Guardrail locking mechanism and picking vehicle

Abstract

This utility model relates to the technical field of picking carts, and specifically discloses a guardrail locking mechanism and a picking cart, including a positioning block, a first elastic member, a locking member, and an unlocking member. The positioning block is fixed to the bottom end of the guardrail and rotates synchronously with it, and is located in the receiving groove of the operating platform, having a first limit position and a second limit position. The first elastic member is connected to one end of the positioning block, driving the positioning block to move towards the limit position. The locking member is vertically mounted on the operating platform. When the positioning block is at the first limit position, the lower end of the locking member can be inserted into the receiving groove and locked against one side of the positioning block. The unlocking member penetrates the operating platform vertically, with its upper end connected to the locking member and its lower end extending below the operating platform. When the operating platform descends to a first preset height, the lower end of the unlocking member abuts against the base frame and moves upward, driving the locking member to disengage from the receiving groove and unlock the positioning block. This mechanism can automatically unlock the guardrail when the operating platform descends, improving the operational safety and convenience of the picking cart.

Description

Technical Field

[0001] This utility model relates to the technical field of picking carts, and specifically to a guardrail locking mechanism and a picking cart. Background Technology

[0002] With the rapid development of the logistics and warehousing industry, picking carts, as important equipment in warehousing and logistics operations, are widely used in the picking operations of various warehouses. Picking carts typically include a base frame, support frame, operating platform, and pallets. The operating platform can be raised and lowered so that operators can perform picking operations at different heights. To ensure the safety of operators, the operating platform of the picking cart is usually equipped with a guardrail structure to prevent operators from falling when working at heights.

[0003] However, the existing guardrail locking mechanism has the following technical problems:

[0004] First, when the guardrail is raised to a high height with the operating platform, the existing guardrail locking mechanism usually cannot achieve automatic locking. Operators need to manually lock it using bolts or pins. This operation method is not only cumbersome, but also easy for operators to forget to lock it due to negligence, which will result in the guardrail being in an unsafe state when working at height, which is very likely to cause safety accidents.

[0005] Secondly, during the lifting and lowering of the operating platform, the existing guardrail locking mechanism may cause the guardrail to unlock unexpectedly due to factors such as vibration or collision, causing the guardrail to change from a protective state to a retracted state, which cannot provide effective safety protection for the operator and poses a serious safety hazard.

[0006] In addition, the existing guardrail locking mechanism lacks automatic locking and unlocking functions that are correlated with the height of the operating platform. It cannot automatically adjust the locking status of the guardrail according to the actual height of the operating platform, which increases the operator's workload and reduces the safety and convenience of the equipment. Utility Model Content

[0007] This utility model addresses the aforementioned problems and aims to provide a guardrail locking mechanism and a picking cart that enables automatic locking and unlocking of the guardrail, making operation more convenient and providing better locking stability, thus avoiding safety accidents caused by forgetting.

[0008] To achieve the above objectives, this utility model provides a guardrail locking mechanism. The guardrail is rotatably mounted on the operating platform of a picking cart. The picking cart also includes a base frame and a support frame arranged vertically on the base frame. The operating platform is liftably mounted on one side of the support frame. The locking mechanism includes:

[0009] A positioning block is fixed to the bottom end of the guardrail and rotates synchronously with it. The positioning block is located in the receiving groove of the operating platform and has a first limit position and a second limit position. When the positioning block is in the first limit position, the guardrail is in a protective state. When the positioning block is in the second limit position, the guardrail is in a retracted state.

[0010] A first elastic element is connected to one end of the positioning block and is used to drive the positioning block to move toward a first extreme position or a second extreme position.

[0011] A locking member is provided on the operating platform in a height-adjustable manner. When the positioning block is at the first extreme position, the lower end of the locking member can be inserted into the receiving groove and can fit against one side of the positioning block to lock the positioning block.

[0012] The unlocking component penetrates the operating platform vertically, with its upper end connected to the locking component and its lower end extending below the operating platform.

[0013] When the operating platform descends to the first preset height, the lower end of the unlocking component abuts against the base frame and moves upward, driving the locking component to disengage from the receiving groove, thereby unlocking the positioning block.

