An auxiliary device for easy lifting of carts and quick connection of chains
By designing an auxiliary device that facilitates quick connection between the trolley and the chain, and utilizing a plug and elastic locking mechanism to achieve rapid connection and unlocking, the safety hazards of manual operation during the movement of the trolley are solved, and safety and operational reliability are improved.
Patent Information
- Application Number
- CN202522074116.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-26
- Publication Date
- 2026-11-06
- Estimated Expiration
- 2035-09-26
AI Technical Summary
During the tapping operation of industrial silicon smelting, the connecting rod pins need to be frequently replaced during the movement of the ladle trolley, which causes workers to operate in a high-temperature environment, posing a safety hazard.
An auxiliary device for quick connection of the cart and chain was designed, including an iron chain, connecting rod, connector, elastic locking mechanism and unlocking mechanism. The quick connection and unlocking are achieved through the insertion rod and elastic locking mechanism, avoiding manual operation in the track trench.
It improves the safety and reliability of operation, reduces the safety risks of manual operation, increases escape time, and does not require large-scale modification of existing equipment.
Smart Images
Figure CN224939925U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of smelting equipment, specifically to an auxiliary device that facilitates the lifting of carts and the quick connection of chains. Background Technology
[0002] In industrial silicon smelting, ladles are used to collect molten silicon during furnace tapping. The ladles are typically fixed to a ladle trolley, which has two symmetrical connecting rods for connecting chains to switch the direction of movement. The ladle trolley moves along a track laid on the ground on both sides of a circular track trench. Two winches are located at the same position in the trench, sharing a single steel wire rope placed inside the trench. Multiple chains are connected to the steel wire rope, with the other end of each chain fixed to the connecting rod on the ladle trolley via pins. The winches pull the ladle trolley, thus moving and transporting the ladle.
[0003] The current problem is that during each round trip of the ladle, it is necessary to manually go down into the track trench to remove the pin on the original connecting rod on one side and then reconnect the other chain and the connecting rod on the other side by inserting a pin to fix them together, so as to switch the direction of movement. Since the temperature of the molten silica in the ladle is generally in the range of 1700-1800℃, and this operation is frequent, the person is basically very close to the ladle during the installation and disassembly process, and is also in the track trench at the same time. If molten silica splashes or the ladle is burned through, the person cannot escape quickly, which can easily lead to safety accidents and poses a significant safety risk. Utility Model Content
[0004] The purpose of this utility model is to provide an auxiliary device that facilitates lifting carts and quick chain connection.
[0005] This utility model is implemented by the following technical solution: An auxiliary device for facilitating the lifting of a cart and quick connection of a chain includes an iron chain and a connecting rod. The connecting rod has a vertical insertion hole. One end of the iron chain is connected to a steel wire rope. The device also includes a connector, an elastic locking mechanism, an insertion rod, and an unlocking mechanism. The connector is movably inserted into the connecting rod. The top of the connector has an elastic locking mechanism. The insertion rod is inserted into the connector and locked by the elastic locking mechanism. The insertion rod has an unlocking mechanism inside. When the insertion rod is pulled out of the connector, it is unlocked by the unlocking mechanism. One side of the bottom of the connector is connected to the other end of the iron chain. The connector includes: a pin, a channel steel, and a lifting ring; the top of the pin is fixed with a channel steel at a 45° angle, the pin is inserted into a hole on the connecting rod, a lifting ring is fixed on one side of the channel steel, and the lifting ring is connected to the other end of the chain.
[0006] Preferably, the elastic locking mechanism comprises a U-shaped plate, and a trapezoidal clamping block, a limiting plate, a sliding column and a first compression spring which are fixedly connected in sequence; the U-shaped plate is fixed to the top of a channel steel, a first limiting hole is formed in the middle of the U-shaped plate, a rectangular groove corresponding to the first limiting hole is formed in the upper surface of the top of the channel steel, the trapezoidal clamping block is slidably arranged in the rectangular groove, the inclined surface of the trapezoidal clamping block faces outward, the limiting plate is movably arranged between the channel steel and the U-shaped plate, the sliding column is slidably arranged in the first limiting hole in a penetrating manner, the first compression spring is sleeved on the sliding column, one end of the first compression spring abuts against the limiting plate, and the other end of the first compression spring abuts against the lower surface of the middle part of the U-shaped plate.
