Self-locking propeller and its locking control method

Abstract

This invention relates to a self-locking pusher and its locking method. The pusher includes: a track with a locking slot at its rear end; a push block mounted on the track, capable of sliding back and forth on the track, and automatically engaging with the locking slot when pushed backward to the rear end of the track by a forward pulling force from a pull-driven component, and disengaging from the locking slot to release the lock when pushed backward by goods; and a pull-driven component connecting the front end of the push block and the track, used to apply a forward pulling force to the push block after it disengages from the locking slot. During restocking, the pusher self-locks by pushing the push block to the rear end of the track, and unlocks by the backward push of goods after restocking. Then, the goods are pushed forward by the pulling force of the pull-driven component. Throughout the process, the operator only needs to push the push block once, achieving automatic locking and unlocking of the pusher, making restocking easy, improving restocking efficiency and ease of use.

Description

Technical Field

[0001] This invention belongs to the technical field of product display equipment, and specifically relates to a self-locking pusher and its locking control method. Background Technology

[0002] Currently, in the retail, warehousing and logistics sectors, pushers (also known as pushers or trolleys) are widely used to automatically push goods (such as bottled beverages, canned food, boxed daily necessities, etc.) displayed on shelves, display cases or in aisles forward to keep the goods at the front of the shelf for easy access by customers.

[0003] However, the applicant found that existing pushers typically consist of a track, a push block that slides along the track, and a coil spring connecting the push block and the front end of the track. During restocking, the operator needs one hand to push the push block backward to the rear end of the track while using the other hand to replenish the goods. This restocking operation is cumbersome, laborious, and inefficient. To solve this problem, some pushers add an additional hook assembly to the push block. This hook assembly is manually engaged to hook onto the rear end of the track or equipment to lock the push block at the rear end of the track. This process usually requires both hands, and once the goods are replenished, the operator needs to reach to the track end to manually release the hook assembly and unlock it, which is also difficult. The locking and unlocking operations of this type of pusher are tedious, laborious, and difficult, significantly reducing ease of use and user experience. Furthermore, the additional hook assembly complicates the push block structure, increases its size, and raises costs. Summary of the Invention

[0004] To address one of the aforementioned problems in the prior art, the present invention provides a self-locking thruster and its locking control method.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: In a first aspect, the present invention provides a self-locking thruster, comprising: The track has a locking mechanism at its rear end; The push block is mounted on the track and can slide back and forth on the track. When pushed backward to the rear end of the track, it can automatically engage with the locking position by the forward pulling force of the pull drive component. When pushed backward by the product, it can disengage from the locking position to release the lock. A tension drive, connecting the front end of the propulsion block and the track, is used to apply a forward tension force to the propulsion block after the propulsion block disengages from the locking position.

[0006] In this invention, the assembly point between the propulsion block and the track has at least one set of guide support parts. Each set of guide support parts includes a first guide support part, a second guide support part, a third guide support part, and a fourth guide support part. The contact combination between the guide support parts and the track is different in different working states of the propulsion block.

[0007] In this invention, the first guide support and the second guide support are located on opposite sides of the front end of the assembly point between the propulsion block and the track, and the third guide support and the fourth guide support are located on opposite sides of the rear end of the assembly point between the propulsion block and the track.

[0008] In this invention, the propulsion block and the track are assembled and connected by a sliding plate and a sliding groove structure. The front bottom surface and the surface of the sliding plate are respectively provided with a first guide support and a second guide support. The rear bottom surface and the surface of the sliding plate are respectively provided with a third guide support and a fourth guide support. The sliding plate is assembled in the sliding groove and can slide along the sliding groove. The width of the sliding groove is greater than the thickness of the sliding plate.

[0009] In another embodiment, the propulsion block and the track are assembled and connected by a slide block and slide rod structure. The slide block is a U-shaped or annular structure and is slidably mounted on the slide rod. The width of the U-shaped notch or the inner diameter of the annular hole of the slide block is larger than the outer diameter of the slide rod. The front end of the U-shaped notch or the annular hole of the slide block is provided with a first guide support and a second guide support on the inner side wall, respectively. The rear end of the U-shaped notch or the annular hole of the slide block is provided with a third guide support and a fourth guide support on the inner side wall, respectively.