[0014] According to the above-described guardrail locking mechanism, the positioning block is provided with a positioning protrusion, the side wall of the receiving groove is provided with a positioning groove, and the positioning groove is provided with a first side wall and a second side wall. When the positioning block is located at the first extreme position, one side of the positioning protrusion abuts against the first side wall, and when the positioning block is located at the second extreme position, the other side of the positioning protrusion abuts against the second side wall.

[0015] According to the above-described guardrail locking mechanism, the locking member includes a plug, the lower end of which can be inserted into the positioning groove, and the lower end of the plug has a locking plane and a guide slope. When the positioning block is in the first extreme position, the locking plane can abut against the side of the positioning protrusion away from the first sidewall. The guide slope is inclinedly arranged between the first sidewall and the second sidewall and inclined towards the first sidewall.

[0016] According to the above-described guardrail locking mechanism, the operating platform is provided with a support plate, the support plate is provided with a plurality of adjustment holes along the vertical direction, one of the adjustment holes is provided with a positioning shaft, the insert is provided with an adjustment groove arranged along the vertical direction, and the positioning shaft is movably inserted into the adjustment groove.

[0017] The locking component also includes a pull-down spring. One side of the upper end of the insert block is provided with an ear plate. The lower end of the pull-down spring is connected to the operating platform, and the upper end of the pull-down spring is connected to the ear plate. The pull-down spring is in a stretched state.

[0018] According to the above-described guardrail locking mechanism, the first elastic element includes a positioning spring, the bottom of the operating platform is provided with a first connecting post, the end of the positioning block near the positioning protrusion is provided with a second connecting post, the end of the positioning block away from the second connecting post is connected to the bottom end of the guardrail, and the two ends of the positioning spring are rotatably connected to the first connecting post and the second connecting post respectively.

[0019] According to the above-described guardrail locking mechanism, the positioning block also has a dead point position. When the positioning block is in the dead point position, the hinge point between the positioning protrusion and the first connecting post, the connection point between the positioning block and the guardrail, and the hinge point between the positioning protrusion and the second connecting post are all located on the same straight line. The first extreme position is located to the left of the dead point position, and the second extreme position is located to the right of the dead point position.

[0020] According to the above-described guardrail locking mechanism, the unlocking component includes a positioning seat, a pin, a compression spring, and a lifting part. The positioning seat is fixed on the operating platform, the pin passes through the positioning seat, the compression spring is sleeved on the outside of the pin and is used to provide a downward elastic force to the pin, the lifting part is fixedly connected to the upper end of the pin, and the upper end of the locking component abuts against the top of the retaining ring on the side of the lifting part through a connecting plate.

[0021] According to the above-described guardrail locking mechanism, the top of the positioning seat is provided with two first grooves and two second grooves arranged opposite to each other. The depth of the first groove is greater than the depth of the second groove. The bottom of the lifting part is provided with a limiting block. The limiting block can be inserted into the first groove or the second groove. When the limiting block is inserted into the second groove, the lower end of the locking member can be disengaged from the receiving groove.

[0022] According to the above-described guardrail locking mechanism, a buffer block is provided on the bottom end of the pin, and the buffer block is made of elastic material.

[0023] A picking cart, comprising:

[0024] Base frame;

[0025] A support frame, which is arranged vertically in the middle of the base frame;

[0026] The operating platform is height-adjustable and is mounted on one side of the support frame, and is equipped with a guardrail.

[0027] The tray, which is liftable, is located on the other side of the support frame;

[0028] The guardrail locking mechanism described above is arranged on the operating platform and connected to the guardrail.

[0029] This utility model has the following beneficial effects:

[0030] 1. By setting a physical contact mechanism between the unlocking component and the base frame, when the operating platform descends to the preset height, the lower end of the unlocking component abuts against the base frame and moves upward, driving the locking component to disengage from the receiving slot, automatically releasing the guardrail from its locked state without manual intervention, thus realizing the automatic unlocking function of the guardrail.

[0031] 2. When the operating platform is raised, the unlocking part disengages from the base frame, and the locking part automatically moves down and inserts into the receiving slot under the action of the downward spring. The operator only needs to push the guardrail to rotate, so that the positioning block moves to the first limit position. At this time, the locking part abuts against the positioning block under the drive of the first elastic element, realizing the automatic locking of the guardrail, avoiding safety accidents caused by human forgetting to lock the guardrail during high-altitude operations.

