Automatic locking device for a loader frame

Abstract

The application discloses a kind of automatic locking device of frame of loader, and the rear frame and the front frame of loader are equipped with lug seat, and the lug seat on the rear frame is connected with the lug seat on the front frame by fixed link, and the automatic locking device of frame includes: first box, second box, first box and second box are installed on the rear frame and the front frame of loader respectively, and locking mechanism for locking the one end of fixed link is equipped in second box;Swing mechanism for controlling the swing of fixed link, locking drive mechanism for controlling the work of locking mechanism are equipped in first box, one end of fixed link is installed on the lug seat of rear frame by pivot and bearing seat, fixed link is fixedly connected with pivot, so that pivot can drive fixed link to swing, and pivot is connected with swing mechanism;Locking mechanism in second box is driven by locking drive mechanism and cooperated with the lug seat of front frame, and the end of fixed link swinging to the lug seat of front frame is locked, to realize the automatic locking of rear frame and front frame of loader.

Description

Technical Field

[0001] This invention relates to the field of loader technology, and more specifically to an automatic locking device for the frame of a loader. Background Technology

[0002] Currently, locking the front and rear frames of loaders is done manually by the driver rotating a fixing rod to the front frame lug and inserting a pin. This is not only cumbersome and time-consuming for the driver, but also gets their hands dirty. This invention proposes an automatic frame locking device for loaders. The driver only needs to press a button to automatically lock the frame, improving locking efficiency and avoiding getting the driver's hands dirty, thus greatly improving the driver's driving experience. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention provides an automatic locking device for the frame of a loader. One end of a fixed rod is mounted on the lug of the rear frame via a rotating shaft and a bearing seat. The fixed rod is fixedly connected to the rotating shaft, enabling the rotating shaft to drive the fixed rod to swing. The rotating shaft is connected to a swing mechanism. By setting a swing mechanism for controlling the swing of the fixed rod and a locking drive mechanism for controlling the operation of the locking mechanism, the automatic locking of the front and rear frames is achieved.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: an automatic locking device for the frame of a loader, wherein the rear frame and the front frame of the loader are provided with lugs, and the lugs on the rear frame and the lugs on the front frame are connected by a fixing rod, and the fixing rod is provided with mounting holes at both ends. The automatic locking device for the frame includes: a first housing and a second housing, the first housing and the second housing are respectively installed on the rear frame and the front frame of the loader, such that the lugs on the rear frame and the lugs on the front frame are respectively located in the first housing and the second housing; The second housing is equipped with a locking mechanism for locking one end of the fixing rod; The first housing is equipped with a swing mechanism for controlling the swing of the fixed rod and a locking drive mechanism for controlling the operation of the locking mechanism. One end of the fixed rod is mounted on the lug of the rear frame through a rotating shaft and a bearing seat. The fixed rod is fixedly connected to the rotating shaft, so that the rotating shaft can drive the fixed rod to swing. The rotating shaft is connected to the swing mechanism. The swing mechanism drives the rotating shaft to rotate, which in turn drives the fixed rod to swing. The locking drive mechanism drives the locking mechanism in the second housing to cooperate with the front frame lug, locking the end of the fixed rod that has swung to the front frame lug, thus realizing the automatic locking of the loader's rear frame and front frame.

[0005] Furthermore, the first housing is provided with a locking mechanism and a guide plate for locking one end of the fixing rod, and the rear frame is provided with an ear seat for cooperating with the locking mechanism of the first housing. The guide plate is fixed in the first housing and located above the ear seat that cooperates with the locking mechanism of the first housing. The end of the fixing rod is locked by the locking mechanism and the ear seat that cooperates with the locking mechanism of the first housing, thus fixing the end of the fixing rod.

[0006] Furthermore, the locking mechanism is a locking pin.

[0007] Furthermore, the locking drive mechanism includes: a second motor, a second motor mounting plate, a first pulley, a second pulley, a third pulley, a pulley mounting shaft, wire grooves, limiting plates, and traction ropes. The second motor is mounted in the first housing via the second motor mounting plate. The first pulley is mounted on the second motor. The first pulley is connected to the locking pins in the first and second housings respectively via two traction ropes. The second and third pulleys are respectively positioned above the locking pins of the first and second housings via the pulley mounting shaft to change the direction of the traction ropes. The two limiting plates are positioned between the second pulley and the locking pin, and between the third pulley and the locking pin, to limit the traction ropes. Multiple wire grooves are positioned below the traction ropes for guiding them.