[0007] Preferably, the insertion rod comprises a circular tube, a connecting head and an insertion block; an internal thread is provided on the inner side of one end of the circular tube, one end of the circular tube is in threaded connection with the connecting head, and the connecting head and the insertion block are fixedly connected through a bolt.
[0008] Preferably, the connecting head comprises an externally threaded tube, a square plate and a rectangular sliding rod which are fixedly connected in sequence; the externally threaded tube is in threaded connection with one end of the circular tube, two accommodating grooves are symmetrically formed in the middle of the externally threaded tube, two first through holes corresponding to the accommodating grooves are symmetrically formed in the square plate and the rectangular sliding rod, a limiting groove is horizontally formed in the middle of the rectangular sliding rod, a second through hole is formed in the center of the square plate, and the second through hole is in communication with the limiting groove.
[0009] Preferably, two right-angle triangular prisms are symmetrically fixed on the upper and lower sides of one end of the insertion block, two threaded holes corresponding to the first through holes are formed in one end of the insertion block, a bolt passes through the first through holes to be in threaded connection with the threaded holes, a hole groove is formed in the center of one end of the insertion block, the insertion block is inserted into the channel steel, and the outer side edge of each right-angle triangular prism is movably clamped with the surface of the trapezoidal clamping block.
[0010] Preferably, the unlocking mechanism comprises a manual push tube, a short rod, a push rod, an unlocking slider and a second compression spring; two limiting sliding grooves are symmetrically formed in the circular tube, two third through holes are symmetrically formed in the manual push tube, the manual push tube is slidably sleeved on the circular tube, the short rod is slidably arranged in the two limiting sliding grooves on the circular tube in a penetrating manner, two ends of the short rod are fixedly arranged in the two third through holes on the manual push tube in a penetrating manner, the middle part of the short rod is vertically fixed to one end of the push rod, the other end of the push rod passes through the second through hole to abut against the middle part of the transverse bar on the unlocking slider, the unlocking slider is in a shape of the Chinese character "Ri", comprising a transverse bar and a rectangular frame fixed on the outer side of the transverse bar, the transverse bar slides on the limiting groove, the rectangular frame is slidably sleeved on the outer side of the rectangular sliding rod, the second compression spring is arranged in the hole groove on the insertion block, one end of the second compression spring abuts against the transverse bar, the other end of the second compression spring abuts against the bottom end of the hole groove, and a chamfer is formed at one side edge of the outer frame of the rectangular frame.
[0011] Preferably, the bevel width of the chamfer, the bevel width of the trapezoidal block, and the bevel width of the right-angled triangular prism are equal, and the bevel of one side of the rectangular frame and the bevel of the trapezoidal block slide in contact.
[0012] The advantages of this utility model are: no major changes to the on-site equipment are required; the connector can be simply attached to the existing iron chain. In actual use, the connector can be quickly connected to the connecting rod on the baggage cart using the insertion tool, making the operation convenient. Moreover, during operation, the operator does not need to enter the track trench; they can operate from the side of the track. Compared with the original, the operation is safer and more reliable, and the safety distance is increased. Even in the event of danger, it increases the reaction time for escape. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 yes Figure 1 Top view; Figure 3 yes Figure 2 Sectional view at point A in the middle; Figure 4 for Figure 3 Partial structural changes diagram; Figure 5 This is a structural schematic diagram of the connector; Figure 6 A schematic diagram of the combination of the connector and the elastic locking mechanism; Figure 7 This is a partial structural diagram of the elastic locking mechanism; Figure 8 This is a schematic diagram of the insert rod structure; Figure 9 for Figure 8 An explosion diagram; Figure 10 for Figure 9 Enlarged view of point B in the middle; Figure 11 for Figure 9 Enlarged view of point C in the middle; Figure 12 This is a schematic diagram of the connector structure; Figure 13 A schematic diagram of the unlocking slider; Figure 14 This is a reference diagram for the field use of the device.
