Telescopic draw bar

Abstract

The utility model discloses a telescopic traction rod, and belongs to the technical field of traction. The device is characterized by comprising a fixed rod, a telescopic rod, a pin shaft, a telescopic assembly and a sliding block assembly, the interior of the fixing rod is hollow, and the two side walls of the fixing rod are each provided with a fixing hole. The telescopic rod is sleeved with the cavity of the fixing rod, and at least two locking holes are formed in one side wall of the telescopic rod. The pin shaft is sequentially inserted into one fixing hole of the fixing rod and one locking hole of the telescopic rod so as to fix the length of the traction rod; the telescopic assembly is used for driving the pin shaft to stretch out or retract, and the sliding block assembly is inserted into the other fixing hole of the fixing rod and abuts against the other side wall of the telescopic rod. The hinge pin is inserted into the fixing hole and the locking hole through the telescopic assembly capable of resetting automatically, the length of the draw bar is adjusted, and the draw bar is simple in structure, low in cost and high in reliability.

Description

Technical Field

[0001] This utility model relates to a retractable tow bar, and relates to the field of trailer traction technology. Background Technology

[0002] A drawbar is a fixed connection device between vehicle bodies. Currently, the retractable drawbars used on trailers in China generally consist of a fixed rod, a telescopic rod, and a pin connecting the fixed rod and the telescopic rod. Most of these retractable drawbars require manual insertion and removal of the pin, necessitating at least two people to adjust the length, which is time-consuming and labor-intensive. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of the prior art by providing a novel telescopic traction rod. This invention uses an automatically resetting telescopic assembly to insert a pin into a fixing hole and a locking hole to adjust the length of the traction rod. It features a simple structure, low cost, and high reliability.

[0004] The purpose of this utility model is achieved through the following technical solution: a telescopic traction rod, characterized in that it includes a fixed rod, a telescopic rod, a pin, a telescopic assembly, and a slider assembly; wherein, the fixed rod is hollow inside, and each of its two side walls is provided with a fixing hole; the telescopic rod is fitted into the cavity of the fixed rod, and its one side wall is provided with at least two locking holes; the pin is sequentially inserted into one fixing hole of the fixed rod and one locking hole of the telescopic rod (the fixing hole and one of the locking holes are positioned correspondingly), thereby fixing the length of the traction rod; the telescopic assembly is used to drive the pin to extend or retract, and the slider assembly is inserted into the other fixing hole of the fixed rod and abuts against the other side wall of the telescopic rod.

[0005] In the above scheme, the fixed rod is hollow inside and a telescopic rod is installed. The telescopic rod can slide along the length of the fixed rod. Two fixing holes are symmetrically arranged on the fixed rod (both sides). One fixing hole cooperates with the telescopic component, and the other fixing hole cooperates with the slider component. At least two locking holes are provided on the telescopic rod. The length of the telescopic rod extending out of the fixed rod is adjusted by inserting a control pin into different locking holes.

[0006] Furthermore, the telescopic assembly includes a linear drive element, which can be any telescopic drive device that can automatically reset, such as a hydraulic cylinder or a pneumatic cylinder.

[0007] Furthermore, the telescopic assembly also includes a spring; the linear drive element is a hydraulic cylinder or a pneumatic cylinder, including a cylinder body, a piston, and a piston rod; the pin is installed at the end of the piston rod, and the spring is installed in the cylinder body and located between the piston and the bottom of the cylinder body.

[0008] In the above scheme, when the pin is aligned with the fixing hole on the fixed rod and the corresponding locking hole on the telescopic rod, and the linear drive element disconnects the air source or high-pressure oil, the spring returns to its original position. Under the action of the spring force, the piston extends, driving the pin to extend. The pin inserts into the fixing hole and the corresponding locking hole, fixing the fixed rod and the telescopic rod to fix the length of the traction rod. When compressed air or high-pressure oil enters the cylinder, it pushes the piston to retract, causing the pin to retract. At this time, the position of the telescopic rod in the cavity of the fixed rod can be adjusted to adjust the length of the traction rod.