[0010] In this invention, the tension driving component is a coil spring, which is mounted on the push block. The outer end of the coil spring extends from the bottom front end of the push block and is connected to the front end of the slide rail. In another embodiment, the tension drive component is a tension spring, with its two ends connected to the bottom front end of the push block and the front end of the slide rail, respectively. In another embodiment, the pulling drive component is a pull box, which is installed on the push block, and the pull cable of the pull box extends from the bottom front end of the push block and is connected to the front end of the slide rail.

[0011] In this invention, the propulsion block has a self-locking latch, which is used to engage with the locking position at the rear end of the track when the propulsion block is converted to the second state.

[0012] In this invention, the self-locking latch is an inverted buckle located at the rear end of the assembly point between the push block and the track, and the locking position is the rear end face of the track or a notch provided at the rear end of the track.

[0013] In another embodiment, the self-locking latch is an inverted buckle located at the rear end of the push block, and the locking position is the rear end face of the track or a crossbar located at the rear end of the track.

[0014] Secondly, the present invention also provides a locking control method for the above-mentioned self-locking thruster, comprising the following steps: The propulsion block is pushed backward along the track to the rear end of the track; The forward pulling force of the pull drive component is used to make the push block automatically engage with the locking position at the rear end of the track; The backward pushing force of the product on the push block causes the push block to disengage from the locking position and thus release the lock. After the lock is released, the forward pulling force of the pull drive component is used to propel the product forward along the track.

[0015] In this invention, the propulsion block and the track assembly have at least one set of guide support parts, each set of guide support parts including a first guide support part, a second guide support part, a third guide support part, and a fourth guide support part. The first guide support part, the second guide support part, the third guide support part, and the fourth guide support part have different contact and engagement methods with the track in multiple steps of the propulsion block.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects: This invention, through the aforementioned technical solution, allows operators to manually push the pusher block backward during replenishment. The pusher block slides along the track to the rear end and automatically engages with the locking position, achieving self-locking. Once the product is replenished, the first placed product contacts and pushes the pusher block backward, causing it to automatically disengage from the locking position and unlock. Under the pulling force of the pull drive component, the product is then propelled forward. Throughout the entire process, the operator only needs to push the pusher block once, requiring no additional operation. This achieves automatic locking and unlocking of the pusher, making replenishment easy and significantly improving replenishment efficiency and ease of use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the self-locking thruster described in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the assembly structure of the propulsion block and the tension drive component in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the contact structure between the various guide support parts of the propulsion block and the track when the propulsion block is in the first state (sliding backward state) in Embodiment 1 of the present invention. Figure 4 This is a schematic diagram of the contact structure between the guide support parts of the propulsion block and the track when the propulsion block is in the second state (self-locking state) in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the contact structure between the various guide support parts of the propulsion block and the track when the propulsion block is in the third state (unlocked state) in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the contact structure between the guide support parts of the propulsion block and the track when the propulsion block is in the fourth state (forward propulsion state) in Embodiment 1 of the present invention. Figure 7 This is a schematic diagram of the self-locking thruster described in Embodiment 2 of the present invention; Figure 8 This is a schematic diagram of the structure of the propulsion block in the third state (unlocked state) in Embodiment 2 of the present invention; Figure 9 This is a schematic diagram of the self-locking thruster described in Embodiment 3 of the present invention; Figure 10 This is a schematic diagram of the contact structure between the various guide support parts of the propulsion block and the track when the propulsion block is in the second state (self-locking state) in Embodiment 3 of the present invention.

[0018] Explanation of reference numerals in the attached figures: 100. Track; 101. Locking position; 102. Slide groove; 103. Slide rod; 200. Propulsion block; 201. First guide support; 202. Second guide support; 203. Third guide support; 204. Fourth guide support; 205. Slide plate; 206. Slide seat; 207. Self-locking latch; 208. U-shaped latch. 300. Tension drive components. Detailed Implementation

[0019] 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. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Example 1

[0020] like Figure 1-2 As shown, the self-locking thruster according to Embodiment 1 of the present invention includes a track 100, a thrust block 200, and a tension drive component 300. The track 100 is elongated and extends in the front-to-back direction, with a locking position 101 at its rear end. In this embodiment, the locking position 101 is the rear end face of the track 100, i.e., the rearmost end face of the track 100.

