A tractor safety detection device, a tractor and a detection method

Abstract

The application provides a tractor safety detection device, which belongs to the technical field of tractors and specifically relates to a tractor safety detection device, which comprises a secondary locking structure capable of preventing a trailer pin shaft from being pulled out of a saddle of a tractor, the trailer pin shaft being capable of abutting against the secondary locking structure and causing displacement of the secondary locking structure when the trailer pin shaft has a tendency to be pulled out of the saddle; and further comprising a locking state detection device capable of detecting the displacement of the secondary locking structure and capable of sending a detection signal to a control unit of the tractor. The tractor safety detection device can prevent the trailer pin shaft from being pulled out of the saddle of the tractor and can send a detection signal to the control unit of the tractor, indicating that the locking mechanism is not completely locked. The application further provides a tractor and a safety detection method, the control unit of the tractor being capable of judging the locking state of the trailer pin shaft and the saddle according to the detection signal of the locking state detection device and being capable of deciding whether to control a power unit of the tractor to brake and slow down according to the locking state.

Description

Technical Field

[0001] This application relates to the field of tractor technology, specifically to a tractor safety detection device, a tractor, and a detection method. Background Technology

[0002] Currently, after the tractor and trailer are connected, improper operation or other reasons may cause the tractor's saddle locking mechanism to not be fully locked, and the connection position between the saddle and the trailer pin shaft is not easy to observe; this can lead to the trailer and tractor becoming uncoupled during travel, resulting in safety accidents.

[0003] Existing tractor units only have warning devices, such as indicator lights, that can indicate that the locking mechanism is not fully locked. However, these devices only serve a warning purpose and do not have a dedicated safety protection structure to prevent unhooking.

[0004] In addition, after the trailer and the tractor unit become uncoupled, the tractor unit driver needs to manually brake and slow down according to the warning device to avoid a safety accident. The existing tractor unit control system does not have a module that can reasonably control the vehicle speed after the uncoupling occurs. Summary of the Invention

[0005] In view of this, this application provides a tractor safety detection device that can prevent the trailer pin from coming out of the tractor's saddle and can send a detection signal to the tractor control unit that the locking mechanism is not fully locked.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] A tractor safety detection device, comprising:

[0008] A secondary locking structure is provided, which can prevent the trailer pin from coming out of the saddle of the tractor. When the trailer pin tends to come out of the saddle, it can abut against the secondary locking structure and cause the secondary locking structure to move.

[0009] The locking state detection device can detect the displacement of the secondary locking structure and send the detection signal to the tractor control unit.

[0010] Furthermore, the saddle includes a saddle body, which has a central hole and a notch communicating with the central hole. The trailer pin can slide from the notch to the central hole and can lock with the U-shaped plate below the central hole.

[0011] The secondary locking structure includes a limiting protrusion and a locking pin. The limiting protrusion is fixedly mounted on the saddle connecting plate below the saddle, and the locking pin is movably connected to the saddle connecting plate. The locking pin can be screwed into the notch and abut against the limiting protrusion to lock. The limiting protrusion can restrict the radial displacement of the locking pin away from the central hole.

[0012] Furthermore, the secondary locking structure also includes a locking pin support plate hinged to the saddle connecting plate. The locking pin is disposed on the locking pin support plate, and a driving device is connected to the locking pin support plate. The driving device can drive the locking pin support plate to rotate relative to the saddle connecting plate and drive the locking pin to screw in and out of the notch. The driving device is electrically connected to the tractor control unit.

[0013] Furthermore, the locking pin is slidably connected to the locking pin support plate and can slide between the end of the locking pin support plate that is hinged to the saddle connecting plate and the end that is away from the saddle connecting plate; a tension spring is also provided between the locking pin and the locking pin support plate, one end of the tension spring is connected to the locking pin, and the other end of the tension spring is connected to the end of the locking pin support plate that is hinged to the saddle connecting plate.

[0014] When the trailer pin is locked to the U-shaped plate, there is a gap between the locking pin screwed into the notch and the limiting protrusion, and the tension spring is in a free state; when the trailer pin comes out of the U-shaped plate and abuts against the locking pin, the locking pin abuts against the limiting protrusion and the tension spring is in a stretched state.

[0015] Furthermore, the locking state detection device includes a position sensor, which can detect the displacement of the locking pin relative to the locking pin support plate, and the position sensor is electrically connected to the tractor control unit.