[0032] 3. Through the design of the lifting part, under special working requirements, the lifting part can be pulled up and rotated 90 degrees to make the limit block engage in the second groove, thereby realizing the manual unlocking function of the guardrail, which enhances the applicability and flexibility of the equipment.

[0033] 4. As the guardrail rotates, the positioning spring can switch the direction of the force applied to the locking component, thereby driving the locking component to remain in the first limit position or the second limit position. This can prevent the guardrail from rotating randomly in the unlocked state and improve its stability.

[0034] 5. The overall structure is reasonably designed and easy to operate, which improves the safety and ease of operation of the logistics warehouse picking vehicle operating platform, and is especially suitable for frequent lifting operations. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall mechanism of the picking cart in the embodiment;

[0036] Figure 2 This is a schematic diagram of the locking mechanism assembly in an embodiment;

[0037] Figure 3 This is a schematic diagram of the assembly of the locking and unlocking components in an embodiment;

[0038] Figure 4 This is a schematic diagram of the exploded structure of the unlocking component in an embodiment.

[0039] In the picture:

[0040] 100. Locking mechanism; 110. Positioning block; 111. Positioning protrusion; 112. Second connecting post; 120. Positioning spring; 130. Locking component; 131. Insert block; 131a. Locking plane; 131b. Guide slope; 131c. Adjustment groove; 131d. Ear plate; 132. Connecting plate; 140. Unlocking component; 141. Positioning seat; 141a. First groove; 141b. Second groove; 142. Pin; 142a. Buffer block; 143. Compression spring; 144. Lifting part; 144a. Limiting block;

[0041] 200. Operating platform; 210. Guardrail; 220. Receiving groove; 221. Positioning groove; 230. Support plate; 231. Adjustment hole; 240. First connecting column;

[0042] 300. Base frame;

[0043] 400. Support frame;

[0044] 500. Pallet. Detailed Implementation

[0045] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0046] like Figures 1-4 As shown, a guardrail locking mechanism includes a positioning block 110, a first elastic element, a locking element 130, and an unlocking element 140.

[0047] The guardrail 210 is rotatably mounted on the operating platform 200 of the picking cart. The picking cart also includes a base frame 300 and a support frame 400 arranged vertically on the base frame 300. The operating platform 200 is height-adjustable and mounted on one side of the support frame 400. Since the driver needs to stand on the operating platform 200 to operate the picking cart during operation, and the operating platform 200 needs to be raised to a higher position to improve the driver's visibility, if the driver falls from the operating platform 200 as it rises, it will... This poses a significant safety risk and could result in personal injury or death. Therefore, guardrails 210 need to be installed on the operating platform 200. Since the operating platform 200 has no obstructions on three sides, guardrails 210 only need to be installed on the three sides. The guardrails 210 installed on the two symmetrical sides are fixed guardrails 210, while the guardrail 210 on the other side is movable to facilitate the driver's entry and exit from the operating platform 200. In this embodiment, guardrail 210 specifically refers to the movable guardrail 210, which is provided in two symmetrical arrangements on the same side of the operating platform 200.

[0048] Specifically, the positioning block 110 is fixed to the bottom end of the guardrail 210 and rotates synchronously with it. The positioning block 110 is located in the receiving groove 220 of the operating platform 200, and the positioning block 110 has a first limit position and a second limit position. When the positioning block 110 is in the first limit position, the guardrail 210 is in a protective state; when the positioning block 110 is in the second limit position, the guardrail 210 is in a retracted state. Since the positioning block 110 rotates synchronously with the guardrail 210, when the positioning block 110 rotates to the first limit position, the guardrail 210 is in a retracted state. The guardrail 210 also rotates to the unfolded position, at which point the guardrail 210 can play a protective role, so it is in a protective state. When the positioning block 110 rotates to the second limit position, the guardrail 210 also rotates to the retracted position. At this time, the guardrail 210 no longer obstructs the driver, making it convenient for the driver or other objects to enter and exit the operating platform 200. The guardrail 210 is in a retracted state, while the positioning block 110 can only move between the first limit position and the second limit position. The guardrail 210 can only switch between the maintenance state and the retracted state.