[0021] The push block 200 is slidably mounted on the track 100. The push block 200 is block-shaped, and its bottom is slidably connected to the track 100. The tension drive 300 connects the push block 200 and the front end of the track 100, and is used to apply a forward tension force to the push block 200 after it is disengaged from the locking position 101. In this embodiment, the tension drive 300 is a coil spring, which is mounted on the push block 200 and its outer end extends from the bottom front end of the push block 200 and is fixedly connected to the front end of the track 100. When the push block 200 slides backward, the coil spring is stretched and generates a forward restoring force. Of course, the tension drive 300 can also be a tension spring, with its two ends connected to the bottom front end of the push block 200 and the front end of the slide rail 100, respectively; the tension drive 300 can also be a pull box, which is installed on the push block 200, with the pull wire of the pull box extending from the bottom front end of the push block 200 and connected to the front end of the slide rail 100.

[0022] When the self-locking pusher described in Embodiment 1 of the present invention is used, the push block 200 can automatically engage with the locking position 101 of the track 100 by the forward pulling force of the pull drive 300 when it is pushed backward (manually) to the rear end of the track 100, and can disengage from the locking position 101 to release the lock when it is pushed backward by the product.

[0023] like Figure 3-6As shown, in Embodiment 1 of the present invention, the assembly point between the propulsion block 200 and the track 100 has at least one set of guide support parts. Each set of guide support parts includes a first guide support part 201, a second guide support part 202, a third guide support part 203, and a fourth guide support part 204. These guide support parts can be flat surfaces, or they can be structures such as protrusions, ridges, or rollers. They are used to ensure that the contact combination between the guide support parts and the track 100 is different in different working states of the propulsion block 200, and to contact different parts of the track 100, so as to achieve the control of the attitude and sliding direction of the propulsion block 200 by applying forces in coordination. In this embodiment, the first guide support 201 and the second guide support 202 are located on opposite sides of the front end of the assembly point between the push block 200 and the track 100, and the third guide support 203 and the fourth guide support 204 are located on opposite sides of the rear end of the assembly point between the push block 200 and the track 100. Specifically, the push block 200 and the track 100 are connected by a sliding plate 205 and a sliding groove 102. The bottom of the push block 200 has sliding plates 205 at opposite ends, and the front bottom surface and surface of the sliding plates 205 are respectively provided with first guide supports. The slide plate 205 has a support 201 and a second guide support 202. The bottom and surface of the rear end of the slide plate 205 are respectively provided with a third guide support 203 and a fourth guide support 204. The track 100 is provided with a guide surface that cooperates with these guide supports. The guide surface is specifically the upper and lower inner walls of the slide groove 102. The slide plate 205 is assembled in the slide groove 102 and can slide along the slide groove 102. The width of the slide groove 102 is greater than the thickness of the slide plate 205, so that the slide plate 205 can swing back and forth in the slide groove 102, thereby changing the contact combination between different guide supports and the inner wall of the slide groove 102.

[0024] The propulsion block 200 described in Embodiment 1 of the present invention has four states during operation, which will be described in detail below in conjunction with the contact and cooperation relationship of each guide support part.

[0025] First state (backward gliding state): as follows Figure 3As shown, the operator manually pushes the propulsion block 200 backward, causing it to slide from the front end to the rear end of the track 100. At this time, under the backward thrust, the propulsion block 200 slightly swings backward (attitude adjustment), causing the second guide support 202 and the third guide support 203 to contact the corresponding surfaces of the track 100, while the first guide support 201 and the fourth guide support 204 remain in a non-contact state. This contact combination provides stable backward sliding guidance for the propulsion block 200, and since the self-locking structure is not yet active, the propulsion block 200 can move backward with relatively little effort. It is worth noting that in the first state, the tension drive 300 is elongated, but its forward tension mainly acts on the front end of the propulsion block 200, while the attitude of the propulsion block 200 causes the second guide support 202 and the third guide support 203 to form stable two-point contact with the track 100.

[0026] Second state (self-locking state): such as Figure 4 As shown, when the pusher block 200 is pushed to the rear end of the track 100, the operator releases their hand or stops applying the backward pushing force. At this time, under the forward pulling force of the pull drive 300, the front end of the pusher block 200 is pulled forward, causing the pusher block 200 to undergo a slight forward swing posture change, so that the first guide support 201 contacts the corresponding surface of the track 100, while the second guide support 202, the third guide support 203, and the fourth guide support 204 are all in a non-contact state. In this posture, the self-locking latch 207 of the pusher block 200 falls into or engages with the locking position 101 at the rear end of the track 100 (specifically, the self-locking latch 207 is an undercut provided at the rear end of the pusher block 200 assembly point, and the locking position 101 is the rear end face of the track), thereby locking the pusher block 200 at the rear end of the track 100. At this time, even if the pull drive 300 continues to apply a forward pulling force, the push block 200 cannot move forward due to the engaging action of the self-locking latch 207 and the locking position 101, and remains in the rear locking position. The operator can easily place the goods (products) in front of the push block 200 without resisting the pulling force of the pull drive 300.