[0014] In the diagram: 1. Chain; 2. Connecting rod; 2.1. Connecting hole; 3. Connecting piece; 3.1. Pin; 3.2. Channel steel; 3.21. Rectangular groove; 3.3. Lifting ring; 4. Elastic locking mechanism; 4.1. U-shaped plate; 4.11. First limiting hole; 4.2. Trapezoidal block; 4.3. Limiting plate; 4.4. Sliding column; 4.5. First compression spring; 5. Insert rod; 5.1. Round tube; 5.11. Limiting slide groove; 5.2. Connecting head; 5.21. Externally threaded tube; 5.211. Receiving groove; 5.2 2. Square plate, 5.221. First through hole, 5.222. Second through hole, 5.23. Rectangular slide bar, 5.231. Limiting groove, 5.3. Insert block, 5.31. Right-angled triangular prism, 5.32. Threaded hole, 5.33. Hole groove, 6. Unlocking mechanism, 6.1. Manual push tube, 6.11. Third through hole, 6.2. Short rod, 6.3. Push rod, 6.4. Unlocking slider, 6.41. Horizontal bar, 6.42. Rectangular frame, 6.421. Chamfer, 6.5. Second compression spring, 7. Cart lifting. Detailed Implementation
[0015] like Figures 1 to 14 As shown, an auxiliary device for facilitating the lifting of a cart and quick connection of a chain includes a chain 1 and a connecting rod 2. The connecting rod 2 has a vertical insertion hole 2.1. One end of the chain 1 is connected to a steel wire rope. The device also includes a connector 3, an elastic locking mechanism 4, an insertion rod 5, and an unlocking mechanism 6. The connector 3 is movably inserted into the connecting rod 2. The top of the connector 3 is provided with the elastic locking mechanism 4. The insertion rod 5 is inserted into the connector 3 and locked by the elastic locking mechanism 4. The insertion rod 5 is provided with the unlocking mechanism 6. When the insertion rod 5 is pulled out of the connector 3, it is unlocked by the unlocking mechanism 6. One side of the bottom of the connector 3 is connected to the other end of the chain 1.
[0016] Specifically, the explanation is as follows: The connector 3 includes: a pin 3.1, a channel steel 3.2, and a lifting ring 3.3; the pin 3.1 is used to insert into the insertion hole 2.1, and the top of the pin 3.1 is fixed with a 45° channel steel 3.2. The lifting ring 3.3 is fixed on one side of the channel steel 3.2. In actual application, the lifting ring 3.3 is connected to the other end of the iron chain 1. The connector 3 and the iron chain 1 are placed in the track trench. The purpose is to facilitate the insertion rod 5 to be directly inserted into the channel steel 3.2 from the outside of the track, thereby avoiding the workers from entering the track trench and improving the safety of the operation.
[0017] To prevent people from entering the track trench while ensuring that the insertion rod 5 can be quickly locked into the channel steel 3.2, an elastic locking mechanism 4 is provided at the top of the channel steel 3.2. This elastic locking mechanism 4 includes: a U-shaped plate 4.1 and a trapezoidal locking block 4.2, a limiting plate 4.3, a sliding column 4.4, and a first compression spring 4.5, which are sequentially fixedly connected. The U-shaped plate 4.1 is fixed to the top of the channel steel 3.2, and a first limiting hole 4.11 is provided in the middle of the U-shaped plate 4.1. A rectangular groove 3.21 corresponding to the first limiting hole 4.11 is provided on the upper surface of the top of the channel steel 3.2. The trapezoidal locking block 4.2 is slidably disposed within the rectangular groove 3.21. With the inclined surface of 2 facing outward, the limiting plate 4.3 moves between the channel steel 3.2 and the U-shaped plate 4.1. The sliding column 4.4 slides through the first limiting hole 4.11. A first compression spring 4.5 is sleeved on the sliding column 4.4. One end of the first compression spring 4.5 abuts against the limiting plate 4.3, and the other end of the first compression spring 4.5 abuts against the lower surface of the middle part of the U-shaped plate 4.1, so that the trapezoidal block 4.2 is inserted into the top of the channel steel 3.2 under the action of the first compression spring 4.5.