[0049] Specifically, the first elastic element is connected to one end of the positioning block 110 and is used to drive the positioning block 110 to move toward the first extreme position or the second extreme position. The locking element 130 is movably mounted on the operating platform 200. When the positioning block 110 is at the first extreme position, the lower end of the locking element 130 can be inserted into the receiving groove 220 and can fit against one side of the positioning block 110 to lock the positioning block 110, thereby locking the guardrail 210, preventing the guardrail 210 from being accidentally unlocked, and improving safety performance. The unlocking element 140 penetrates the operating platform 200 vertically. The upper end of the unlocking element 140 is connected to the locking element 130, and the lower end of the unlocking element 140 extends to the bottom of the operating platform 200. When descending to the first preset height, the lower end of the unlocking component 140 abuts against the base frame 300 and moves upward. The upward movement of the unlocking component 140 can drive the locking component 130 to move upward synchronously, thereby allowing the lower end of the locking component 130 to disengage from the receiving groove 220 and unlocking the positioning block 110. After unlocking, the positioning block 110 is elastically positioned by the first elastic component. As long as the driver applies a force greater than the elastic force to the guardrail 210, the guardrail 210 can be rotated, thereby rotating it from the protective state to the retracted state, realizing the automatic unlocking of the positioning block 110 and the guardrail 210 without manual operation. This achieves the function of high-position locking and low-position automatic unlocking, which improves safety performance and reduces the difficulty of operation.

[0050] Furthermore, a positioning protrusion 111 is provided on the positioning block 110, and a positioning groove 221 is provided on the side wall of the receiving groove 220. The positioning groove 221 is provided with a first side wall and a second side wall. When the positioning block 110 is located at the first extreme position, one side of the positioning protrusion 111 abuts against the first side wall. When the positioning block 110 is located at the second extreme position, the other side of the positioning protrusion 111 abuts against the second side wall. The function of the positioning groove 221 is to limit the rotation angle of the positioning block 110, so that the positioning protrusion 111 can only move within the positioning groove 221, thereby limiting the rotation angle of the guardrail 210.

[0051] Furthermore, the locking member 130 includes an insert block 131, the lower end of which can be inserted into the positioning groove 221. The lower end of the insert block 131 has a locking plane 131a and a guide slope 131b. When the positioning block 110 is in the first extreme position, the locking plane 131a can abut against the side of the positioning protrusion 111 away from the first sidewall. The guide slope 131b is inclined between the first sidewall and the second sidewall and inclined towards the first sidewall. Since the insert block 131 is arranged vertically, when the positioning protrusion 111 abuts against the locking plane 131a, the positioning protrusion 111 cannot drive the insert block 131 to move up and down. Thus, the positioning block can be locked by the insert block 131. 110 is locked at the first extreme position. When the positioning block 110 is at the second extreme position, the positioning protrusion 111 abuts against the guide slope 131b. The movement of the positioning protrusion 111 can push the insertion block 131 upward, thereby enabling the positioning block 110 to rotate. It can move to the first extreme position, that is, when the guardrail 210 is in the retracted state, as long as the driver provides enough force to the guardrail 210, the guardrail 210 can be driven to rotate to the unfolded position, that is, the protective state. When the guardrail 210 is in the protective state, no matter how much force is applied to the guardrail 210, it cannot be driven to rotate, thus achieving rigid locking and improving safety performance.

[0052] Furthermore, to enable the vertical movement of the insertion block 131 and restrict its translational movement, a support plate 230 is provided on the operating platform 200. The support plate 230 has multiple adjustment holes 231 arranged vertically, one of which houses a positioning shaft. The insertion block 131 has a vertically arranged adjustment groove 131c, through which the positioning shaft movably passes. The diameter of the positioning shaft is the same as the width of the adjustment groove 131c. Therefore, with the positioning shaft in a fixed position, the insertion block 131 can only move vertically through the adjustment groove 131c. Its lowest position is where the positioning shaft abuts against the upper end of the adjustment groove 131c. The height of the insert 131 can be adjusted through the adjustment holes 231 of different heights, which is suitable for different models of insert 131. The locking component 130 also includes a pull-down spring. The upper end of the insert 131 is provided with an ear plate 131d. The lower end of the pull-down spring is connected to the operating platform 200, and the upper end of the pull-down spring is connected to the ear plate 131d. The pull-down spring is in a stretched state, and the elastic force of the pull-down spring acts on the ear plate 131d, driving the insert 131 to always stay in the lowest position. At this time, the lower end of the insert 131 is located in the positioning groove 221. When the positioning block 110 is in the first limit position, the insert 131 can always lock the positioning block 110.