[0027] Third state (unlocked state): such as Figure 5 As shown, after the goods are replenished one by one, the first item placed (i.e., the item closest to the push block 200) will contact the front end face (i.e., the pushing part) of the push block 200 and apply a backward pushing force to the push block 200. Under the action of this backward pushing force, the push block 200 will undergo a slight backward swing posture change again, and all the guide supports (first to fourth) will briefly stop contacting the track 100, that is, the push block 200 will be in a relatively free state. This posture change causes the self-locking latch 207 to disengage from the locking position 101, and the push block 200 will be unlocked.

[0028] Fourth state (forward progress state): such as Figure 6 As shown, after the push block 200 is unlocked, the backward pushing force of the goods disappears (because the goods are replenished, the push block 200 is no longer subjected to a continuous backward force), and the forward pulling force of the pull drive 300 becomes dominant, causing the push block 200 to move forward. During this forward movement, the posture of the push block 200 is adjusted so that the first guide support 201 and the fourth guide support 204 are in contact with the track 100, while the second guide support 202 and the third guide support 203 are in a non-contact state. This contact combination ensures that the push block 200 can slide smoothly and stably forward along the track 100 and transmit the thrust to the goods in front, continuously pushing the goods towards the front end of the track 100.

[0029] Through the transitions between the four states described above, the self-locking pusher of this invention can sequentially achieve easy backward sliding, automatic locking, automatic unlocking after replenishment, and automatic forward propulsion during the replenishment process. Thus, when the operator manually pushes the pusher 200 backward during replenishment, the pusher 200 can easily slide along the track 100 to the rear end, where it automatically engages with the locking position 101 to achieve self-locking. When the product is replenished, the first placed product contacts and pushes the pusher 200 backward, causing the pusher 200 to automatically disengage from the locking position 101 and unlock, then propel the product forward under the pulling force of the pull drive component 300. Throughout the process, the operator only needs to push the pusher block 200 once, making restocking easy; unlocking is completed entirely by the product itself, without any additional operation, realizing automatic locking and unlocking of the pusher, greatly improving restocking efficiency and ease of use. Moreover, this self-locking pusher does not require any additional components based on existing pushers, has a simple structure, is easy to operate, and is highly versatile. It can be widely used in supermarket shelves, refrigerated display cases, vending machines, warehouse logistics sorting lines, and other occasions that require automatic product pushing.

[0030] like Figure 2-6 As shown, the propulsion block 200 of Embodiment 1 of the present invention has a self-locking latch 207, which is used to engage with the locking position 101 at the rear end of the track 100 when the propulsion block 200 is converted to the second state. The self-locking latch 207 may be a buckle located at the rear end of the assembly point between the propulsion block 200 and the track 100, and the locking position 101 may be a notch provided at the rear end of the track 100. When the propulsion block 200 is in the second state, the buckle engages with the notch at the rear end of the track 100, preventing the propulsion block 200 from sliding forward, thus automatically locking the propulsion block 200.

[0031] Of course, the locking position 101 can also be a groove provided at the rear end of the track 100. The self-locking part 207 (inverted) falls into the groove when the push block 200 swings slightly forward, so as to realize the automatic locking of the push block 200. Example 2

[0032] like Figure 7 , 8 As shown, the difference between this embodiment 2 and embodiment 1 is that the locking position 101 is the rear end face of the track 100. When the push block 200 is in the second state, the buckle just locks onto the rear end face of the track 100, preventing the push block 200 from sliding forward, thus achieving automatic locking of the push block 200. Example 3

[0033] like Figure 9 , 10 As shown, the difference between this embodiment and embodiment one is that the propulsion block 200 and the track 100 are connected by a sliding block 206 and a sliding rod 103. The track 100 has a rod-shaped structure (i.e., the sliding rod 103), and the sliding block 206 is a U-shaped structure that is slidably mounted on the sliding rod 103. The width of the U-shaped notch 208 of the sliding block 206 is greater than the outer diameter of the sliding rod 103, so that the sliding block 206 can swing at a certain angle relative to the sliding rod 103. Moreover, the front end of the U-shaped notch 208 is provided with a first guide support 201 and a second guide support 202 on the inner sidewall, and the rear end of the U-shaped notch 208 is provided with a third guide support 203 and a fourth guide support 204 on the inner sidewall. Under the action of manual backward pushing, pulling force from the pull drive 300, and backward pushing force from the product, the slide block 206 swings forward or backward relative to the slide rod 103, causing different guide supports to contact or disengage from the circumferential surface of the slide rod 103, thereby achieving four state switching. The other structures and working principles of this embodiment are the same as those of Embodiment 1, and will not be repeated here.

