Pipe section lock

Abstract

The utility model provides a kind of pipe joint lock, including lock body and mechanical blocking mechanism;Lock tongue is equipped in lock body for connecting adjacent pipe joint to lock together two adjacent pipe joints;When pipe joint lock is used, the contact connection relationship between mechanical blocking mechanism and lock body is established and removed to generate the driving force of lock tongue horizontal movement in lock body to promote lock tongue to control the connection and disconnection of two adjacent pipe joints.The pipe joint lock provided by the utility model is used to connect pipe joints together, which can replace the remaining lead screws in the lifting rod except the bottommost lead screw, greatly reducing the weight of the lifting rod, solving the problem of heavy weight and high manufacturing cost of the existing electric lifting rod.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission, and more specifically, to a pipe joint lock. Background Technology

[0002] Currently, most electric lifting masts use multi-section lead screw drives to ensure smooth lifting and closing, with synchronous lifting. The working principle is as follows: when the mast is closed, all lead screw sections and their nuts are engaged. Upon energization, the geared motor transmits power to the lead screws via a gear pair. The bottom lead screw section drives the remaining lead screws to rotate synchronously via a spline. As each lead screw section rotates synchronously, it unfolds relative to the others. Each section has a nut fixed at its bottom; when the lead screw rotates, it pushes the nut upward, thus unfolding the sections relative to each other. When the mast is in the lifting state, the geared motor rotates in the opposite direction, and the lead screws rotate synchronously and close relative to each other, dragging the nut downward, thus closing the sections relative to each other. In the locked state, the threaded engagement between the lead screw and nut achieves mechanical self-locking through friction.

[0003] The above-mentioned mechanical structure and technical characteristics have led to the problems of heavy weight and high cost of traditional electric lifting poles. Therefore, it is necessary to provide a pipe section lock to solve the problems existing in the prior art. Utility Model Content

[0004] The main objective of this invention is to provide a pipe section lock, which at least solves the problems of large weight and high manufacturing cost of electric lifting rods in the prior art.

[0005] To achieve the above objectives, this utility model provides a pipe section lock, including a lock body and a mechanical blocking mechanism; the lock body includes a first clamp and a lock cylinder assembly; the first clamp is fixedly sleeved on the top end of the second pipe section; the lock cylinder assembly is disposed inside the first clamp and is used to lock or unlock the first and second pipe sections; the mechanical blocking mechanism is fixedly installed on the top end of the third pipe section; wherein, a sleeve is provided at the bottom end of the first pipe section, and a tapered hole is opened on the sleeve; the lock cylinder assembly locks or unlocks the first and second pipe sections by separating or connecting the lock body and the mechanical blocking mechanism to insert or withdraw from the tapered hole of the sleeve of the first pipe section.

[0006] Furthermore, there are two lock cylinder assemblies, which are symmetrically installed within the first clamp along the radial direction of the first clamp.

[0007] Furthermore, the lock cylinder assembly includes a bolt assembly and a stop assembly; wherein, the bolt assembly is nested inside the first clamp and is used to insert into or exit the tapered hole; the stop assembly is nested inside the first clamp and is used to cooperate with the bolt assembly.

[0008] Furthermore, the first clamp has two horizontally symmetrically formed strip slots; the locking tongue assembly includes a locking tongue and a first spring; the locking tongue is inserted into the corresponding strip slot, the first end of the locking tongue is a tapered surface that matches the tapered hole, and a protruding ridge is provided between the second end of the locking tongue and the bottom of the corresponding strip slot; the first spring is sleeved on the locking tongue and is located between the bottom of the strip slot and the protruding ridge; wherein, when the second end of the locking tongue is subjected to force, the locking tongue moves horizontally towards the central axis of the first pipe section until the first end of the locking tongue is inserted into the tapered hole, and the first spring is compressed; when the pressure on the second end of the locking tongue is released, the compressed first spring pushes the protruding ridge to make the locking tongue move horizontally in the opposite direction until the first end of the locking tongue leaves the tapered hole.