[0053] Furthermore, the first elastic element includes a positioning spring 120, a first connecting post 240 is provided at the bottom of the operating platform 200, a second connecting post 112 is provided at the end of the positioning block 110 near the positioning protrusion 111, the end of the positioning block 110 away from the second connecting post 112 is connected to the bottom end of the guardrail 210, and the two ends of the positioning spring 120 are rotatably connected to the first connecting post 240 and the second connecting post 112 respectively. The position of the first connecting post 240 is fixed, but the position of the second connecting post 112 rotates with the rotation of the positioning block 110. During the rotation of the second connecting post 112, the distance between it and the first connecting post 240 is also constantly adjusted, thereby adjusting the direction of the force of the positioning spring 120.

[0054] Furthermore, the positioning block 110 also has a dead point position. When the positioning block 110 is in the dead point position, the hinge point between the positioning protrusion 111 and the first connecting post 240, the connection point between the positioning block 110 and the guardrail 210, and the hinge point between the positioning protrusion 111 and the second connecting post 112 are all on the same straight line. In this state, the positioning spring 120 is stretched to its maximum length. Whether the positioning block 110 moves from the first extreme position to the second extreme position, or from the second extreme position to the first extreme position, the positioning block 110 needs to pass through this dead point position. The first extreme position is located to the left of the dead point position, and the second extreme position is located at the dead point. On the right side of the position, taking the movement of positioning block 110 from the second extreme position to the first extreme position as an example, during the movement from the second extreme position to the dead position, positioning spring 120 is continuously stretched. The elastic force of positioning spring 120 acts towards the second extreme position. At this time, the operator needs to apply force to the guardrail 210 to overcome the elastic force. When positioning block 110 crosses the dead position, positioning block 110 moves from the dead position to the first extreme position. Positioning spring 120 is continuously shortened, and its elastic force acts towards the first extreme position, which can assist in driving positioning block 110 to move towards the first extreme position and elastically lock positioning block 110.

[0055] Furthermore, the unlocking component 140 includes a positioning seat 141, a pin 142, a compression spring 143, and a lifting part 144. The positioning seat 141 is fixed on the operating platform 200. The pin 142 passes through the positioning seat 141. The compression spring 143 is sleeved on the outside of the pin 142 and is used to provide a downward elastic force to the pin 142. The lifting part 144 is fixedly connected to the upper end of the pin 142. The upper end of the locking component 130 abuts against the top of the retaining ring on the side of the lifting part 144 through the connecting plate 132. The pin 142 movably passes through the locking component 130. On the positioning seat 141, gravity and the presence of the compression spring 143 can drive it to remain downward, so that the lower end of the pin 142 can extend below the operating platform 200. After it abuts against the base frame 300, the pin 142 can be driven to rise against the elastic force of the compression spring 143, which drives the lifting part 144 to rise, thereby driving the locking member 130 to rise through the connecting plate 132. After the locking member 130 rises, it can release the locking effect on the positioning block 110, releasing the rigid locking of the positioning block 110.

[0056] Furthermore, in order to unlock the guardrail 210 from a high position, two first grooves 141a and two second grooves 141b are arranged opposite to each other on the top of the positioning seat 141. The depth of the first groove 141a is greater than the depth of the second groove 141b. A limiting block 144a is provided at the bottom of the lifting part 144. The limiting block 144a can be inserted into the first groove 141a or the second groove 141b. When the limiting block 144a is inserted into the second groove 141b, the height of the limiting block 144a is increased, which will cause the height of the lifting part 144 to increase. This allows the lower end of the locking member 130 to disengage from the receiving groove 220, thereby unlocking the positioning block 110. That is, the guardrail 210 can be unlocked even at high altitudes, meeting different needs.

[0057] Furthermore, a buffer block 142a is provided on the bottom end of the pin 142. The buffer block 142a is made of elastic material, which can prevent the pin 142 from rigidly impacting the base frame 300 and prevent damage to the pin 142 or the base frame 300.