[0034] Of course, the slide block 206 can also be an annular structure and slidably mounted on the slide rod 103. The inner diameter of the annular hole of the slide block 206 is larger than the outer diameter of the slide rod 103, which also allows the slide block 206 to swing at a certain angle relative to the slide rod 103. The front end of the annular hole is provided with a first guide support 201 and a second guide support 202 on the inner sidewall, and the rear end of the annular hole is provided with a third guide support 203 and a fourth guide support 204 on the inner sidewall.

[0035] For example Figure 9 , 10As shown, in this third embodiment, the self-locking latch 207 can be a buckle located at the rear end of the push block 200, and the locking position 101 is a crossbar located at the rear end of the track 100. When the push block 200 is in the second state, the buckle hooks onto the crossbar to lock it. Of course, the locking position 101 can also be the rear end face, notch, or groove of the track 100, and when the push block 200 is in the second state, the buckle latches onto the rear end face, notch, or groove to lock it.

[0036] The present invention also provides a locking control method for the above-mentioned self-locking thruster, comprising the following steps: Step 1: Push the propulsion block 200 backward along the track 100 to the rear end of the track 100. Specifically, the operator can manually push the propulsion block 200 backward along the track 100 to the rear end of the track 100. During the pushing process, the propulsion block 200 is in the first state (sliding backward), and its second guide support 202 and third guide support 203 are in contact with the track 100 to maintain the smooth backward movement of the propulsion block 200.

[0037] Step 2: Using the forward pulling force of the pull drive 300, the push block 200 automatically engages with the locking position 101 at the rear end of the track 100; specifically, when the push block 200 reaches the rear end of the track 100, the operator releases their hand, and the forward pulling force of the pull drive 300 causes the push block 200 to automatically switch to the second state (self-locking state). At this time, the first guide support 201 contacts the track 100, and the posture of the push block 200 changes so that its self-locking part 207 engages with the locking position 101 at the rear end of the track 100, and the push block 200 is locked at the rear end.

[0038] Step 3: Using the backward pushing force of the goods on the push block 200, the push block 200 is disengaged from the locking position 101 and unlocked. Specifically, the operator places the goods one by one in front of the push block 200. When the goods are full, the foremost goods contact the push block 200 and apply a backward pushing force to it. This pushing force causes the push block 200 to switch to the third state (unlocked state), and the self-locking part 207 disengages from the locking position 101, thus unlocking the push block 200.

[0039] Step 4: After the lock is released, the forward pulling force of the pull drive (300) is used to push the push block (200) forward along the track (100) to move the goods forward. Specifically, after unlocking, under the action of the forward pulling force of the pull drive (300), the push block 200 automatically switches to the fourth state (forward pushing state), the first guide support 201 and the fourth guide support 204 contact the track 100, the push block 200 slides smoothly forward along the track 100, and transmits the thrust to the goods, so that the goods are continuously pushed to the front end of the track 100.

[0040] As can be seen from the above method, the guide support part of at least one set of guide support parts (each set of guide support parts includes a first guide support part 201, a second guide support part 202, a third guide support part 203, and a fourth guide support part 204) at the assembly point of the propulsion block 200 and the track 100 has different contact and cooperation methods with the track 100 in multiple of the above-mentioned steps, so as to cooperate to realize the conversion of the four states of the propulsion block 200.

[0041] It should be noted that in the description of this invention, any descriptions of orientation, such as up, down, front, back, left, right, etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the purpose of facilitating the description of this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and should not be construed as a limitation of this invention.

[0042] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number, while "above," "below," "within," etc. are understood to include the stated number. If "first" or "second" is mentioned, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0043] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0044] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A self-locking thruster, characterized in that, Including: The track (100) has a locking slot (101) at its rear end. The push block (200) is mounted on the track (100) and can slide back and forth on the track (100). When pushed backward to the rear end of the track (100), it can automatically engage with the locking position (101) by the forward pulling force of the pull drive (300). It can also disengage from the locking position (101) to release the lock when pushed backward by the product. A tension drive (300) is connected to the front end of the push block (200) and the track (100) for applying a forward tension to the push block (200) after the push block (200) is disengaged from the locking position (101).