[0008] Furthermore, the locking drive mechanism also includes: a first photoelectric sensor and a second photoelectric sensor. The first photoelectric sensor is disposed at the lug below the guide plate and is used to detect whether the fixing rod and the lug below the guide plate have reached the locking position. The second photoelectric sensor is disposed in the lug of the front frame and is used to detect whether the fixing rod has reached the locking position in the lug of the front frame.

[0009] Furthermore, the swing mechanism adopts a synchronous belt drive mechanism, which includes: a driving pulley, a driven pulley, a synchronous belt, a first motor, and a first motor mounting plate. The driven pulley is mounted on the rotating shaft, and the first motor is mounted in the first housing through the first motor mounting plate. The driving pulley is mounted on the first motor, and the synchronous belt is mounted on the driving pulley and the driven pulley, enabling them to move together. The first motor drives the rotating shaft to rotate, thereby controlling the swing range of the fixed rod.

[0010] Furthermore, the first and second housings are provided with openings for the fixed rod to swing in.

[0011] Furthermore, the sides of the first and second housings have round holes for installing traction ropes, and rubber sleeves are provided on the round holes.

[0012] The beneficial effects of this invention are: This invention relates to an automatic frame locking device for loaders, which can automatically lock the front and rear frames of the loader with one button, improving the driver's driving experience. This invention relates to an automatic locking device for the frame of a loader. It is driven by a motor, with synchronous belt transmission and pulley cooperation to achieve automatic locking of the front and rear frames. The automatic locking device is equipped with a housing, with only some fixing rods exposed, providing good protection and a long service life. This invention relates to an automatic locking device for the frame of a loader. It is installed on the front and rear frames only by bolts. It has a compact structure, occupies little space, is easy to install and disassemble, and is convenient for later maintenance and replacement. It is also suitable for the existing structure of the loader, and can be installed simply by drilling threaded holes in the frame. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the automatic locking device for the loader's chassis. Figure 2 This is a schematic diagram of the internal structure of the first box. Figure 3 for Figure 2 Enlarged view of a part Figure 1 ; Figure 4 for Figure 3 A partial diagram of the exploded structure; Figure 5 for Figure 2 Enlarged view of a part Figure 2 ; Figure 6 for Figure 5 Partial explosion illustration Figure 2 ; Figure 7 This is a schematic diagram of the internal structure of the second box. Figure 8 for Figure 7 Schematic diagram of a partial structure; Figure 9 This is a schematic diagram showing the loader when the front and rear vehicles are fixed in place. Figure 10 This is a schematic diagram showing the state of the loader when the front and rear vehicles are not fixed. Figure 11 This is the control flowchart when the front and rear vehicles of the loader are fixed. In the diagram: 1. First housing; 101. First protective cover; 102. First base plate; 103. Drive pulley; 104. Bearing housing; 105. Rotating shaft; 106. Flat key; 107. Fixing rod; 108. First motor; 109. Coupling; 110. Drive shaft; 111. Synchronous belt; 112. Second motor; 113. First motor mounting plate; 114. Second motor mounting plate; 115. First pulley; 116. First pulley bearing; 117. First pulley mounting shaft; 118. Second pulley; 119. Second pulley bearing; 120. Second pulley Mounting shaft; 121, second guide rail groove; 122, first guide rail groove; 123, first limiting plate; 124, first locking pin; 125, guide plate; 126, first traction rope; 127, second traction rope; 128, rubber sleeve; 129, first photoelectric sensor; 130, driven pulley; 2, second housing; 201, second protective cover; 202, second base plate; 203, third pulley mounting shaft; 204, third pulley; 205, third pulley bearing; 206, second locking pin; 207, second photoelectric sensor; 208, second limiting plate. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0015] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0016] like Figure 1-8 As shown, an automatic locking device for the frame of a loader is provided. The rear frame and the left side beam plate of the front frame of the loader are provided with lugs. The lugs on the rear frame and the lugs on the front frame are connected by a fixing rod 107. The fixing rod 107 has mounting holes at both ends. The automatic locking device for the frame includes: a first housing 1 and a second housing 2. The first housing 1 and the second housing 2 are respectively installed on the left side beam plates of the rear frame and the front frame of the loader, so that the lugs on the rear frame and the lugs on the front frame are located in the first housing 1 and the second housing 2, respectively. The second housing 2 is provided with a locking mechanism for locking one end of the fixing rod 107; The first housing 1 is provided with a swing mechanism for controlling the swing of the fixed rod 107 and a locking drive mechanism for controlling the operation of the locking mechanism. One end of the fixed rod 107 is mounted on the ear seat of the rear frame through a rotating shaft 105 and a bearing seat 104. The fixed rod 107 is fixedly connected to the rotating shaft 105, so that the rotating shaft 105 can drive the fixed rod 107 to swing. The rotating shaft 105 is connected to the swing mechanism. The swing mechanism drives the rotating shaft 105 to rotate, which in turn drives the fixed rod 107 to swing. The locking drive mechanism drives the locking mechanism in the second housing 2 to cooperate with the front frame lug, locking the end of the fixed rod 107 that has swung to the front frame lug, thereby realizing the automatic locking of the rear frame and the front frame of the loader.