[0009] Furthermore, the slider assembly includes: a slider and a slider holder; the slider holder is fixed to the side wall of the fixing rod, and the slider has external threads and is threadedly connected to the slider holder. Preferably, the slider is composed of a thin rod portion and a thick head portion; the thick head portion is used to insert into the fixing hole of the fixing rod; the thin rod portion has external threads and is threadedly connected to the slider holder; the displacement of the slider is controlled by rotating the thin rod portion.

[0010] In the above scheme, the slider is connected to the slider holder fixed on the fixed rod by external thread. The length of the slider extending out of the slider holder can be adjusted by rotating the slider so that the slider contacts the side of the telescopic rod and clamps the telescopic rod to prevent it from shaking.

[0011] Furthermore, it also includes a detection component, which includes a sensor and a detection rod; one end of the detection rod is fixedly connected to the end of the piston, and the other end extends out of the bottom of the cylinder body; the sensor is located outside the bottom of the cylinder body and is used to sense the position of the detection rod; and the spring is sleeved on the detection rod.

[0012] In the above scheme, one end of the piston is connected to the pin, and the other end is connected to the detection rod, driving the pin and the detection rod to move; the sensor can be a proximity switch or a limit switch, etc. When the cylinder is disconnected from the air supply or high-pressure oil, the spring returns to its original position, and the pin extends under the spring force, while the detection rod retracts into the cylinder, and the sensor cannot detect the detection rod; when compressed air or high-pressure oil enters the cylinder, the piston drives the pin to retract, the detection rod extends, and the sensor can detect the detection rod; the sensor can send a signal to the cab to inform the operator of the status of the towing rod.

[0013] Furthermore, it also includes a limiting component, which includes a first limiting block, a second limiting block, and a stop block; the stop block is disposed at the bottom of the cavity of the fixed rod, the first limiting block and the second limiting block are respectively disposed at the bottom of the telescopic rod, and the stop block is located between the first and second limiting blocks.

[0014] In the above scheme, the stop block is welded or assembled to the bottom of the cavity of the fixed rod by fasteners, and the first and second limit blocks are welded or assembled to the bottom of the telescopic rod by fasteners. The stop block at the bottom of the cavity of the fixed frame is located between the two limit blocks at the bottom of the telescopic rod. When the telescopic rod keeps retracting into the fixed frame (or extending outward), the stop block will contact the limit block, thereby limiting the telescopic rod's extension and retraction, and preventing the telescopic rod from being completely retracted into (or extended outward) from the fixed rod, which would cause equipment damage.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1) This utility model can realize the automatic insertion and removal of the pin of the traction rod without manual operation, which is convenient and reduces labor and time costs;

[0017] 2) This utility model uses the restoring force of the telescopic component to press the pin against the side of the telescopic rod; when the pin is aligned with the locking hole on the telescopic rod, the pin is automatically inserted into the locking hole under the drive of the telescopic component. The system is simple, low in cost, and highly reliable.

[0018] 3) The telescopic device is equipped with a detection rod and a sensor, which can determine whether the pin is in a locked or pulled-out state, and indicate to the driver whether the telescopic rod can be adjusted or whether the vehicle behind can be towed.

[0019] 4) This utility model has two limiting blocks on the telescopic rod and a stop block on the fixed rod to avoid damage to the equipment caused by excessive contraction or extension. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the retractable traction rod of this utility model;

[0021] Figure 2 This is a partial schematic diagram of the working state of the telescopic component, the fixed rod, and the telescopic rod in this utility model.

[0022] Figure 3 This is a partial schematic diagram of the internal structure of the fixing rod in this utility model.

[0023] Figure 4 This is a schematic diagram of the bottom structure of the telescopic rod in this utility model;

[0024] Figure 5 This is a schematic diagram showing the working state of the limiting component in this utility model;

[0025] Figure 6 This is a schematic diagram of the telescopic component in this utility model (with the pin protruding).

[0026] Figure 7 This is a schematic diagram of the telescopic component in this utility model (with the pin retracted).

