Open type hook lifting rod seat with locking function

Abstract

The application discloses an open type hook lifting rod seat with locking function and belongs to the technical field of railway vehicles, which comprises a seat body, a first locking mechanism and a second locking mechanism. An open slot is arranged on the seat body for putting or taking out the hook lifting rod. The open slot comprises a U-shaped slot and a flat slot. The U-shaped slot is located above the flat slot and is communicated with the flat slot. The first locking mechanism is arranged above the U-shaped slot and is used for closing or opening the upper side of the U-shaped slot so as to limit or allow the hook lifting rod to be taken out from above the open slot. The second locking mechanism is laterally arranged on the upper part of the flat slot and is used for closing or opening the channel between the flat slot and the U-shaped slot so as to prevent or allow the hook lifting rod to enter the U-shaped slot from the flat slot. The application can prevent the hook lifting rod from jumping into the U-shaped slot and causing accidental unlocking, is simple to operate, does not need to disassemble the seat body, has high maintenance efficiency and is safe to use.

Description

Technical Field

[0001] This invention belongs to the field of railway vehicle technology, and specifically relates to an open-type hook lifting rod seat with locking function. Background Technology

[0002] Railway freight cars are coupled and decoupled using couplers. The coupler has three working positions: locked, unlocked, and fully open (three states). The operator rotates the coupler lifting rod, which actuates the locking pin mechanism inside the coupler, causing the coupler tongue to rotate and thus unlocking or coupling the car. The coupler lifting rod device generally consists of a coupler lifting rod, a coupler lifting rod seat, and a coupler lifting rod seat base plate. The coupler lifting rod seat base plate is welded to the end beam of the freight car, and the coupler lifting rod passes through the hole in the coupler lifting rod seat and connects to the coupler. The lower-acting coupler lifting rod has an L-shaped handle at one end and a U-shaped hook head at the other, with the middle section bent according to obstacle avoidance requirements.

[0003] Current hook-lift rod seats are generally closed structures with a mounting hole in the center. The hook-lift rod passes through the mounting hole and is then fixed to the base plate using fasteners. The part of the hook-lift rod that mates with the hook-lift rod seat is machined into a flat shape, which mates with the flat hole at the bottom of the mounting hole to restrict the hook-lift rod's rotation around its center. When the coupler needs to be unlocked, the operator lifts the hook-lift rod to the area of ​​the round hole above the keyhole, allowing the hook-lift rod to rotate freely and unlock the coupler. However, when this type of closed hook-lift rod seat needs to be replaced or repaired, the entire hook-lift rod seat must be removed from the vehicle body before the hook-lift rod can be taken out. This cumbersome disassembly and assembly process results in low maintenance efficiency and long operation time.

[0004] To overcome the aforementioned shortcomings, existing technologies have proposed a hook-lifting rod seat with an opening at the upper end of the seat body, allowing the hook-lifting rod to be directly inserted or removed through the notch without disassembling the hook-lifting rod seat. However, the U-shaped hole area below the opening in this seat body is relatively large. Under the influence of vibrations from long-term vehicle operation, the hook-lifting rod may jump from the flat hole into the U-shaped hole area, posing a risk of accidental unlocking. Furthermore, due to the large space in the U-shaped hole area, once the hook-lifting rod jumps in, it can rotate freely without effective restraint, further exacerbating the safety hazard. Therefore, there is an urgent need for an open-type hook-lifting rod seat with a locking function that can solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned shortcomings by providing an open-type hook lifting rod holder with a locking function, aiming to solve the problem that the hook lifting rod is prone to accidental unlocking due to jumping holes in current open-type hook lifting rod holders. To achieve the above objective, this invention provides the following technical solution: An open-type hook lifting rod holder with a locking function includes a base body, a first locking mechanism, and a second locking mechanism. The base body has an open slot for inserting or removing the hook lifting rod. The open slot includes a U-shaped slot and a flat slot. The U-shaped slot is located above the flat slot and communicates with it. The first locking mechanism is located above the U-shaped slot and is used to close or open the upper side of the U-shaped slot to restrict or allow the hook lifting rod to come out from above the open slot. The second locking mechanism is laterally located on the upper part of the flat slot and is used to close or open the channel between the flat slot and the U-shaped slot to prevent or allow the hook lifting rod to enter the U-shaped slot from the flat slot.