[0017] like Figure 2 As shown, the first housing 1 includes: a first protective cover 101 and a first bottom plate 102. The first bottom plate 102 is bolted to the left side beam of the rear frame. The first protective cover 101 is mounted on the first bottom plate 102 and fixed with bolts. Figure 7 As shown, the second housing 2 includes: a second protective cover 201 and a second bottom plate 202. The second bottom plate 202 is bolted to the left side beam of the front frame, and the second protective cover 201 is mounted on the second bottom plate 202 and fixed with bolts.

[0018] like Figure 2-6 As shown, the swing mechanism adopts a synchronous belt drive mechanism, which includes: a driving pulley 103, a driven pulley 130, a synchronous belt 111, a first motor 108, and a first motor mounting plate 113. The driven pulley 130 is mounted on the rotating shaft 105, and the first motor 108 is mounted on the first base plate 102 through the first motor mounting plate 113. The driving pulley 103 is mounted on the first motor 108, and the synchronous belt 111 is mounted on the driving pulley 103 and the driven pulley 130, enabling them to move together. The synchronous belt 111 transmits the torque output by the first motor 108 to the rotating shaft 105, controlling the swing range of the fixed rod 107.

[0019] like Figure 5 As shown, the output shaft of the first motor 108 is connected to the drive pulley 103 via a coupling 109 and a transmission shaft 110.

[0020] The top of the rotating shaft 105 is fixedly connected to the driven pulley 130, the bearing housing 104 is fixedly connected to the lug on the rear frame, the bearing housing 104 contains a bearing, and the fixed rod 107 is fixedly connected to the rotating shaft 105 by a flat key 106, which enhances the stability of the connection. When the driving pulley 103 rotates, the rotating shaft 105 and the fixed rod 107 rotate accordingly.

[0021] like Figure 2 As shown, the loader's rear frame has two lugs on the left side beam, such as... Figure 4As shown, a device is used to connect to the fixed rod 107 via a rotating shaft 105 and a bearing housing 104, such as... Figure 5 , 6 As shown, another locking mechanism is used to cooperate with the locking mechanism in the first housing 1 to fix the end of the fixing rod 107 in the first housing 1. An ear seat is provided on the left side beam of the front frame to cooperate with the locking mechanism in the second housing 2 to fix the end of the fixing rod 107 in the second housing 2.

[0022] like Figure 5-6 As shown, the first housing 1 is provided with a locking mechanism for locking one end of the fixing rod 107 and a guide plate 125. The rear frame is provided with an ear seat for cooperating with the locking mechanism of the first housing 1. The guide plate 125 is fixed in the first housing 1 and located above the ear seat that cooperates with the locking mechanism of the first housing 1. The end of the fixing rod 107 is locked by the locking mechanism and the ear seat that cooperates with the locking mechanism of the first housing 1, thus fixing the end of the fixing rod 107.

[0023] The locking mechanism is a locking pin, with the first locking pin 124 located in the first housing 1 and the second locking pin 206 located in the second housing 2.