[0058] A picking cart includes a base frame 300, a support frame 400, an operating platform 200, a pallet 500, and the aforementioned guardrail locking mechanism 100. The support frame 400 is arranged vertically in the middle of the base frame 300. The operating platform 200 is height-adjustable on one side of the support frame 400 and is provided with a guardrail 210. The pallet 500 is height-adjustable on the other side of the support frame 400 and is used to place goods. The guardrail 210 locking mechanism 100 is arranged on the operating platform 200 and is connected to the guardrail 210 for locking or unlocking the guardrail 210.

[0059] The working principle of the guardrail locking mechanism 100 in this embodiment is as follows:

[0060] When the picking cart is in normal working condition, the guardrail 210 is in a protective state. At this time, the positioning block 110 is in the first extreme position, one side of the positioning protrusion 111 abuts against the first side wall of the positioning groove 221, the lower end of the locking member 130's insert 131 is inserted into the positioning groove 221 in the receiving groove 220, and the locking plane 131a of the insert 131 abuts against the side of the positioning protrusion 111 away from the first side wall, thereby locking the positioning block 110 and preventing the guardrail 210 from rotating and retracting accidentally.

[0061] When the operating platform 200 needs to be lowered to the vicinity of the base frame 300, the operating platform 200 is lowered to the first preset height. The buffer block 142a at the lower end of the pin 142 of the unlocking component 140 abuts against the base frame 300. As the operating platform 200 continues to descend, the pin 142 moves upward relative to the operating platform 200, driving the lifting part 144 to move upward. The lifting part 144 drives the insertion block 131 of the locking component 130 to move upward through the retaining ring and the connecting plate 132, so that the insertion block 131 is disengaged from the positioning groove 221 in the receiving groove 220, thereby unlocking the positioning block 110. At this time, the operator can manually rotate the guardrail 210 to change the guardrail 210 from the protective state to the retracted state. The positioning block 110 also rotates from the first limit position to the second limit position. The other side of the positioning block 110 abuts against the second side wall of the positioning groove 221.

[0062] When the guardrail 210 needs to be restored from the retracted state to the protective state, the operator manually rotates the guardrail 210, and the positioning block 110 rotates from the second limit position to the first limit position. During the rotation, the positioning block 110 will pass through the dead point position. At this time, the hinge point between the positioning protrusion 111 and the first connecting post 240, the connection point between the positioning block 110 and the guardrail 210, and the hinge point between the positioning protrusion 111 and the second connecting post 112 are all on the same straight line. After the positioning block 110 rotates past the dead point position, the positioning spring 120 will drive the positioning block 110 to continue rotating to the first limit position and abut against the first side wall. At this time, under the action of the pull-down spring, the locking member 130 inserts the block 131 downward and inserts it into the positioning groove 221. The locking plane 131a abuts against the side of the positioning protrusion 111 away from the first side wall, thereby locking the positioning block 110 and stabilizing the guardrail 210 in the protective state.

[0063] When it is necessary to manually unlock the guardrail 210, the limiting block 144a on the lifting part 144 can be switched from the first groove 141a to the second groove 141b. At this time, the insert block 131 of the locking member 130 moves up and disengages from the receiving groove 220, thereby unlocking the positioning block 110 and allowing the guardrail 210 to rotate freely.

[0064] The technical solution of this utility model has been described in detail above with reference to the accompanying drawings. The described embodiments are used to help understand the concept of this utility model. The specific embodiments described herein are merely illustrative examples of the spirit of this utility model. Those skilled in the art to which this utility model pertains can make various modifications or additions to the described specific embodiments or use similar methods to replace them, but without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0065] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0066] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0067] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0068] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A guardrail locking mechanism, wherein the guardrail is rotatably mounted on the operating platform of a picking cart, the picking cart further comprising a base frame and a support frame arranged vertically on the base frame, and the operating platform is liftably mounted on one side of the support frame, characterized in that, The locking mechanism includes: A positioning block is fixed to the bottom end of the guardrail and rotates synchronously with it. The positioning block is located in the receiving groove of the operating platform and has a first limit position and a second limit position. When the positioning block is in the first limit position, the guardrail is in a protective state. When the positioning block is in the second limit position, the guardrail is in a retracted state. A first elastic element is connected to one end of the positioning block and is used to drive the positioning block to move toward a first extreme position or a second extreme position. A locking member is provided on the operating platform in a height-adjustable manner. When the positioning block is at the first extreme position, the lower end of the locking member can be inserted into the receiving groove and can fit against one side of the positioning block to lock the positioning block. The unlocking component extends vertically through the operating platform, with its upper end connected to the locking component and its lower end extending below the operating platform. When the operating platform descends to the first preset height, the lower end of the unlocking component abuts against the base frame and moves upward, driving the locking component to disengage from the receiving groove, thereby unlocking the positioning block.

