes one cylindrical first rotating body 81 and two constricted second rotating bodies 82. A rotary encoder 83 is provided on the first rotating body 81. The first rotating body 81 and the second rotating bodies 82 are arranged in parallel with the first rotating body 81 at the center with a predetermined gap so as not to contact each other, and the second rotating bodies 82 are located lower than the first rotating body 81. The first rotating body 81 and the second rotating bodies 82 rotate with the movement of the wire rope 20. The rotation speed of the first rotating body 81 is acquired by the rotary encoder 83 and transmitted to the derivation means 91. The derivation means 91 derives the extension amount based on the received rotation speed. Thereby, the extension amount can be accurately obtained.

[0022] The derivation means 91 derives the tensile force generated in the wire rope 20 based on the torsional stress received from the tensile force measuring device, and derives the extension amount of the wire rope 20 based on the rotation speed received from the extension amount measuring device 80. The derivation means 91 further derives the remaining capacity as the traction remaining force based on the derived tensile force and the maximum tensile force, and derives the remaining length that can be extended based on the derived extension amount and the extension limit point. The extension limit point is the length at which a predetermined number of winding turns (6 turns in one layer in this embodiment) of the capstan winch 10 cannot be maintained when extended further. Here, since the front and rear winches in this embodiment are structured to wind one wire rope 20 from the rear to the front as described above, there are differences in the maximum tensile force and the like between the case of forward pulling and the case of backward pulling. Specifically, the maximum tensile force is greater in the case of backward pulling, and the maximum pulling speed and the maximum extension amount are smaller in the case of backward pulling. Therefore, when deriving the remaining capacity and the remaining length, the deriving means 91 determines whether it is forward pulling or backward pulling by using the extension direction detector 60.

[0023] In this embodiment, a limit switch or a proximity switch that detects the insertion and removal of the detachable pin 51 is used as the extension direction detector 60. When performing backward pulling, the detachable pin 51 must be removed to take out the folding material 50. Therefore, the deriving means 91 can detect the extension direction based on the insertion and removal state of the detachable pin 51, for example, by determining that backward pulling is being performed when the limit switch or the proximity switch does not detect the detachable pin 51. Alternatively, a limit switch or a proximity switch that directly detects the attachment and detachment of the folding material 50 instead of detecting the insertion and removal of the detachable pin 51 can also be used as the extension direction detector 60. When performing backward pulling, the folding material 50 must be removed. Therefore, the deriving means 91 can detect the extension direction based on the attachment and detachment state of the folding material 50, for example, by determining that backward pulling is being performed when the limit switch or the proximity switch does not detect the folding material 50. Note that the extension direction detector 60 only needs to be able to reliably detect the detachable pin 51 or the folding material 50 and be able to convert the detection presence or absence into an electrical signal. For example, other switches or sensors such as an optical sensor can also be used. When the deriving means 91 determines that forward pulling is being performed, it derives the remaining capacity and the remaining length as they are. However, when it determines that backward pulling is being performed, it sets the maximum tensile force to be greater and the extension limit point to be smaller than in the case of forward pulling, and then derives the remaining capacity and the remaining length. In the case of rear pulling, the maximum tensile force is preferably 1.5 times or more and 1.9 times or less, more preferably 1.6 times or more and 1.8 times or less, taking into account the vehicle body strength and the like. The maximum tensile force in the case of rear pulling is theoretically twice that in the case of front pulling, but by setting it smaller than the theoretical value in consideration of the vehicle body strength and the like, the safety can be improved. The control device 90 transmits data on the tensile force generated in the wire rope 20, the remaining capacity, and the remaining length derived by the derivation means 91 to the operating device 70.

[0024] The operating device 70 shown in FIG. 4 is a wired remote operation type. Note that the operating device 70 can also be wireless. The operating device 70 is provided with a display unit 71, a winch operation selection button 72, a display switching button 73, a winch speed operation dial 74, and a winch operation button 75. The winch operation selection button 72 has an operation button 72a for selecting an operation (extension operation) of extending the wire rope 20 with the clutch engaged, a draw button 72b for selecting an operation (drawing operation) of extending the wire rope 20 with the clutch disengaged, and a winding button 72c for selecting an operation (winding operation) of winding up the wire rope 20 with the clutch engaged. While the winch operation button 75 is pressed, the extension operation or the winding operation is performed. The winch speed operation dial 74 is used to adjust the rotational speed of the capstan winch 10 during the extension operation or the winding operation, and the speed increases when it is turned in the H direction. Since the display unit 71 can display not only the tension but also the remaining capacity and the remaining length in real time, the operator can smoothly proceed with the work while correctly grasping at a glance the different remaining capacities and remaining lengths depending on whether it is front pulling or rear pulling. As a result, it is surely prevented that the pulling remaining force is accidentally exceeded or the wire rope 20 is pulled out beyond the extension limit point. The display unit 71 can selectively display any one of the tensile force (tension), remaining capacity, and remaining length. The item (value) displayed on the display unit 71 switches in order each time the operator presses the display switching button 73. As a result, the operator can proceed with the work while switching each item as needed.