2. The self-locking thruster according to claim 1, characterized in that, The assembly point of the propulsion block (200) and the track (100) has at least one set of guide support parts. Each set of guide support parts includes a first guide support part (201), a second guide support part (202), a third guide support part (203), and a fourth guide support part (204). The contact combination between the guide support parts and the track (100) is different under different working states of the propulsion block (200).

3. The self-locking thruster according to claim 2, characterized in that, The first guide support (201) and the second guide support (202) are located on opposite sides of the front end of the assembly point between the propulsion block (200) and the track (100), and the third guide support (203) and the fourth guide support (204) are located on opposite sides of the rear end of the assembly point between the propulsion block (200) and the track (100).

4. The self-locking thruster according to claim 3, characterized in that, The push block (200) and the track (100) are connected by a sliding plate (205) and a sliding groove (102) structure. The front bottom surface and the surface of the sliding plate (205) are respectively provided with a first guide support (201) and a second guide support (202). The rear bottom surface and the surface of the sliding plate (205) are respectively provided with a third guide support (203) and a fourth guide support (204). The sliding plate (205) is assembled in the sliding groove (102) and can slide along the sliding groove (102). The width of the sliding groove (102) is greater than the thickness of the sliding plate (205).

5. The self-locking thruster according to claim 3, characterized in that, The propulsion block (200) and the track (100) are connected by a slide block (206) and a slide rod (103) structure. The slide block (206) is a U-shaped or annular structure and is slidably mounted on the slide rod (103). The width of the U-shaped notch or the inner diameter of the annular hole of the slide block (206) is greater than the outer diameter of the slide rod (103). The front end of the U-shaped notch or the annular hole of the slide block (206) is provided with a first guide support part (201) and a second guide support part (202) on the inner side wall respectively. The rear end of the U-shaped notch or the annular hole of the slide block (206) is provided with a third guide support part (203) and a fourth guide support part (204) on the inner side wall respectively.

6. The self-locking thruster according to claim 1, characterized in that, The tension drive component (300) is a coil spring, mounted on the push block (200), with the outer end of the coil spring extending from the bottom front end of the push block (200) and connected to the front end of the slide rail (100); or, The tension drive component (300) is a tension spring, with its two ends connected to the bottom front end of the push block (200) and the front end of the slide rail (100), respectively; or, The tension drive component (300) is a pull box, which is installed on the push block (200). The pull wire of the pull box extends from the bottom front end of the push block (200) and is connected to the front end of the slide rail (100).

7. The self-locking thruster according to claim 1, characterized in that, The propulsion block (200) has a self-locking latch (207) which is used to engage with the locking position (101) at the rear end of the track (100) when the propulsion block (200) is converted to the second state.

8. The self-locking thruster according to claim 7, characterized in that, The self-locking latch (207) is an undercut located at the rear end of the assembly point between the push block (200) and the track (100), and the locking position (101) is the rear end face of the track (100) or a notch provided at the rear end of the track (100).

9. The self-locking thruster according to claim 7, characterized in that, The self-locking latch (207) is an inverted buckle set at the rear end of the push block (200), and the locking position (101) is the rear end face of the track (100) or a crossbar provided at the rear end of the track (100).

10. A locking control method based on the self-locking thruster according to any one of claims 1-9, characterized in that, Includes the following steps: The propulsion block (200) is pushed backward along the track (100) to the rear end of the track (100); Using the forward pulling force of the pull drive (300), the push block (200) automatically engages with the locking position (101) at the rear end of the track (100). The backward pushing force of the product on the push block (200) causes the push block (200) to disengage from the locking position (101) and thus release the lock; After the lock is released, the forward pulling force of the pull drive (300) is used to propel the goods forward along the track (100) using the push block (200).

11. The locking method according to claim 10, characterized in that, The propulsion block (200) has at least one set of guide support parts at the assembly point with the track (100). Each set of guide support parts includes a first guide support part (201), a second guide support part (202), a third guide support part (203), and a fourth guide support part (204). The first guide support part (201), the second guide support part (202), the third guide support part (203), and the fourth guide support part (204) have different contact and engagement methods with the track (100) in multiple steps of the propulsion block (200).

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