[0027] Figure 8 This is a schematic diagram of the slider assembly in this utility model;

[0028] In the figure: 1 Telescopic rod, locking hole 1-1, 2 Fixed rod, fixed hole 2-1, 3 Linear drive element, 3-1 Cylinder body, 3-2 Piston, 3-3 Piston rod, 4 Telescopic assembly fixing frame, 5 Pin, 6 Slider, 6-1 Thin rod part, 6-2 Thick head, 7 Slider fixing frame, 8 Stop block, 9 First limit block, 10 Second limit block, 11 Sensor, 12 Detection rod, 13 Spring. Detailed Implementation

[0029] A retractable tow bar, such as Figure 1 As shown, it includes a telescopic rod 1, a fixed rod 2, a pin 5, a telescopic assembly, and a slider assembly. Among them, as... Figure 1 , Figure 2 As shown, the fixed rod 2 is hollow inside, and each of its two side walls is provided with a fixed hole 2-1; the telescopic rod 1 is fitted into the cavity of the fixed rod and can slide along the length of the fixed rod, and its side wall is provided with at least two locking holes 1-1; the pin 5 is inserted into one fixed hole of the fixed rod and one locking hole of the telescopic rod in sequence (the fixed hole and one of the locking holes are in the same position), thereby fixing the length of the traction rod.

[0030] like Figure 1 As shown, the telescopic assembly is fixed to the side wall of the fixed rod 2 via the telescopic assembly mounting bracket 4, and the slider assembly is fixed to the other side wall of the fixed rod 2 via the slider mounting bracket 7. The fixed rod has two mounting holes; one hole mates with the telescopic assembly, and the other hole mates with the slider assembly.

[0031] like Figure 2 , Figure 6 , Figure 7 As shown, the telescopic assembly includes a linear drive element 3 and a spring 13. The linear drive element is a hydraulic cylinder or a pneumatic cylinder, including a cylinder body 3-1, a piston 3-2, and a piston rod 3-3. A pin 5 is installed at the end of the piston rod, and the spring is installed in the cylinder body and located between the piston and the bottom of the cylinder body.

[0032] In one embodiment of this utility model, such as Figure 1 , Figure 8 As shown, the slider assembly includes a slider 6 and a slider holder 7, with the slider holder 7 fixed to the side wall of the fixing rod. The slider consists of a thin rod portion 6-1 and a thick head portion 6-2 connected together; the thin rod portion is provided with external threads and is threadedly connected to the slider holder, and by rotating the thin rod portion, the thick head portion is inserted into the fixing hole of the fixing rod.

[0033] In one embodiment of this utility model, such as Figure 2 , Figure 6 , Figure 7As shown, the detection assembly includes: a sensor 11 and a detection rod 12; one end of the detection rod is fixedly connected to the end of the piston, and the other end extends out of the bottom of the cylinder body. The sensor (a proximity switch or a limit switch) is located outside the bottom of the cylinder body and is used to sense the position of the detection rod. A spring 13 is sleeved on the detection rod.

[0034] In one embodiment of this utility model, such as Figure 3 , Figure 4 , Figure 5 As shown, the limiting component includes a stop block 8, a first limiting block 9, and a second limiting block 10; the stop block is located at the bottom of the cavity of the fixed rod, and the first limiting block and the second limiting block are respectively located at the bottom of the telescopic rod, with the stop block located between the first and second limiting blocks.

[0035] The above-mentioned retractable tow bar is used in accordance with the following steps:

[0036] 1) In the initial state, driven by the spring 13, the pin 5 is inserted into a fixing hole 2-1 on the fixing rod and the corresponding locking hole 1-1 on the telescopic rod in sequence;

[0037] When it is necessary to adjust the length of the traction rod, that is, to adjust the length of the telescopic rod extending beyond the fixed rod, such as... Figure 7 As shown, when compressed air or high-pressure oil is introduced into cylinder 3-1, piston 3-2 retracts, driving pin 5 to pull out telescopic rod 1. At this time, the traction rod can extend and retract freely. At the same time, the detection rod 12 at the other end of piston 3-2 extends out of the cylinder bottom. Sensor 11 detects the detection rod 12 and transmits a signal to the cab, prompting the operator that pin 5 is in the pulled-out state and the length of telescopic rod 1 extending out of fixed rod 2 can be adjusted.