[0016] Furthermore, a sliding plate is provided between the locking pin and the locking pin support plate. The sliding plate includes a first connecting arm and a second connecting arm. The bottom of the locking pin is slidably connected to the locking pin support plate through the first connecting arm. A compression spring is installed between the end face of the locking pin away from the hinge end of the locking pin support plate and the saddle connecting plate and the second connecting arm of the sliding plate. When the trailer pin is disengaged from the U-shaped plate and abuts against the locking pin, the compression spring is in a compressed state.

[0017] Furthermore, the position sensor is disposed between the locking pin and the second connecting arm, and the position sensor can detect changes in the distance between the locking pin and the second connecting arm.

[0018] Furthermore, the locking state detection device also includes a drive stroke sensor, which can detect the travel position of the drive device, and the drive stroke sensor is electrically connected to the tractor control unit.

[0019] The tractor safety detection device provided in this application has a secondary locking structure that can prevent the trailer pin from coming out of the tractor's saddle. However, the secondary locking structure cannot replace the connection structure formed by the trailer pin and the U-shaped plate under the saddle. Therefore, a locking status detection device is needed to detect the position of the secondary locking structure and then send the detection signal to the tractor control unit to determine whether the locking mechanism is not fully locked.

[0020] This application also provides a tractor unit, including the tractor unit safety detection device, the tractor unit control unit and the tractor unit power unit, wherein the tractor unit control unit is electrically connected to the tractor unit power unit.

[0021] This application also provides a method for detecting the safety of a tractor unit, including the tractor unit. The tractor unit control unit can determine the locking status of the trailer pin and the saddle based on the detection signal of the locking status detection device, and can decide whether to control the tractor power unit to brake and decelerate based on the locking status.

[0022] The tractor safety detection method provided in this application specifically involves the tractor control unit determining whether the tractor and trailer have become uncoupled based on the detection signal from the locking status detection device. If uncoupling occurs, the tractor control unit can brake and decelerate the tractor power unit of the uncoupled tractor to further prevent vehicle accidents. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is an exploded view of the tractor safety testing device of this application;

[0025] Figure 2 This is a top view of the locked state of the tractor safety detection device of this application;

[0026] Figure 3 This is a side sectional view of the tractor safety detection device in the locked state according to this application;

[0027] Figure 4This is a schematic diagram showing the fully unlocked state of the tractor safety detection device in this application.

[0028] exist Figures 1-4 middle:

[0029] 11. Saddle body; 12. U-shaped plate; 13. Saddle connecting plate; 131. Limiting protrusion; 2. Locking pin support plate; 21. Hinge; 3. Locking pin; 31. Tension spring; 32. Sliding plate; 321. First connecting arm; 322. Second connecting arm; 33. Compression spring; 34. Bolt; 35. Nut; 4. Hydraulic cylinder; 5. Hydraulic cylinder base; 6. Position sensor. Detailed Implementation

[0030] This application provides a tractor safety detection device, the structure of which can prevent the trailer pin from coming out of the tractor's saddle and can send a detection signal to the tractor control unit that the locking mechanism is not fully locked.

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] like Figure 1-4 As shown, this application provides a tractor safety detection device, including a secondary locking structure and a locking status detection device;

[0033] The secondary locking structure can prevent the trailer pin from coming out of the tractor's saddle. When the trailer pin tends to come out of the saddle, it can abut against the secondary locking structure and cause the secondary locking structure to make a certain amount of displacement. This displacement will not cause the trailer pin to come out of the saddle, but the amount of displacement is sufficient for the locking status detection device to detect it.

[0034] After the locking status detection device detects the displacement of the secondary locking structure, it can send the detection signal to the tractor control unit.

[0035] This application provides redundant protection for the connection structure formed by the trailer pin and the U-shaped plate 12 through a secondary locking structure, solving the technical problem in the prior art that there is only a warning device for the trailer pin to come out of the saddle, but no further protective measures. Although the secondary locking structure can prevent the trailer pin from coming out of the saddle, it cannot replace the connection structure formed by the trailer pin and the U-shaped plate 12. Therefore, a locking status detection device is needed to detect the status of the secondary locking structure and send the detection signal to the tractor control unit. The tractor control unit can then take the next step, such as controlling the warning device to alarm the driver, or controlling the vehicle to decelerate.