[0009] Furthermore, the limiting sub-assembly includes a second spring and a slider; the top end of the second spring is connected inside the first clamp; the top end of the slider is connected to the bottom end of the second spring, and the slider is used to lock the latch at the position of insertion into the tapered hole; wherein, when the bottom end of the slider is subjected to force, the slider slides upward inside the first clamp, and the second spring is compressed; when the pressure at the bottom end of the slider is released, the compressed second spring pushes the slider downward to contact the latch, thereby locking the latch at the position of insertion into the tapered hole.

[0010] Furthermore, the mechanical blocking mechanism includes a second clamp and a stop block. The second clamp is fixedly sleeved on the top end of the third pipe section. There are two stops, which are symmetrically fixed on the top end of the second clamp along the radial direction of the second clamp, and are used to cooperate with the lock cylinder assembly to lock or unlock the first pipe section and the second pipe section.

[0011] Furthermore, the stop block has a groove, which includes a sloping section and a vertical section connected in sequence. The sloping section slopes inward from top to bottom, and the vertical section is located at the lower end of the sloping section. When the bottom end of the first tube section is lower than the top end of the second tube section, the stop block is used to push the slider upward and accommodate the second end of the latch propelled out by the first spring. When the bottom end of the first tube section meets the top end of the second tube section, the stop block separates from the lock cylinder assembly and pushes the latch into the conical hole by moving downward relative to each other.

[0012] The pipe section lock using this utility model includes a lock body and a mechanical blocking mechanism. Two lock bodies are fixedly installed on the top of a second pipe section. Each lock body has a locking tongue for connecting the first and second pipe sections. The mechanical blocking mechanism is fixedly installed on the top of a third pipe section. When the bottom of the first pipe section meets the top of the second pipe section, the mechanical blocking mechanism, while separating from the second pipe section, applies a force to the locking tongue by moving downwards relative to it, causing the locking tongue to insert into the bottom of the first pipe section and locking the first and second pipe sections. This utility model provides a pipe section lock that can lock pipe sections together, sufficient to replace all lead screws in the lifting rod except for the bottom lead screw. This drastic reduction in the number of lead screws results in a significant reduction in the weight of the lifting rod. It solves the problems of high weight and high manufacturing cost of existing electric lifting rods. Attached Figure Description

[0013] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings: Figure 1 This is a three-dimensional structural diagram of the unlocking state of a pipe joint lock according to an optional embodiment of the present utility model; Figure 2 This is a three-dimensional structural diagram of a pipe section lock in its locked state, according to an embodiment of the present utility model. Figure 3 This is a schematic diagram of the unlocking state of a pipe joint lock according to an optional embodiment of the present utility model; Figure 4 This is a schematic diagram of the locked state of a pipe section lock according to an optional embodiment of the present utility model; Figure 5 This is a positional relationship diagram of a pipe section lock, which can be selected according to an embodiment of the present utility model.

[0014] The above figures include the following reference numerals: 1. First pipe section; 2. Second pipe section; 3. Third pipe section; 4. Sleeve; 10. Lock body; 20. Mechanical blocking mechanism; 11. Lock cylinder assembly; 12. First clamp; 21. Second clamp; 22. Stop block; 111. Locking tongue assembly; 112. Limiting sub-assembly; 1111, First spring; 1112, Locking tongue; 1121, Second spring; 1122, Slider. Detailed Implementation