[0018] To facilitate quick insertion and disassembly of the insertion rod 5 within the channel steel 3.2, the insertion rod 5 was designed as follows: The insertion rod 5 includes a round tube 5.1, a connector 5.2, and an insertion block 5.3. The round tube 5.1 is used for handheld operation by the worker, utilizing its length for ease of handling. One end of the round tube 5.1 has an internal thread, and this end is threadedly connected to the connector 5.2. The connector 5.2 and the insertion block 5.3 are fixedly connected by bolts. Specifically, the connector 5.2 includes an externally threaded tube 5.21, a square plate 5.22, and a rectangular slide rod 5.23, which are sequentially fixedly connected. One end of the externally threaded tube 5.21 is threadedly connected to the round tube 5.1. Two symmetrically symmetrically oriented receiving grooves 5.211 are formed in the middle of the externally threaded tube 5.21. Two symmetrically symmetrically oriented first through holes 5.221 corresponding to the receiving grooves 5.211 are formed on the square plate 5.22 and the rectangular slide rod 5.23. One end of the insertion block 5.3 has two through holes 5.221 corresponding to the first through holes 5.211. The threaded hole 5.32 corresponding to 221 is used to thread the bolt through the first through hole 5.221 and connect it to the threaded hole 5.32. The purpose is to place the bolt to fix the connector 5.2 and the insert 5.3 together. Two right-angled triangular prisms 5.31 with chamfers 6.421 are symmetrically fixed on the upper and lower sides of one end of the insert 5.3. The two perpendicular surfaces of the right-angled triangular prisms 5.31 have one side that coincides with the end face of the insert 5.3 and the other side that coincides with the outer upper surface of the insert 5.3. When the insert block 5.3 on the insert rod 5 is inserted into the channel steel 3.2, the trapezoidal locking block 4.2 slides upward along the rectangular groove 3.21, allowing the insert block 5.3 to continue to be inserted. When the square plate 5.22 and the upper end face of the channel steel 3.2 abut, the outer edge of the right-angled triangular prism 5.31 is movably locked with the surface of the trapezoidal locking block 4.2. At this time, the insert block 5.3 is just locked by the trapezoidal locking block 4.2 and cannot be pulled out, thus realizing the function of quick insertion.
[0019] After the connecting rod 2 of the connecting piece 3 and the lifting cart 7 are connected and fixed, since the lifting cart 7 needs to move with the track, the insertion rod 5 must be able to be pulled out from the channel steel 3.2. At the same time, it is also necessary to ensure that the operators are away from the track trench. Therefore, an unlocking mechanism 6 must be set inside the insertion rod 5 to ensure that the insertion rod 5 can be pulled out from the channel steel 3.2 quickly.
[0020] Specifically, the unlocking mechanism 6 comprises: a manual push tube 6.1, a short rod 6.2, a push rod 6.3, an unlocking slider 6.4, and a second compression spring 6.5; two limiting sliding chutes 5.11 are symmetrically formed on the circular tube 5.1, a limiting groove 5.231 is horizontally formed in the middle of the rectangular sliding rod 5.23, a second through hole 5.222 is formed at the center of the square plate 5.22, the second through hole 5.222 communicates with the limiting groove 5.231, two third through holes 6.11 are symmetrically formed on the manual push tube 6.1, the manual push tube 6.1 is slidably sleeved on the circular tube 5.1, the short rod 6.2 is slidably arranged through the two limiting sliding chutes 5.11 on the circular tube 5.1, both ends of the short rod 6.2 are fixedly arranged through the two third through holes 6.11 on the manual push tube 6.1, the middle part of the short rod 6.2 is vertically fixed to one end of the push rod 6.3, the other end of the push rod 6.3 passes through the second through hole 5.222 to abut against the middle part of the transverse bar 6.41 on the unlocking slider 6.4, the unlocking slider 6.4 is in a shape of the Chinese character "ri", comprising the transverse bar 6.41 and a rectangular frame 6.42 fixed to the outer side of the transverse bar 6.41, the transverse bar 6.41 slides on the limiting groove 5.231, the rectangular frame 6.42 is slidably sleeved on the outer side of the rectangular sliding rod 5.23, the second compression spring 6.5 is placed in the hole groove 5.33 on the insert block 5.3, one end of the second compression spring 6.5 abuts against the transverse bar 6.41, the other end of the second compression spring 6.5 abuts against the bottom end of the hole groove 5.33, a chamfer 6.421 is formed on one side edge of the outer frame of the rectangular frame 6.42; when the inclined surface of the right-angle triangular prism 5.31 is attached to the inclined surface of the unlocking slider 6.4, the trapezoidal clamping block 4.2 is no longer placed in the channel steel 3.2, thereby realizing the unlocking function. The width of the inclined surface of the chamfer 6.421, the width of the inclined surface of the trapezoidal clamping block 4.2, and the width of the inclined surface of the right-angle triangular prism 5.31 are equal, and the inclined surface of the chamfer 6.421 on one side of the rectangular frame 6.42 is in sliding fit with the inclined surface of the trapezoidal clamping block 4.2.