[0036] Specifically, the saddle includes a saddle body 11, which has a central hole and a notch communicating with the central hole. The trailer pin can slide from the notch to the central hole and can be connected and locked with the U-shaped plate 12 below the central hole.

[0037] Preferably, a saddle connecting plate 13 is connected below the saddle body 11 and the U-shaped plate 12, and both the saddle body 11 and the saddle connecting plate 13 are fixedly connected to the frame.

[0038] The secondary locking structure includes a limiting protrusion 131 and a locking pin 3. The limiting protrusion 131 is fixed on the upper surface of the saddle connecting plate 13, while the locking pin 3 is movably connected to the saddle connecting plate 13. In a preferred embodiment, the lower part of the locking pin 3 can be hinged to the edge of the saddle connecting plate 13, so that the upper end of the locking pin 3 can rotate around the edge of the saddle connecting plate 13. Of course, it can also be movably connected in other ways.

[0039] In this way, the locking pin 3 can be screwed into the notch and locked against the limiting protrusion 131. After the locking pin 3 is locked against the limiting protrusion 131, the limiting protrusion 131 can restrict the radial displacement of the locking pin 3 away from the center hole. If the connection between the trailer pin and the U-shaped plate 12 fails and there is a tendency for the trailer pin to come out of the notch, the trailer pin will abut against the locking pin 3 located in the notch and cause the locking pin 3 to make radial displacement away from the center hole. At this time, the limiting protrusion 131 fixed on the saddle connecting plate 13 prevents the locking pin 3 from making radial displacement away from the center hole, thereby preventing the trailer pin from coming out of the saddle.

[0040] When it is necessary to unlock the trailer pin, first rotate the locking pin 3 relative to the saddle connecting plate 13 to release it from the locking state of the limiting protrusion 131, and then rotate it out of the notch.

[0041] Preferably, the secondary locking structure further includes a locking pin support plate 2 hinged to the saddle connecting plate 13. The locking pin 3 is disposed on the locking pin support plate 2. A driving device is connected to the locking pin support plate 2. The driving device can drive the locking pin support plate 2 to rotate relative to the saddle connecting plate 13 and drive the locking pin 3 to screw into and out of the notch. The driving device is electrically connected to the tractor control unit.

[0042] In this way, under the control of the tractor control unit, the drive device drives the locking pin support plate 2 to rotate, thereby driving the locking pin 3 to screw into and out of the notch. After screwing out of the notch, it will not obstruct the trailer pin shaft. At this time, the trailer pin shaft can enter and exit the notch. Conversely, the drive device can drive the locking pin 3 to screw into the notch and abut against the limiting protrusion 131 to lock it, thereby providing redundant protection for the trailer pin shaft.

[0043] In a preferred embodiment, the drive device is a hydraulic cylinder 4. Of course, in a traction vehicle without a hydraulic system, the drive device can also be a pneumatic cylinder. In this embodiment, the telescopic end of the hydraulic cylinder 4 is fixedly connected to the bottom of the locking pin support plate 2, and the other end is fixed to the frame.

[0044] In this way, when the extension end of the hydraulic cylinder 4 extends, it can drive the locking pin support plate 2 to rotate around the edge of the saddle connecting plate 13 and rise to be flush with it. At this time, the locking pin 3 is also driven to be screwed into the notch.

[0045] When the telescopic end of the hydraulic cylinder 4 retracts, it can drive the locking pin support plate 2 to descend relative to the edge of the saddle connecting plate 13, at which time the locking pin 3 is also driven to rotate out of the notch.

[0046] To avoid the locking pin 3 being too abruptly screwed into the notch and abutting against the limiting protrusion 131 to form a locking structure, preferably, the locking pin 3 is slidably connected to the locking pin support plate 2 and can slide between the end of the locking pin support plate 2 that is hinged to the saddle connecting plate 13 and the end that is away from the saddle connecting plate 13; a tension spring 31 is also provided between the locking pin 3 and the locking pin support plate 2, one end of the tension spring 31 is connected to the locking pin 3, and the other end of the tension spring 31 is connected to the end of the locking pin support plate 2 that is hinged to the saddle connecting plate 13;

[0047] In this way, when the trailer pin and the U-shaped plate 12 are locked, there is a gap between the locking pin 3 screwed into the notch and the limiting protrusion 131, and the tension spring 31 is in a free state. Thus, the locking pin 3 screwed into the notch and the limiting protrusion 131 do not directly abut against each other, and there is a gap between them. This gap can provide a buffering effect for the locking of the two. Only after the trailer pin disengages from the U-shaped plate 12 and abuts against the locking pin 3, providing a radial force to the locking pin 3 away from the central hole, does the locking pin 3 abut against the limiting protrusion 131 and form a locking structure. At this time, the pin is pushed away from the hinge end of the locking pin support plate 2, so the tension spring 31 is in a stretched state. After the external force applied by the trailer pin to the locking pin 3 is removed, the tension spring 31 can drive the locking pin 3 to approach the hinge end of the locking pin support plate 2 and return to a free state. That is, the tension spring 31 can reset the locking pin 3.