[0024] like Figure 2 , 4As shown in Figures 5, 6, 7, and 8, the locking drive mechanism includes: a second motor 112, a second motor 112 mounting plate 114, a first pulley 115, a second pulley 118, a third pulley 204, a first pulley mounting shaft 117, a second pulley mounting shaft 120, a third pulley mounting shaft 203, a first guide rail 122, a second guide rail 121, a first limiting plate 123, a second limiting plate 208, a first traction rope 126, and a second traction rope 127. The second motor 112 is connected to the second motor 112 mounting plate. 114 is installed on the first base plate 102 in the first housing 1. The first pulley 115 is installed on the second motor 112. The first pulley 115 is a double-rail pulley, and the second pulley 118 and the third pulley 204 are single-rail pulleys. The first pulley 115 is connected to the first locking pin 124 and the second locking pin 206 via the first traction rope 126 and the second traction rope 127, respectively. The second pulley 118 is installed above the first locking pin 124 via the second pulley mounting shaft 120, and is used to change the direction of the first traction rope 126, so that the first... A locking pin 124 moves up and down in the guide plate 125. A third pulley 204 is mounted above the second locking pin 206 via a third pulley mounting shaft 203, changing the direction of the second traction rope 127. A first limiting plate 123 is installed between the second pulley 118 and the first locking pin 124 in the first housing 1, so that the first traction rope 126 is located in the notch of the first limiting plate 123, limiting the first traction rope 126. A second limiting plate 208 is installed in the second housing 2, which is connected to the third pulley 204 and the second locking pin 206. Between the pins 206, the second traction rope 127 is positioned in the notch of the second limiting plate 208, thus limiting the second traction rope 127. A first guide groove 122 and multiple second guide grooves 121 are provided below the traction rope to control its position. The first guide groove 122 guides the first traction rope 126 and the second traction rope 127, and the multiple second guide grooves 121 guide the second traction rope 127 to prevent the locking pin from repeatedly rising and falling, which could cause the traction rope to deviate and disengage from the pulley.

[0025] A first pulley bearing 116 is provided between the first pulley 115 and the first pulley mounting shaft 117, a second pulley bearing 119 is provided between the second pulley 118 and the second pulley mounting shaft 120, and a third pulley bearing 205 is provided between the third pulley 204 and the third pulley mounting shaft 203 to ensure the smoothness of the roller rotation.

[0026] The locking drive mechanism described above can simultaneously control the operation of the locking mechanism.

[0027] When the second motor 112 rotates, the first pulley 115 rotates. The first locking pin 124 and the second locking pin 206 become longer or shorter under the influence of the pulley through the first traction rope 126 and the second traction rope 127, respectively, thereby driving the first locking pin 124 and the second locking pin 206 to rise or fall. Since the radii of the double tracks in the first pulley 115 are exactly the same, it can be ensured that the first locking pin 124 and the second locking pin 206 rise or fall synchronously, and the height of rise or fall is exactly the same.

[0028] When the first locking pin 124 reaches its highest position, the second motor 112 will stop rotating. At this time, a section of the tail of the first locking pin 124 is still inside the hole of the guide plate 125. At this time, the first limiting plate 123 plays a limiting role to prevent the first locking pin 124 from continuing to rise and hitting the second pulley 118, which would damage the device. When the first locking pin 124 descends, the first locking pin 124 locks the fixing rod 107 through the mounting hole of the fixing rod 107 and the ear seat. Under the action of the guide plate 125, it is ensured that the first locking pin 124 will not deviate from its trajectory and can lock the fixing rod 107.

[0029] The first protective cover 101 and the second protective cover 201 have round holes on their sides. The second traction rope 127 of the second locking pin 206 passes through the round hole and is fixedly connected to the first pulley 115. The second guide groove 121 is used to guide the traction rope to prevent the traction rope from deviating and disengaging from the pulley due to repeated rising and falling of the second locking pin 206 shaft. Rubber sleeves are installed in the round holes of the first protective cover 101 and the second protective cover 201. The function of the rubber sleeves is to prevent the second traction rope 127 from wearing and breaking due to long-term friction with the box.