[0006] Furthermore, the first locking mechanism includes a round pin and a cotter pin; the base has round pin holes on both the left and right sides located at the top of the U-shaped groove, the round pin passes through the two round pin holes and is locked by the cotter pin.

[0007] Furthermore, the second locking mechanism includes a stop bar, a spring, and a plug; the seat body has a mounting hole on the right side wall located at the upper part of the flat groove; the front end of the stop bar extends into the flat groove through the mounting hole; the plug is detachably installed on the outside of the mounting hole; the spring is located between the stop bar and the plug, and is used to keep the stop bar in a horizontal leftward elastic tendency.

[0008] Furthermore, the mounting hole includes a plug-in hole section, a transition hole section, and a screw-in hole section connected sequentially from left to right; the plug-in hole section is a variable diameter section; the diameter of the front end of the transition hole section is larger than the diameter of the plug-in hole section, and the diameter of the rear end of the plug-in hole section is not larger than the diameter of the screw-in hole section; a retaining ring is provided in the middle of the stop bar; the diameter of the retaining ring is larger than that of the plug-in hole section.

[0009] Furthermore, the plug has a receiving cavity; the spring is sleeved on the outer peripheral wall of the stop rod located on the right side of the snap ring, and its left and right ends respectively elastically abut against the stop rod and the inner wall of the receiving cavity.

[0010] Furthermore, the outer wall of the plug is provided with external threads; the screw-in hole section is provided with internal threads that mate with the external threads, so that the plug is installed in the mounting hole by screwing in the threads.

[0011] Furthermore, the second locking mechanism also includes an adjusting pad, which is disposed on the inner wall of the receiving cavity.

[0012] Furthermore, the base is also provided with a drainage hole; the drainage hole extends from the bottom of the base into the transition hole section of the mounting hole.

[0013] Furthermore, the width of the flat groove is greater than the width of the flat part of the hook lifting rod, and the width difference is between 2mm and 4mm.

[0014] Furthermore, it also includes a baffle; the upper part of the U-shaped groove has a slot; the baffle is detachably installed in the U-shaped groove through the slot; the baffle has an arc-shaped hole, and the arc-shaped hole and the lower part of the U-shaped groove together form a non-enclosed circular movable space for the hook lifting rod to rotate.

[0015] The beneficial effects of this invention are: 1. This invention solves the safety hazard of accidental unlocking caused by the hook rod jumping into the U-shaped groove due to vehicle vibration when a second locking mechanism is set between the flat groove and the U-shaped groove of the seat body. At the same time, the compression of the spring can be adjusted to adapt to different models of hook rods by setting a second locking mechanism between the flat groove and the U-shaped groove of the seat body.

[0016] 2. By setting a detachable baffle, the present invention forms a circular movable space within the U-shaped groove together with the lower part of the U-shaped groove, allowing the hook lifting rod to rotate freely. The rotation trajectory of the hook lifting rod is constrained within this space. Even if the baffle fails due to an accident, the hook lifting rod will not sway irregularly over a wide range within the U-shaped groove, ensuring the safety of use during vehicle operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ; Figure 2 This is a partial cross-sectional view of the present invention, and the second locking mechanism is shown; Figure 3 This is a partial cross-sectional view of the present invention, and the second locking mechanism is not shown; Figure 4 This is a cross-sectional view of the second locking mechanism of the present invention; Figure 5 This is a schematic diagram showing the scenario where the hook lifting rod of the present invention is located in the U-shaped groove and the flat groove respectively; In the attached diagram: 1. Base; 2. First locking mechanism; 3. Second locking mechanism; 4. Baffle; 5. Hook lifting rod; 6. Base plate; 11. U-shaped groove; 12. Flat groove; 13. Round pin hole; 14. Mounting hole; 15. Drain hole; 16. Slot; 21. Round pin; 22. Cotter pin; 31. Stop bar; 32. Spring; 33. Plug; 34. Adjusting shim; 41. Arc-shaped hole; 141. Insertion hole section; 142. Transition hole section; 143. Screw-in hole section; 311. Snap-fit ​​ring; 331. Receiving cavity. Detailed Implementation

[0018] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0019] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0020] In the description of this invention, "a plurality of" means two or more.

[0021] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0022] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0023] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," and "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the present invention is not limited to the following embodiments.