[0021] The function of the second compression spring 6.5 is mainly to reset the unlocking slider 6.4. The elastic force of the second compression spring 6.5 is used to push the unlocking slider 6.4, so that the inclined surface of the unlocking slider 6.4 is not attached to the inclined surface of the right-angle triangular prism 5.31, thereby facilitating the insertion of the trapezoidal clamping block 4.2 into the channel steel 3.5 to realize the locking function.
[0022] Working principle of the unlocking mechanism 6: During unlocking, the manual push tube 6.1 is slid downwards along the circular tube 5.1, simultaneously driving the short rod 6.2, push rod 6.3, and unlocking slider 6.4 downwards. The second compression spring 6.5 is gradually compressed. When the chamfer 6.421 on the unlocking slider 6.4 moves downwards, it drives the trapezoidal block 4.2 on the locking mechanism 4 to slide upwards into the rectangular groove 3.21, thus unlocking. At this time, the chamfer 6.421 on the unlocking slider 6.4 and the chamfer 5.31 of the right-angled triangular prism 5.31 are in contact. The unlocking slider 6.4 and the insert 5.3 are also in close contact, causing the trapezoidal block 4.2 to exit from the channel steel 3.5. This allows the locking slider 6.4 and the insert 5.3 to be pulled out directly from the inserted channel steel 3.5, that is, the insert rod 5 is pulled out from the inserted channel steel 3.5.
[0023] In actual production, connector 3 and chain 1 are connected together and placed in the track trench. When connecting connector 3 and connecting rod 2, the method of using this device is as follows: Step 1: Hold the round tube 5.1 firmly with both hands, align the insert block 5.3 with the channel steel 3.2 on the connector 3, and then insert it until the square plate 5.22 abuts against the end face of the channel steel 3.2. At this time, the trapezoidal locking block 4.2 will lock between the rectangular frame 6.42 and the right-angled triangular prism 5.31, so that the insert rod 5 and the connector 3 are connected, locked and fixed. Step 2: Hold the insertion rod 5 and insert the pin 3.1 on the connector 3 into the insertion hole 2.1 to complete the locking connection.
[0024] Step 3: After connecting, hold the manual push tube 6.1 firmly with one hand and slide it down along the round tube 5.1, so that the short rod 6.2 slides down along the limiting slide groove 5.11 and pushes the push rod 6.3 to move down. The other end of the push rod 6.3 pushes the unlocking slider 6.4 to slide down, which drives the trapezoidal block 4.2 on the elastic locking mechanism 4 to slide up into the rectangular groove 3.21, thus unlocking. Then, simply pull out the plug rod 5.
[0025] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. An auxiliary device for facilitating the lifting of a cart and quick connection of a chain, comprising an iron chain (1) and a connecting rod (2), wherein the connecting rod (2) is provided with a vertical insertion hole (2.1), and one end of the iron chain (1) is connected to a steel wire rope, characterized in that, It also includes a connector (3), an elastic locking mechanism (4), a plug (5), and an unlocking mechanism (6); the connector (3) is movably inserted into the connecting rod (2), the connector (3) is provided with an elastic locking mechanism (4) at the top, the plug (5) is inserted into the connector (3) and locked by the elastic locking mechanism (4), the plug (5) is provided with an unlocking mechanism (6), the plug (5) is unlocked by the unlocking mechanism (6) when it is pulled out from the connector (3), and the bottom side of the connector (3) is connected to the other end of the chain (1); The connector (3) includes: a pin (3.1), a channel steel (3.2), and a lifting ring (3.3); the top of the pin (3.1) is fixed with a channel steel (3.2) at a 45° angle, the pin (3.1) is inserted into the insertion hole (2.1) on the connecting rod (2), the lifting ring (3.3) is fixed on one side of the channel steel (3.2), and the lifting ring (3.3) is connected to the other end of the chain (1).
2. The auxiliary device for facilitating the lifting of carts and quick connection of chains according to claim 1, characterized in that, The elastic locking mechanism (4) includes: a U-shaped plate (4.1) and a trapezoidal locking block (4.2), a limiting plate (4.3), a sliding column (4.4), and a first compression spring (4.5) connected in sequence; the U-shaped plate (4.1) is fixed to the top of the channel steel (3.2), and a first limiting hole (4.11) is provided in the middle of the U-shaped plate (4.1). A rectangular groove (3.21) corresponding to the first limiting hole (4.11) is provided on the upper surface of the top of the channel steel (3.2). The trapezoidal locking block (4.2) is slidably positioned... The trapezoidal block (4.2) is placed in a rectangular groove (3.21), with its inclined surface facing outward. The limiting plate (4.3) moves between the channel steel (3.2) and the U-shaped plate (4.1). The sliding column (4.4) slides through the first limiting hole (4.11). A first compression spring (4.5) is sleeved on the sliding column (4.4). One end of the first compression spring (4.5) abuts against the limiting plate (4.3), and the other end of the first compression spring (4.5) abuts against the lower surface of the middle part of the U-shaped plate (4.1).