[0048] Preferably, the locking state detection device includes a position sensor 6, which can detect the displacement of the locking pin 3 relative to the locking pin support plate 2, and the position sensor 6 is electrically connected to the tractor control unit.

[0049] When the trailer pin comes off the U-shaped plate 12, it will abut against the locking pin 3, which will cause the locking pin 3 to move radially within the notch. That is, the locking pin 3 will slide relative to the locking pin support plate 2. By setting the position sensor 6 to detect whether the locking pin 3 is displaced relative to the locking pin support plate 2, it can be used to detect whether the trailer pin and the saddle are in a state of not being fully locked.

[0050] Of course, the locking state detection device can also be other types of sensors, such as pressure sensors. For example, a pressure sensor can be installed at the part where the locking pin 3 abuts against the trailer pin to detect the pressure generated on the locking pin 3 when the trailer pin comes out, so as to determine whether the trailer pin and the saddle are in an unlocked state.

[0051] Furthermore, a sliding plate 32 is provided between the locking pin 3 and the locking pin support plate 2. The sliding plate 32 includes a first connecting arm 321 and a second connecting arm 322. The sliding plate 32 and the locking pin 3 are connected by a pin to form an integral fixed connection. The first connecting arm 321 is slidably connected to the locking pin support plate 2. A compression spring 33 is installed between the end face of the locking pin 3 away from the hinge end of the locking pin support plate 2 and the saddle connecting plate 13 and the second connecting arm 322 of the sliding plate 32. When the trailer pin comes off the U-shaped plate 12 and abuts against the locking pin 3, the sliding plate 32 drives the locking pin 3 to slide to the limit position of the locking pin support plate 2. The force applied by the trailer pin to the locking pin 3 will make the locking pin 3 relatively close to the sliding plate 32, that is, the gap between the two is compressed. At this time, the compression spring 33 is in a compressed state, and the compression spring 33 plays a buffering role between the two.

[0052] In addition, when the extension end of the hydraulic cylinder 4 retracts, it can drive the locking pin support plate 2 to descend relative to the edge of the saddle connecting plate 13. At this time, the locking pin 3 is also driven to rotate out of the notch. Due to its own gravity, the locking pin 3 will slide the sliding plate 32 on the locking pin support plate 2 to the lowest position. At this time, the compression spring 33 installed between the second connecting arm 322 of the locking pin 3 and the sliding plate 32 can also play a buffering role for the locking pin 3.

[0053] Furthermore, the position sensor 6 is disposed between the locking pin 3 and the second connecting arm 322, and the position sensor 6 can detect the change in the distance between the locking pin 3 and the second connecting arm 322.

[0054] The position sensor 6 can be set between the locking pin 3 and the second connecting arm 322 to measure the gap between them. In turn, the position sensor 6 can detect the change in the distance between the locking pin 3 and the second connecting arm 322, thereby indirectly reflecting the displacement of the pin lock relative to the pin lock support plate after being abutted by the trailer pin shaft.

[0055] Furthermore, the locking status detection device also includes a drive stroke sensor, which can detect the travel position of the drive unit and is electrically connected to the tractor control unit.

[0056] As the locking pin support plate 2 rotates to the point where the locking pin 3 disengages from the notch, the locking pin 3 will slide downwards due to gravity, causing the compression spring 33 to be in a compressed state. The position sensor 6 between the locking pin 3 and the second connecting arm 322 detects the change in distance and sends the detection signal to the tractor control unit, causing it to make a misjudgment, that is, to mistakenly believe that the trailer pin is about to disengage from the saddle.