2. The guardrail locking mechanism according to claim 1, characterized in that, The positioning block is provided with a positioning protrusion, and the side wall of the receiving groove is provided with a positioning groove. The positioning groove is provided with a first side wall and a second side wall. When the positioning block is located at the first extreme position, one side of the positioning protrusion abuts against the first side wall. When the positioning block is located at the second extreme position, the other side of the positioning protrusion abuts against the second side wall.

3. A guardrail locking mechanism according to claim 2, characterized in that, The locking member includes a plug, the lower end of which can be inserted into the positioning groove. The lower end of the plug has a locking plane and a guide slope. When the positioning block is in the first extreme position, the locking plane can abut against the side of the positioning protrusion away from the first sidewall. The guide slope is inclinedly arranged between the first sidewall and the second sidewall and inclined towards the first sidewall.

4. A guardrail locking mechanism according to claim 3, characterized in that, The operating platform is provided with a support plate, and the support plate is provided with a plurality of adjustment holes along the vertical direction. One of the adjustment holes is provided with a positioning shaft. The insert block is provided with an adjustment groove arranged along the vertical direction, and the positioning shaft is movably inserted into the adjustment groove. The locking component also includes a pull-down spring. One side of the upper end of the insert block is provided with an ear plate. The lower end of the pull-down spring is connected to the operating platform, and the upper end of the pull-down spring is connected to the ear plate. The pull-down spring is in a stretched state.

5. A guardrail locking mechanism according to claim 2, characterized in that, The first elastic element includes a positioning spring. The bottom of the operating platform is provided with a first connecting post. The end of the positioning block near the positioning protrusion is provided with a second connecting post. The end of the positioning block away from the second connecting post is connected to the bottom end of the guardrail. The two ends of the positioning spring are rotatably connected to the first connecting post and the second connecting post, respectively.

6. A guardrail locking mechanism according to claim 5, characterized in that, The positioning block also has a dead point position. When the positioning block is in the dead point position, the hinge point between the positioning protrusion and the first connecting post, the connection point between the positioning block and the guardrail, and the hinge point between the positioning protrusion and the second connecting post are all located on the same straight line. The first extreme position is located to the left of the dead point position, and the second extreme position is located to the right of the dead point position.

7. A guardrail locking mechanism according to claim 1, characterized in that, The unlocking component includes a positioning seat, a pin, a compression spring, and a lifting part. The positioning seat is fixed on the operating platform, the pin passes through the positioning seat, the compression spring is sleeved on the outside of the pin and is used to provide a downward elastic force to the pin, the lifting part is fixedly connected to the upper end of the pin, and the upper end of the locking component abuts against the top of the retaining ring on the side of the lifting part through a connecting plate.

8. A guardrail locking mechanism according to claim 7, characterized in that, The top of the positioning seat is provided with two first grooves and two second grooves arranged opposite to each other. The depth of the first groove is greater than the depth of the second groove. The bottom of the lifting part is provided with a limiting block. The limiting block can be inserted into the first groove or the second groove. When the limiting block is inserted into the second groove, the lower end of the locking member can be disengaged from the receiving groove.

9. A guardrail locking mechanism according to claim 7, characterized in that, A buffer block is provided at the bottom end of the pin, and the buffer block is made of elastic material.

10. A picking cart, characterized in that, include: Base frame; A support frame, which is arranged vertically in the middle of the base frame; The operating platform is height-adjustable and is mounted on one side of the support frame, and is equipped with a guardrail. The tray, which is liftable, is located on the other side of the support frame; The guardrail locking mechanism as described in any one of claims 1-9 is arranged on the operating platform and connected to the guardrail.

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