[0025] On the vehicle front face 1A and the vehicle rear face 1B, in the vicinity of the extending portion of the wire rope 20, a display 100 is provided that can selectively display any one of the tensile force (tension), remaining capacity, and remaining length, similar to the display unit 71. The display 100 has a tumbler switch for display switching, and by operating this tumbler switch, the item (value) displayed on the display 100 can be switched in order. The display 100 on the vehicle front face 1A is installed facing left of the vehicle inside a metal cover with an open side surface, and the display 100 on the vehicle rear face 1B is installed facing the rear of the vehicle. In the photograph of FIG. 3, the display 100 on the vehicle rear face 1B has been removed. The display items on the wired type of operator 70 and the display items on the display 100 are interlocked. For example, when the display switching button 73 of the wired type of operator 70 is pressed, not only the display on the display unit 71 but also the display on the display 100 switches. On the other hand, the display items on the wireless type of operator 70 are not interlocked with the display items on the wired type of operator 70 or the display items on the display 100 and can be switched independently.

[0026] On the side surface of the cab lower frame of the vehicle 1, an emergency operation unit 110 having a manual operation lever and two tumbler switches is provided. The emergency operation unit 110 is used when, for example, the operator 70 malfunctions and the operation of the hydraulic valve by electric control becomes impossible while the wire rope 20 is pulled out. With the manual operation lever, a pay-out operation and a winding operation can be performed. One of the tumbler switches is for ON / OFF of winding, and the other is for engagement / disengagement of the clutch. An operation example of the emergency operation unit 110 with the wire rope 20 pulled out is shown below. 1. When using the wired operator 70, remove the cable of the operator 70 from the insertion port of the vehicle 1. When using the wireless operator 70, turn off the power of the operator 70. 2. Set one tumbler switch to "Winch ON" and the other tumbler switch to "Clutch Engaged". 3. Operate the manual operation lever to wind up the wire rope 20 to a predetermined position. 4. Switch one tumbler switch to "Winch OFF". Keep the other tumbler switch in the "Clutch Engaged" position without switching. Note that it is also possible to provide a display near the manual operation lever that can display tension, remaining capacity, and remaining length, similar to the display unit 71.

Explanation of Reference Signs

[0027] 1 Vehicle equipped with a winch for pulling back and forth 1A Front of the vehicle 1B Rear of the vehicle 10 Capstan winch 20 Wire rope 50 Folding material 51 Detachable pin 60 Extension direction detector 70 Operator 71 Display unit 73 Display switch button 80 Extension amount measuring device 81 First rotating body 83 Rotary encoder 90 Control device 91 Derivation means

Claims

1. A vehicle having a capstan winch provided at the rear of the vehicle and a wire rope wound around the capstan winch a predetermined number of times and having a tip disposed at the front of the vehicle via a folding material on the rear surface of the vehicle, the vehicle being capable of selectively performing a forward pull of pulling out the wire rope from the front side of the vehicle to tow a towed object and a backward pull of pulling out the wire rope from the rear side of the vehicle to tow the towed object by taking out the folding material through which the wire rope is passed, an operating device used for operating the capstan winch, an extension direction detector used for detecting which of the forward pull and the backward pull is being performed, a tensile force measuring device used for measuring the tensile force generated in the wire rope, and a deriving means for deriving a remaining capacity as a remaining force up to the maximum tensile force of the wire rope according to the extension direction based on the detection result of the extension direction detector and the measurement result of the tensile force measuring device, wherein the remaining capacity is displayed on a display unit of the operating device. A vehicle equipped with a front and rear pulling winch characterized by this.

2. The vehicle equipped with a front and rear pulling winch according to Claim 1, wherein the maximum tensile force when performing the backward pull is set to be 1.5 times or more and 1.9 times or less the maximum tensile force when performing the forward pull.

3. The vehicle equipped with a front and rear pulling winch according to Claim 1, wherein the extension direction detector includes a limit switch for detecting the attachment / detachment of the folding material or the insertion / removal of a detachable pin fixing the folding material, and the deriving means determines the extension direction of the wire rope based on the operation of the limit switch.

4. The vehicle equipped with a front and rear pulling winch according to Claim 1, wherein the extension direction detector includes a proximity switch for detecting the attachment / detachment of the folding material or the insertion / removal of a detachable pin fixing the folding material, and the deriving means determines the extension direction of the wire rope based on the operation of the proximity switch.

5. The vehicle further includes an extension amount measuring device for measuring the extension amount of the wire rope, the deriving means derives a remaining extendable length up to the maximum extension length of the wire rope according to the extension direction based on the detection result of the extension direction detector and the measurement result of the extension amount measuring device, and the remaining length is displayed on the display unit of the operating device. A vehicle equipped with a front and rear pulling winch characterized by this according to Claim 1.

6. The operating device is provided with a display switching button, and each time the display switching button is pressed, the tensile force, the remaining capacity, and the remaining length are sequentially displayed one by one on the display unit of the operating device. The vehicle equipped with a front and rear pulling winch according to claim 5, characterized in that.

7. The extension amount measuring device includes a rotating body through which the wire rope passes and that rotates as the wire rope moves, and a rotary encoder that detects the amount of rotation of the rotating body. The deriving means derives the extension amount based on the amount of rotation of the rotating body in the extension amount measuring device. The vehicle equipped with a front and rear pulling winch according to claim 5, characterized in that.

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