[0057] Therefore, the detection signal that the locking pin 3 is in the notch needs to be used as a prerequisite for judgment. At this time, the drive stroke sensor can detect the stroke position of the drive device, that is, the stroke position of the cylinder 4. If the extension end of the cylinder 4 is detected to be extended to the limit position, it can be said that the locking pin 3 is in the notch. At this time, the position sensor 6 between the locking pin 3 and the second connecting arm 322 detects the change in distance, which can confirm that the trailer pin shaft has come off the U-shaped plate 12.

[0058] This application also provides a tractor unit, including a tractor unit safety detection device, a tractor unit control unit, and a tractor unit power unit, wherein the tractor unit control unit is electrically connected to the tractor unit power unit.

[0059] This application also provides a method for detecting the safety of a tractor unit, including a tractor unit. The tractor unit control unit can determine the locking status of the trailer pin and saddle based on the detection signal of the locking status detection device, and can decide whether to control the tractor unit power unit to brake and decelerate based on the locking status.

[0060] The tractor safety detection method provided in this application specifically involves the tractor control unit determining whether the tractor and trailer have become uncoupled based on the detection signal from the locking status detection device.

[0061] Specifically, the drive stroke sensor determines whether the locking pin 3 is within the notch;

[0062] Position sensor 6 determines whether the locking pin 3 has been displaced relative to the second connecting arm 322;

[0063] Both send detection signals to the tractor control unit. After judging based on the detection signals, if a disengagement occurs, the tractor control unit can send a braking deceleration signal to the tractor power unit of the tractor that has disengaged, such as by limiting the torque of the tractor power unit to brake and decelerate it, to further prevent vehicle accidents.

[0064] Of course, the tractor control unit can also send signals to the corresponding alarm devices at the same time, so that the alarm devices can remind the driver to take appropriate actions.

[0065] Example 1

[0066] like Figure 1-4 As shown, the saddle and saddle connecting plate 13 are both mounted on the frame. The bottom of the hydraulic cylinder 4 is mounted on the frame via the hydraulic cylinder base 5. The telescopic end of the top of the hydraulic cylinder 4 is fixedly connected to the bottom of the locking pin support plate 2.

[0067] The locking pin support plate 2 is connected to the saddle connecting plate 13 via a hinge 21, allowing the locking pin support plate 2 to rotate via the hinge 21; the sliding plate 32 and the locking pin support plate 2 are connected by bolts 34 and nuts 35, and the sliding plate 32 can slide freely within the groove of the locking pin support plate 2.

[0068] The sliding plate 32 and the locking pin 3 are connected by a pin to form a whole; a compression spring 33 is installed between the locking pin 3 and the sliding plate 32 to provide a buffering effect; the locking pin 3 and the locking pin support plate 2 are connected by a tension spring 31; so that the locking pin 3 and the sliding plate move along the locking pin support plate 2.

[0069] The hydraulic cylinder 4 is connected to the hydraulic cylinder base 5 and the locking pin support plate 2, so that the locking pin support plate 2 can rotate around the hinge 21 through the extension and retraction of the hydraulic cylinder 4.

[0070] Working state: When the trailer pin slides into the center hole through the notch of the saddle and is locked with the U-shaped plate 12, the tractor control unit of the whole vehicle controls the extension end of the hydraulic cylinder 4 to extend. At this time, the locking pin support plate 2 rotates around the hinge 21 to a position flush with the saddle connecting plate 13 as the hydraulic cylinder 4 extends. After the hydraulic cylinder 4 is in place, the locking pin 3 and the sliding plate 32 move along the locking pin support plate 2 under the action of the tension spring 31 and the compression spring 33. After reaching the limit position, the hook at the front end of the locking pin 3 will be located on the side of the limiting protrusion 131 on the saddle base plate near the center hole, forming a mechanical lock. In this state, if the trailer is not completely locked with the saddle, the trailer pin abuts against the end face of the locking pin 3. At this time, the hook at the front end of the locking pin 3 will abut against the limiting protrusion 131 and form a secondary protection to prevent the trailer from directly disengaging from the tractor and causing a safety accident.

[0071] Simultaneously, when the locking pin 3 forms secondary protection, the gap between the locking pin 3 and the second connecting arm 322 decreases. The position sensor 6 detects this decrease in gap between the second connecting arm 322 and the locking pin 3 and feeds this information back to the tractor control unit. The tractor control unit then controls the torque limiting of the towing vehicle, and the instrument panel issues a warning, reminding the driver to check the locking status of the saddle. Of course, the torque limiting by the tractor control unit is based on two conditions: the feedback signal from the drive stroke sensor and the feedback signal from the position sensor 6. Both are indispensable.