[0025] Example 1: See attached Figure 1 , 5An open-type hook lifting rod holder with a locking function includes a base body 1, a first locking mechanism 2, and a second locking mechanism 3. The base body 1 is provided with an open slot for inserting or removing a hook lifting rod 5. The open slot includes a U-shaped slot 11 and a flat slot 12. The U-shaped slot 11 is located above the flat slot 12 and communicates with it. The first locking mechanism 2 is located above the U-shaped slot 11 and is used to close or open the upper side of the U-shaped slot 11 to restrict or allow the hook lifting rod 5 to come out from above the open slot. The second locking mechanism 3 is laterally located on the upper part of the flat slot 12 and is used to prevent or allow the hook lifting rod 5 to enter the U-shaped slot 11 from the flat slot 12.

[0026] As can be seen from the above structure, the base 1 is provided with an opening slot that extends upward through the upper end of the base 1, allowing the hook lifting rod 5 to be directly inserted into or removed from the base 1 from above without disassembling the base 1, thus greatly improving maintenance efficiency. The opening slot includes a U-shaped slot 11 and a flat slot 12, with the U-shaped slot 11 located above the flat slot 12 and the two communicating with each other. The diameter of the U-shaped slot 11 is larger than the maximum cross-sectional profile of the hook lifting rod 5, and the flat slot 12 is an elongated hole whose width is adapted to the flat part of the hook lifting rod 5, facilitating the insertion of the hook lifting rod 5.

[0027] The first locking mechanism 2 is located on the upper side of the U-shaped groove 11. During vehicle operation, the first locking mechanism 2 closes the upper end of the U-shaped groove 11, restricting the hook lifting rod 5 within the U-shaped groove 11 and preventing it from accidentally coming out. When it is necessary to remove the hook lifting rod 5, the first locking mechanism 2 opens the upper end of the U-shaped groove 11, allowing the hook lifting rod 5 to be removed from the upper end of the U-shaped groove 11, meeting maintenance needs. The second locking mechanism 3 is laterally located on the upper part of the flat groove 12 and is used to limit the hook lifting rod 5. During vehicle operation, the second locking mechanism 3 blocks the hook lifting rod 5, restricting it within the flat groove 12 and preventing it from moving significantly, thereby preventing the hook lifting rod 5 from jumping into the U-shaped groove 11 due to vibration. When it is necessary to remove the hook lifting rod 5, open the channel between the flat groove 12 and the U-shaped groove 11, and lift the hook lifting rod 5 upwards so that the hook lifting rod 5 can enter the U-shaped groove 11 and finally be taken out from the upper end of the opened U-shaped groove 11. The operation is simple and the use is stable.

[0028] In addition, it should be noted that the appendix Figure 5 a represents the movement of the hook lifting rod 5 into the U-shaped groove 11, within the non-enclosed circular active space. (See attached image.) Figure 5 b shows the movement of the hook lifting rod 5 inside the flat groove 12. (See attached diagram) Figure 5 The image also shows a base plate 6, which is welded to the steel structure of the vehicle body. The left side of the seat 1 is fixedly installed on the base plate 6 by fasteners, thus fixing it to the vehicle.

[0029] The working process of this hook lifting rod seat is as follows: When installing the hook lifting rod 5, the first locking mechanism 2 does not close the upper side of the U-shaped groove 11. The hook lifting rod 5 can be directly inserted into the flat groove 12 from the opening slot at the upper end of the base 1, and the hook lifting rod 5 is limited by the second locking mechanism 3. The flat groove 12 cooperates with the flat part of the hook lifting rod 5 at this time, restricting the hook lifting rod 5 from rotating significantly around the center of the rod, thereby preventing the hook lifting rod 5 from jumping into the U-shaped groove 11 under vibration. When it is necessary to unlock the coupler, the second locking mechanism 3 releases the restriction on the hook lifting rod 5 and opens the upper side of the U-shaped groove 11. At this time, the hook lifting rod 5 is lifted upwards, and after the hook lifting rod 5 enters the U-shaped groove 11, it can rotate freely, making it easy for the operator to remove it and complete the coupler unlocking.

[0030] The open-type hook lifting rod seat provided in this embodiment achieves double locking of the hook lifting rod 5 by setting a first locking mechanism 2 and a second locking mechanism 3. This not only prevents the hook lifting rod 5 from accidentally coming out from above the open slot, but also prevents the hook lifting rod 5 from jumping into the U-shaped groove 11 due to vibration, which could cause safety problems. Furthermore, the present invention has a simple structure, and the installation and disassembly of the hook lifting rod 5 are convenient without disassembling the seat body 1, which can also greatly improve maintenance efficiency.