[0038] 2) When the telescopic rod 1 extends or retracts a certain distance, and the locking hole 1-1 on the telescopic rod 1 is no longer aligned with the pin 5, the air source or high-pressure oil can be automatically or manually disconnected, and the piston 3-2 extends under the force of the spring 13. Since the pin 5 is not aligned with the locking hole 1-1 on the telescopic rod 1, the pin 5 is pressed against the side of the telescopic rod under the drive of the spring 13. At this time, the telescopic rod can still extend or retract freely. At the same time, the detection rod 12 is not fully retracted into the cylinder 3-1. The sensor 11 can detect the detection rod 12 and transmit a signal to the cab, prompting the operator that the pin 5 is in the pulled-out state, and the length of the telescopic rod 1 extending out of the fixed rod 2 can be adjusted.

[0039] 3) When the telescopic rod 1 continues to extend or retract a certain distance, and the locking hole 1-1 on the telescopic rod aligns with the pin 5, as follows: Figure 6 As shown, piston 3-2 is fully reset under the action of spring force, and drive pin 5 is inserted into the locking hole 1-1 of telescopic rod. At this time, telescopic rod is in the locked state; at the same time, detection rod 12 retracts into cylinder 3-1, sensor 11 cannot detect detection rod 12, and transmits a signal to the cab to remind the operator that the pin is locked.

[0040] 4) The length of the traction rod can be adjusted by repeating steps 1) to 3).

[0041] 5) A row of locking holes on the side wall of telescopic rod 1, wherein the two outermost locking holes 1-1 are aligned with the pin 5, the first limiting block 9 (or the second limiting block 10) on the telescopic rod and the stop block 8 on the fixed rod maintain a certain distance.

[0042] If, due to system malfunction or user error, the air supply or high-pressure hydraulic fluid is not disconnected, causing the pin to not be inserted into the locking hole of the telescopic rod, the telescopic rod will continue to extend or retract. Figure 5 As shown, the first limiting block (or the second limiting block) on the telescopic rod contacts the stop block on the fixed rod to prevent the telescopic rod from excessively retracting or extending and damaging the equipment.

Claims

1. A telescoping drawbar characterized by, include: The fixing rod is hollow inside, and each of its two side walls has a fixing hole. The telescopic rod is fitted into the cavity of the fixed rod, and at least two locking holes are provided on one side wall; The pin is inserted into a fixing hole of the fixing rod and a locking hole of the telescopic rod in sequence to fix the length of the traction rod; Telescopic assembly, used to drive the pin to extend or retract; The slider assembly is inserted into another fixing hole of the fixing rod and abuts against the other side wall of the telescopic rod.

2. A telescoping drawbar according to claim 1, characterised in that, The telescopic assembly includes a linear drive element.

3. A telescoping drawbar according to claim 2, characterised in that, The linear drive element is a hydraulic cylinder or a pneumatic cylinder, including a cylinder body, a piston, and a piston rod, with the pin mounted on the end of the piston rod.

4. A telescopic traction rod according to claim 3, characterized in that, The telescopic assembly also includes a spring, which is installed in the cylinder and located between the piston and the bottom of the cylinder.

5. A telescopic traction rod according to claim 1, characterized in that, The slider assembly includes: a slider and a slider holder; the slider holder is fixed to the side wall of the fixing rod, and the slider is provided with external threads and is threadedly connected to the slider holder.

6. A telescopic traction rod according to claim 5, characterized in that, The slider is composed of a thin rod and a thick head; the thick head is used to insert into the fixing hole of the fixing rod; the thin rod is provided with external threads and is threadedly connected to the slider fixing frame.

7. A retractable traction rod according to claim 4, characterized in that, It also includes a detection component, which includes a sensor and a detection rod; one end of the detection rod is fixedly connected to the end of the piston, and the other end extends out of the bottom of the cylinder body; the sensor is located outside the bottom of the cylinder body and is used to sense the position of the detection rod.

8. A retractable traction rod according to claim 7, characterized in that, The spring is placed on the detection rod.

9. A retractable traction rod according to claim 1, characterized in that, It also includes a limiting component, which includes a first limiting block, a second limiting block, and a stop block; the stop block is disposed at the bottom of the cavity of the fixed rod, the first limiting block and the second limiting block are respectively disposed at the bottom of the telescopic rod, and the stop block is located between the first and second limiting blocks.

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