[0030] like Figure 9 As shown, the loader is in a state where the front and rear vehicles are not fixed. At this time, the fixing rod 107 is locked inside the first housing 1, and the first locking pin 124 and the second locking pin 206 both pass through the lugs on the frame. like Figure 10 As shown, this is the state when the loader is fixed at the rear. At this time, one end of the fixing rod 107 is located inside the second housing 2 and is in a locked state. The first locking pin 124 and the second locking pin 206 both pass through the lugs on the frame.

[0031] like Figure 6 , 8 As shown, the locking drive mechanism also includes a first photoelectric sensor 129 and a second photoelectric sensor 207. The first photoelectric sensor 129 is located at the lug below the guide plate 125 and is used to detect whether the fixing rod 107 and the lug below the guide plate 125 have reached the locking position. The second photoelectric sensor 207 is located in the lug of the front frame and is used to detect whether the fixing rod 107 has reached the locking position in the lug of the front frame.

[0032] The first protective cover 101 of the first housing 1 and the second protective cover 201 of the second housing 2 are provided with openings for the fixed rod 107 to swing in, so that the fixed rod 107 can swing. Only part of the fixed rod 107 is exposed outside the second housing 2 of the first housing 1, which has good protection performance and long service life.

[0033] The first motor 108, the second motor 112, the first photoelectric sensor 129, and the second photoelectric sensor 207 are all connected to the vehicle controller. The vehicle controller is externally connected to a locking button and a disengaging button. The first motor 108 and the second motor 112 are servo motors or motors with encoders.

[0034] like Figure 11 As shown, the control method for connecting the front and rear frames of the loader's automatic frame locking device is as follows: S1: The driver presses the locking button; S2: The vehicle controller obtains the loader's steering angle and determines whether it is less than the set range value. If the loader's steering angle is too large or too small, the mounting hole of the fixing rod 107 will not be aligned with the mounting hole of the front frame lug, thus failing to lock. Therefore, when the steering angle is within the set range value, it jumps to S4, and when the steering angle is within the set range value, it jumps to S3. S3: Adjust the loader's rotation angle to the set value; S4: The second motor 112 starts to rotate, causing the first pulley 115 to wind the first traction rope 126 and the second traction rope 127, which drives the first locking pin 124 and the second locking pin 206 to rise. When the first locking pin 124 rises to the highest position, the second motor 112 stops rotating. S5: After the second motor 112 stops rotating, the fixing rod 107 is in an unlocked state. The first motor 108 starts to rotate forward and drives the fixing rod 107 to rotate through the synchronous belt 111, so that the end of the fixing rod 107 rotates towards the second housing 2. S6: When the second photoelectric sensor 207 senses the fixed rod 107, turn to S7; otherwise, turn to S6. S7: When the rotation speed of the first motor 108 is within the preset range, turn to S7; otherwise, turn to S6. S8: The first motor 108 stops rotating, the second motor 112 rotates, causing the first pulley 115 to release the first traction rope 126 and the second traction rope 127 that are wrapped around it. The first locking pin 124 and the second locking pin 206 descend to lock the fixing rod 107. The second motor 112 stops rotating, realizing the automatic connection between the front and rear vehicle bodies.

[0035] The control method for separating the front and rear frames of the loader's automatic frame locking device is as follows: S1: The driver presses the disengagement button; S2: The vehicle controller obtains the loader's steering angle and determines whether it is less than the set range value. If the loader's steering angle is too large or too small, the mounting hole of the fixing rod 107 and the locking shaft in the mounting hole of the front frame ear seat will not be able to disengage effectively. Therefore, when the steering angle is within the set range value, it jumps to S4; when the steering angle is within the set range value, it jumps to S3. S3: Adjust the loader's rotation angle to the set value; S4: The second motor 112 starts to rotate, causing the first pulley 115 to wind the first traction rope 126 and the second traction rope 127. The first locking pin 124 and the second locking pin 206 rise. When the first locking pin 124 rises to the highest position, the second motor 112 stops rotating. S5: After the second motor 112 stops rotating, the fixed rod 107 is in an unlocked state. The first motor 108 starts to reverse and drives the fixed rod 107 to rotate through the synchronous belt 111, so that the end of the fixed rod 107 is away from the second housing 2. S6: When the first photoelectric sensor 129 senses the fixed rod 107, proceed to S7; otherwise, proceed to S6. S7: When the rotation speed of the first motor 108 is within the preset range, turn to S7; otherwise, turn to S6. S8: The first motor 108 stops rotating, the second motor 112 rotates, causing the first pulley 115 to release the wound first traction rope 126 and second traction rope 127. The first locking pin 124 and the second locking pin 124 descend to lock the fixing rod 107. The second motor 112 stops rotating, and at this time the fixing rod 107 is fixed in the first housing 1.