[0031] Example 2: See attached Figures 1-5 Based on Embodiment 1, the first locking mechanism 2 includes a round pin 21 and a cotter pin 22; the base 1 has round pin holes 13 on both the left and right sides at the top of the U-shaped groove 11, and the round pin 21 passes through the two round pin holes 13 and is locked by the cotter pin 22. As can be seen from the above structure, the first locking mechanism 2 is located above the U-shaped groove 11 and includes a round pin 21 and a cotter pin 22. Normally, the round pin 21 spans across the upper end of the U-shaped groove 11 to close the U-shaped groove 11 and prevent the hook lifting rod 5 from disengaging from above the opening. When it is necessary to remove the hook lifting rod 5, the upper end of the U-shaped groove 11 can be opened by pulling out the cotter pin 22 and the round pin 21, making the operation simple and quick.

[0032] The second locking mechanism 3 includes a stop bar 31, a spring 32, and a plug 33. The base 1 has a mounting hole 14 on its right side wall above the flat groove 12. The front end of the stop bar 31 extends into the flat groove 12 through the mounting hole 14. The plug 33 is detachably mounted on the outside of the mounting hole 14. The spring 32 is located between the stop bar 31 and the plug 33, used to maintain the stop bar 31's elastic tendency to move horizontally to the left. As can be seen from the above structure, the base 1 has a mounting hole 14 on its right side wall above the flat groove 12. The mounting hole 14 penetrates the side wall of the base 1 horizontally and communicates with the flat groove 12. The stop bar 31 is movably mounted in the mounting hole 14, with its front end extending into the channel between the flat groove 12 and the U-shaped groove 11 through the mounting hole 14, used to physically block the hook lifting rod 5 from continuing upward, thereby preventing the hook lifting rod 5 from entering the U-shaped groove 11 from the flat groove 12. Furthermore, under the action of spring 32, the stop rod 31 will remain inserted into the flat groove 12 and stop at the connection between the flat groove 12 and the U-shaped groove 11. The plug 33 is fixed to the outer end of the mounting hole 14 by a threaded connection, used to encapsulate the spring 32 and the stop rod 31 within the mounting hole 14. (According to the attached...) Figure 2 , 4 It is known that the front end of the stop bar 31 is an arc surface, which can maintain a sufficient blocking area when in contact with the hook lifting rod 5, and prevent damage to the hook lifting rod 5 or the stop bar 31 due to collision. When it is necessary to remove the hook lifting rod 5, the elastic tendency maintained by the stop bar 31 can be released by removing the plug 33, so that the hook lifting rod 5 can smoothly enter the U-shaped groove 11.

[0033] The mounting hole 14 includes a plug-in hole section 141, a transition hole section 142, and a screw-in hole section 143 connected sequentially from left to right; the plug-in hole section 141 is a variable diameter section; the diameter of the front end of the transition hole section 142 is larger than the diameter of the plug-in hole section 141, and the diameter of the rear end of the plug-in hole section 141 is not larger than the diameter of the screw-in hole section 143; the stop bar 31 is provided with a snap-fit ​​ring 311 in the middle; the diameter of the snap-fit ​​ring 311 is larger than that of the plug-in hole section 141. As can be seen from the above structure, the mounting hole 14 includes a plug-in hole section 141, a transition hole section 142, and a screw-in hole section 143 connected sequentially from left to right. The plug-in hole section 141 is used to allow the front end of the stop rod 31 to pass through and extend into the flat groove 12. The transition hole section 142 is used to cooperate with the snap ring 311. The diameter of the snap ring 311 is larger than the diameter of the hole of the plug-in hole section 141 of the mounting hole 14, which is used to limit the extension of the stop rod 31 and prevent the entire stop rod 31 from falling into the flat groove 12. The screw-in hole section 143 is used to cooperate with the plug 33, so that the plug 33 can be detachably installed in the screw-in hole section 143.