[0072] Unlocked state: When the trailer is unlocked from the saddle, the hydraulic cylinder 4 is first retracted by the tractor control unit. As the hydraulic cylinder 4 retracts, the locking pin support plate 2 rotates around the hinge 21. After the hydraulic cylinder 4 is in position, the locking pin 3 and the sliding plate 32 slide down along the groove of the locking pin support plate 2 under the action of gravity, reaching the bottom of the locking pin support plate 2, so that the trailer is successfully unlocked from the saddle.

[0073] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0074] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the word “or” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0075] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled or recombined. These disassemblies or recombinations should be considered as equivalent solutions of this application.

[0076] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0077] It should be understood that the qualifying terms “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0078] The above description has been given for illustrative and descriptive purposes. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A tractor safety detection device, characterized in that, include: A secondary locking structure is provided, which can prevent the trailer pin from coming out of the saddle of the tractor. When the trailer pin tends to come out of the saddle, it can abut against the secondary locking structure and cause the secondary locking structure to move. The locking state detection device can detect the displacement of the secondary locking structure and send the detection signal to the tractor control unit. The saddle includes a saddle body, which has a central hole and a notch communicating with the central hole. The trailer pin can slide from the notch to the central hole and can lock with a U-shaped plate below the central hole. The secondary locking structure includes a limiting protrusion, a locking pin, and a locking pin support plate. The limiting protrusion is fixedly mounted on a saddle connecting plate below the saddle. The locking pin support plate is hinged to the saddle connecting plate, and the locking pin is movably connected to the locking pin support plate. A driving device is connected to the locking pin support plate, which can drive the locking pin support plate to rotate relative to the saddle connecting plate and cause the locking pin to screw in and out of the notch. The driving device is electrically connected to the tractor control unit. When the locking pin is screwed into the notch, the locking pin abuts against the limiting protrusion and locks itself. The limiting protrusion can restrict the radial displacement of the locking pin away from the central hole.

2. The tractor safety detection device according to claim 1, characterized in that, The locking pin is slidably connected to the locking pin support plate and can slide between the end of the locking pin support plate that is hinged to the saddle connecting plate and the end that is away from the saddle connecting plate; a tension spring is also provided between the locking pin and the locking pin support plate, one end of the tension spring is connected to the locking pin, and the other end of the tension spring is connected to the end of the locking pin support plate that is hinged to the saddle connecting plate. When the trailer pin is locked to the U-shaped plate, there is a gap between the locking pin screwed into the notch and the limiting protrusion, and the tension spring is in a free state; when the trailer pin comes out of the U-shaped plate and abuts against the locking pin, the locking pin abuts against the limiting protrusion and the tension spring is in a stretched state.

3. The tractor safety detection device according to claim 2, characterized in that, The locking state detection device includes a position sensor, which can detect the displacement of the locking pin relative to the locking pin support plate. The position sensor is electrically connected to the tractor control unit.

4. The tractor safety detection device according to claim 3, characterized in that, A sliding plate is provided between the locking pin and the locking pin support plate. The sliding plate includes a first connecting arm and a second connecting arm. The bottom of the locking pin is slidably connected to the locking pin support plate through the first connecting arm. A compression spring is installed between the end face of the locking pin away from the hinge end of the locking pin support plate and the saddle connecting plate and the second connecting arm of the sliding plate. When the trailer pin is disengaged from the U-shaped plate and abuts against the locking pin, the compression spring is in a compressed state.

5. The tractor safety detection device according to claim 4, characterized in that, The position sensor is disposed between the locking pin and the second connecting arm, and the position sensor can detect changes in the distance between the locking pin and the second connecting arm.

6. The tractor safety detection device according to claim 5, characterized in that, The locking state detection device also includes a drive stroke sensor, which can detect the travel position of the drive device and is electrically connected to the tractor control unit.

7. A tractor unit, characterized in that, The device includes a tractor safety detection device as described in any one of claims 1-6, and further includes the tractor control unit and the tractor power unit, wherein the tractor control unit is electrically connected to the tractor power unit.

8. A method for safety inspection of a tractor unit, characterized in that, Including the tractor unit as described in claim 7, the tractor unit control unit can determine the locking status of the trailer pin and the saddle based on the detection signal of the locking status detection device, and can decide whether to control the tractor power unit to brake and decelerate based on the locking status.

Images