[0036] 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 or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic locking device for the frame of a loader, wherein both the rear and front frames of the loader are provided with lugs, the lugs on the rear frame and the lugs on the front frame are connected by a fixing rod, and the fixing rod has mounting holes at both ends, characterized in that, The automatic locking device for the frame includes: a first housing and a second housing, the first housing and the second housing being respectively installed on the rear frame and the front frame of the loader, such that the lugs on the rear frame and the lugs on the front frame are respectively located in the first housing and the second housing; The second housing is equipped with a locking mechanism for locking one end of the fixing rod; The first housing is equipped with a swing mechanism for controlling the swing of the fixed rod and a locking drive mechanism for controlling the operation of the locking mechanism. One end of the fixed rod is mounted on the lug of the rear frame through a rotating shaft and a bearing seat. The fixed rod is fixedly connected to the rotating shaft, so that the rotating shaft can drive the fixed rod to swing. The rotating shaft is connected to the swing mechanism. The swing mechanism drives the rotating shaft to rotate, which in turn drives the fixed rod to swing. The locking drive mechanism drives the locking mechanism in the second housing to cooperate with the front frame lug, locking the end of the fixed rod that swings to the front frame lug, thus realizing the automatic locking of the loader's rear frame and front frame. The first housing is provided with a locking mechanism and a guide plate for locking one end of the fixing rod. The rear frame is provided with an ear seat for cooperating with the locking mechanism of the first housing. The guide plate is fixed in the first housing and located above the ear seat that cooperates with the locking mechanism of the first housing. The end of the fixing rod is locked by the locking mechanism and the ear seat that cooperates with the locking mechanism of the first housing, thus fixing the end of the fixing rod. The locking mechanism is a locking pin; The locking drive mechanism includes: a second motor, a second motor mounting plate, a first pulley, a second pulley, a third pulley, a pulley mounting shaft, wire grooves, limiting plates, and traction ropes. The second motor is mounted in the first housing via the second motor mounting plate. The first pulley is mounted on the second motor. The first pulley is connected to locking pins in the first and second housings via two traction ropes, respectively. The second and third pulleys are respectively positioned above the locking pins of the first and second housings via the pulley mounting shaft to change the direction of the traction ropes. The two limiting plates are positioned between the second pulley and the locking pin, and between the third pulley and the locking pin, to limit the traction ropes. Multiple wire grooves are positioned below the traction ropes for guiding them.

2. The automatic locking device for the frame of a loader according to claim 1, characterized in that: The locking drive mechanism further includes: a first photoelectric sensor and a second photoelectric sensor. The first photoelectric sensor is disposed at the lug below the guide plate and is used to detect whether the fixing rod and the lug below the guide plate have reached the locking position. The second photoelectric sensor is disposed in the lug of the front frame and is used to detect whether the fixing rod has reached the locking position in the lug of the front frame.

3. The automatic locking device for the frame of a loader according to claim 1, characterized in that: The swing mechanism adopts a synchronous belt drive mechanism, which includes: a driving pulley, a driven pulley, a synchronous belt, a first motor, and a first motor mounting plate. The driven pulley is mounted on the rotating shaft, and the first motor is mounted in the first housing through the first motor mounting plate. The driving pulley is mounted on the first motor, and the synchronous belt is mounted on the driving pulley and the driven pulley, enabling them to move together. The first motor drives the rotating shaft to rotate, thereby controlling the swing range of the fixed rod.

4. The automatic locking device for the frame of a loader according to claim 1, characterized in that: The first and second boxes are provided with openings for the fixed rod to swing in.

5. The automatic locking device for the frame of a loader according to claim 1, characterized in that: The sides of the first and second housings have round holes for installing traction ropes, and rubber sleeves are provided on the round holes.

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