[0034] The plug 33 has a receiving cavity 331; the spring 32 is sleeved on the outer peripheral wall of the stop rod 31 located on the right side of the snap ring 311, and its left and right ends elastically abut against the stop rod 31 and the inner wall of the receiving cavity 331, respectively. As can be seen from the above structure, the receiving cavity 331 extends axially along the plug 33 to accommodate the spring 32 and the stop rod 31. The spring 32 is sleeved on the outer peripheral wall of the stop rod 31 located on the right side of the snap ring 311, with its left end abutting against the right end face of the snap ring 311 and its right end abutting against the bottom inner wall of the receiving cavity 331. This arrangement ensures that the spring 32 always pushes the snap ring 311 against the front end of the transition hole section 142 and keeps the stop rod 31 tending to extend to the left. Furthermore, the receiving cavity 331 also provides sufficient compression and reset space for the spring 32. When the hook rod 5 pushes the stop rod 31 to retract to the right, the spring 32 is compressed between the snap ring 311 and the bottom wall of the receiving cavity 331, storing elastic potential energy. After the hook rod 5 returns to its original position, the spring 32 releases its potential energy and pushes the stop rod 31 to return to its original position to the left. In addition, the operator can adjust the compression of the spring 32 by adjusting the screw-in distance of the plug 33 relative to the screw-in hole section 143, thereby adjusting the elastic force on the stop rod 31, which facilitates blocking or allowing the hook rod 5 to pass over the flat groove 12 and enter the U-shaped groove 11.

[0035] The outer wall of the plug 33 is provided with external threads; the screw-in hole section 143 is provided with internal threads that mate with the external threads, so that the plug 33 is screwed into the mounting hole 14 by means of threaded connection. As can be seen from the above structure, the threaded connection makes the plug 33 less likely to loosen after installation, easy to disassemble and assemble, and allows for flexible adjustment of the compression potential energy of the spring 32 to ensure the blocking effect of the stop rod 31 on the hook lifting rod 5.

[0036] The second locking mechanism 3 also includes an adjusting pad 34, which is disposed on the inner wall of the receiving cavity 331. As can be seen from the above structure, with the adjusting pad 34 provided, the right end of the spring 32 abuts against the left side wall of the adjusting pad 34. This invention can also fine-tune the pre-compression of the spring 32 without changing its free length by selecting adjusting pads 34 of different thicknesses, thereby adjusting the resistance of the stop rod 31 to the hook lifting rod 5. Specifically, the adjusting pad 34 can be a metal shim, the shape of which is adapted to the internal shape of the receiving cavity 331.

[0037] Example 3: See attached Figures 1-5 Based on Embodiment 2, the base 1 is further provided with a drainage hole 15; the drainage hole 15 extends from the bottom of the base 1 into the transition hole section 142 of the mounting hole 14. As can be seen from the above structure, the drainage hole 15 can promptly drain water accumulated inside the mounting hole 14 due to rainwater or condensation, preventing water from remaining in the mounting hole 14 for a long time, which could cause the spring 32 to rust and fail or the stop bar 31 to become stuck. This effectively improves the reliability and service life of the second locking mechanism 3 in long-term use.

[0038] The width of the flat groove 12 is greater than the width of the flat portion of the hook lifting rod 5, and the width difference is between 2mm and 4mm. As can be seen from the above structure, this invention controls the width difference between the flat groove 12 and the hook lifting rod 5 to between 2mm and 4mm. This ensures that the hook lifting rod 5 has a certain gap within the flat groove 12 when passing through a curve, preventing jamming between the two, and also ensures that its rotation angle is always less than the critical angle required to unlock the coupler, thus eliminating the potential for accidental unlocking from a geometric perspective.

[0039] Preferably, the lower section of the flat groove 12 has an arc-shaped cross-section. This design also increases the swing angle of the hook rod within the flat hole, further preventing the hook rod 5 from getting stuck between the hook rod 5 and the flat groove 12 when the vehicle passes through curved road sections.

[0040] It also includes a baffle 4; a slot 16 is provided on the upper part of the U-shaped groove 11; the baffle 4 is detachably installed in the U-shaped groove 11 through the slot 16; the baffle 4 has an arc-shaped hole 41, and the arc-shaped hole 41 and the lower part of the U-shaped groove 11 together form a non-enclosed circular movable space for the hook lifting rod 5 to rotate. As can be seen from the above structure, the additional baffle 4 allows the hook lifting rod 5 to be constrained in this circular movable space when it is lifted into the U-shaped groove 11. Even if the baffle 31 fails unexpectedly, the hook lifting rod 5 will not swing irregularly over a wide range in the U-shaped groove 11 and accidentally unlock. When it is necessary to remove the hook lifting rod 5 for maintenance, first release the restriction of the baffle 31 on the hook lifting rod 5, then pull out the cotter pin 22 and the round pin 21 to open the top of the U-shaped groove 11, and finally remove the baffle 4, so that the hook lifting rod 5 can be easily removed.