3. The auxiliary device for facilitating the lifting of carts and quick connection of chains according to claim 2, characterized in that, The insertion rod (5) includes: a round tube (5.1), a connector (5.2), and an insertion block (5.3); one end of the round tube (5.1) is provided with an internal thread, one end of the round tube (5.1) is threadedly connected to the connector (5.2), and the connector (5.2) and the insertion block (5.3) are fixedly connected by bolts.
4. The auxiliary device for facilitating the lifting of carts and quick connection of chains according to claim 3, characterized in that, The connector (5.2) includes an externally threaded pipe (5.21), a square plate (5.22), and a rectangular slide rod (5.23) that are fixedly connected in sequence; one end of the externally threaded pipe (5.21) is threadedly connected to the round pipe (5.1); two receiving grooves (5.211) are symmetrically opened in the middle of the externally threaded pipe (5.21); two first through holes (5.221) corresponding to the receiving grooves (5.211) are symmetrically opened on the square plate (5.22) and the rectangular slide rod (5.23); and a limiting groove is horizontally opened in the middle of the rectangular slide rod (5.23). 5.231), a second through hole (5.222) is opened at the center of the square plate (5.22), and the second through hole (5.222) is in communication with the limiting groove (5.231).
5. The auxiliary device for facilitating the lifting of carts and quick connection of chains according to claim 4, characterized in that, Two right-angle triangular prisms (5.31) are symmetrically fixed on the upper and lower sides of one end of the insert block (5.3), two threaded holes (5.32) corresponding to the first through holes (5.221) are opened at one end of the insert block (5.3), bolts pass through the first through holes (5.221) to be in threaded connection with the threaded holes (5.32), a hole groove (5.33) is opened at the center of one end of the insert block (5.3), the insert block (5.3) is inserted into the channel steel (3.2), and the outer edges of the right-angle triangular prisms (5.31) are movably clamped with the surface of the trapezoidal clamping block (4.2).
6. The auxiliary device for facilitating the lifting of carts and quick connection of chains according to claim 5, characterized in that, The unlocking mechanism (6) comprises: a manual push tube (6.1), a short rod (6.2), a push rod (6.3), an unlocking slider (6.4) and a second compression spring (6.5); two limiting chutes (5.11) are symmetrically opened on the circular tube (5.1), two third through holes (6.11) are symmetrically opened on the manual push tube (6.1), the manual push tube (6.1) is slidably sleeved on the circular tube (5.1), the short rod (6.2) is slidably arranged through the two limiting chutes (5.11) on the circular tube (5.1), both ends of the short rod (6.2) are fixedly arranged through the two third through holes (6.11) on the manual push tube (6.1), the middle part of the short rod (6.2) is vertically fixed to one end of the push rod (6.3), the other end of the push rod (6.3) passes through the second through hole (5.222) to abut against the middle part of the transverse strip (6.41) on the unlocking slider (6.4), the unlocking slider (6.4) is of a "day"-shaped structure, comprising the transverse strip (6.41) and a rectangular frame (6.42) fixed on the outer side of the transverse strip (6.41), the transverse strip (6.41) slides on the limiting groove (5.231), the rectangular frame (6.42) is slidably sleeved on the outer side of the rectangular sliding rod (5.23), the second compression spring (6.5) is placed in the hole groove (5.33) on the insert block (5.3), one end of the second compression spring (6.5) abuts against the transverse strip (6.41), the other end of the second compression spring (6.5) abuts against the bottom end of the hole groove (5.33), and a chamfer (6.421) is opened on one side edge of the outer frame of the rectangular frame (6.42).
7. The auxiliary device for facilitating the lifting of carts and quick connection of chains according to claim 6, characterized in that, The slope width of the chamfer (6.421), the slope width of the trapezoidal clamping block (4.2) and the slope width of the right-angle triangular prism (5.31) are equal, and the slope of the chamfer (6.421) on one side of the rectangular frame (6.42) is in sliding fit with the slope of the trapezoidal clamping block (4.2).