[0041] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An open-type hook lifting rod seat with locking function, characterized in that: The device includes a base (1), a first locking mechanism (2), and a second locking mechanism (3). The base (1) has an opening slot for inserting or removing the hook rod (5). The opening slot includes a U-shaped slot (11) and a flat slot (12). The U-shaped slot (11) is located above the flat slot (12) and communicates with it. The first locking mechanism (2) is located above the U-shaped slot (11) and is used to close or open the upper side of the U-shaped slot (11) to restrict or allow the hook rod (5) to come out from above the opening slot. The second locking mechanism (3) is located laterally on the upper part of the flat slot (12) and is used to close or open the channel between the flat slot (12) and the U-shaped slot (11) to prevent or allow the hook rod (5) to enter the U-shaped slot (11) from the flat slot (12).

2. The open-type hook lifting rod seat according to claim 1, characterized in that: The first locking mechanism (2) includes a round pin (21) and a cotter pin (22); the seat (1) has round pin holes (13) on both the left and right sides at the top of the U-shaped groove (11), the round pin (21) passes through the two round pin holes (13) and is locked by the cotter pin (22).

3. The open-type hook lifting rod seat according to claim 1, characterized in that: The second locking mechanism (3) includes a stop bar (31), a spring (32) and a plug (33); the seat (1) has an installation hole (14) on the right side wall located above the flat groove (12); the front end of the stop bar (31) extends into the flat groove (12) through the installation hole (14); the plug (33) is detachably installed on the outside of the installation hole (14); the spring (32) is located between the stop bar (31) and the plug (33) to keep the stop bar (31) moving horizontally to the left with an elastic tendency.

4. The open-type hook lifting rod seat according to claim 3, characterized in that: The mounting hole (14) includes a plug-in hole section (141), a transition hole section (142), and a screw-in hole section (143) connected sequentially from left to right; the plug-in hole section (141) is a variable diameter section; the diameter of the front end of the transition hole section (142) is larger than the diameter of the plug-in hole section (141), and the diameter of the rear end of the plug-in hole section (141) is not larger than the diameter of the screw-in hole section (143); a snap-fit ​​ring (311) is provided in the middle of the stop bar (31); the diameter of the snap-fit ​​ring (311) is larger than that of the plug-in hole section (141).

5. The open-type hook lifting rod seat according to claim 4, characterized in that: The plug (33) has a receiving cavity (331); the spring (32) is sleeved on the outer peripheral wall of the stop rod (31) located on the right side of the snap ring (311), and its left and right ends are elastically abutting against the stop rod (31) and the inner wall of the receiving cavity (331) respectively.

6. The open-type hook lifting rod seat according to claim 4, characterized in that: The outer wall of the plug (33) is provided with an external thread; the screw-in hole section (143) is provided with an internal thread that mates with the external thread, so that the plug (33) is installed in the mounting hole (14) by screwing in the thread.

7. The open-type hook lifting rod seat according to claim 5, characterized in that: The second locking mechanism (3) also includes an adjusting pad (34), which is disposed on the inner wall of the receiving cavity (331).

8. The open-type hook lifting rod seat according to claim 4, characterized in that: The base (1) is also provided with a drainage hole (15); the drainage hole (15) extends from the bottom of the base (1) into the transition hole section (142) of the mounting hole (14).

9. The open-type hook lifting rod seat according to claim 1, characterized in that: The width of the flat groove (12) is greater than the width of the flat part of the hook lifting rod (5), and the width difference is between 2mm and 4mm.

10. The open-type hook lifting rod seat according to any one of claims 1 to 9, characterized in that: It also includes a baffle (4); a slot (16) is provided on the upper part of the U-shaped groove (11); the baffle (4) is detachably installed in the U-shaped groove (11) through the slot (16); an arc-shaped hole (41) is provided on the baffle (4), and the arc-shaped hole (41) and the lower part of the U-shaped groove (11) together form a non-enclosed circular movable space for the hook lifting rod (5) to rotate.

Images