[0015] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0016] like Figure 1-5As shown, the pipe section lock according to an embodiment of the present invention includes a lock body 10 and a mechanical blocking mechanism 20; the lock body 10 includes a first clamp 12 and a lock cylinder assembly 11; the first clamp 12 is fixedly sleeved on the top end of the second pipe section 2; the lock cylinder assembly 11 is disposed inside the first clamp 12, and the lock cylinder assembly 11 is used to lock or unlock the first pipe section 1 and the second pipe section 2; the mechanical blocking mechanism 20 is fixedly installed on the top end of the third pipe section 3; wherein, the bottom end of the first pipe section 1 is provided with a sleeve 4, and the sleeve 4 is provided with a tapered hole; the lock cylinder assembly 11 locks or unlocks the first pipe section 1 and the second pipe section 2 by separating or connecting the lock body 10 and the mechanical blocking mechanism 20 to insert or withdraw from the tapered hole of the sleeve 4 of the first pipe section 1.

[0017] Specifically, in this embodiment, each section of the lifting rod is fixed with a nut with a sleeve 4 at its bottom; wherein, the first section 1 is the top section of the lifting rod; the first section 1, the second section 2 and the third section 3 are nested and connected sequentially from top to bottom along the central axis of the lifting rod, and the diameter of the sections increases sequentially from the first section 1 to the third section 3. In this design, the lock body 10 and the mechanical blocking mechanism 20 are located at the same positions on different pipe sections. Precise alignment of the two is essential for unlocking and locking the first pipe section 1 and the second pipe section 2. The lock body 10 and the mechanical blocking mechanism 20 on adjacent pipe sections form a pipe section lock to control the locking and unlocking of adjacent pipe sections. During lifting, the lifting rod can be locked as a single unit at the target height, preventing positional deviation. Furthermore, the screw drive between the lead screw and multiple pipe sections converts the rotational motion of the lead screw into the linear reciprocating motion of the multiple pipe sections, achieving lifting adjustment. Unlike existing technologies that require separate lead screws on each pipe section, this embodiment only requires a single bottom section lead screw. Through the cooperation of this lead screw with each pipe section, the rotational motion of the lead screw is sequentially converted into the linear motion of multiple pipe sections, thus achieving lifting adjustment. This structure reduces the number of lead screws, lowers assembly complexity, and reduces manufacturing costs.

[0018] In one possible implementation, there are two lock cylinder assemblies 11, which are installed symmetrically in the first clamp 12 along the radial direction of the first clamp 12.

[0019] Specifically, the first clamp 12 is provided with two sets of cavities (2 per set) symmetrically in the radial direction. One of the cavities is a cavity extending in the vertical direction, and the other is a strip-shaped groove extending in the horizontal direction. The lower end of the vertical cavity is opened through the wall of the first clamp 12 to receive the mechanical blocking mechanism 20 for docking and separation.

[0020] Preferably, by setting two symmetrical lock cylinder assemblies 11 inside the first clamp 12, the first clamp 12 can achieve balanced force during the locking process, thereby avoiding structural deformation caused by unilateral force and improving the stability of locking; at the same time, the double lock cylinder assembly 11 structure can provide higher locking reliability and effectively prevent loosening when subjected to vibration or external impact; in addition, even if one lock cylinder assembly fails, the other lock cylinder assembly can still maintain the locking function, thereby significantly improving the overall security.

[0021] In one possible implementation, the lock cylinder assembly 11 includes a latch assembly 111 and a limiting assembly 112; the latch assembly 111 is nested inside the first clamp 12 and is used to insert into or exit the tapered hole; the limiting assembly 112 is nested inside the first clamp 12 and is used to cooperate with the latch assembly 111.

[0022] Specifically, the locking tongue component 111 is disposed in the strip groove of the first clamp 12, and the limiting component 112 is disposed in the vertical cavity of the first clamp 12. The two components are in a vertical relationship.

[0023] By setting the limiting sub-component 112 to work in conjunction with the locking tongue sub-component 111, the movement of the locking tongue sub-component 111 can be effectively limited and guided, thereby improving the stability and reliability of locking.

[0024] In one possible implementation, the first clamp 12 has two horizontally symmetrically formed strip-shaped grooves; the latch assembly 111 includes a latch 1112 and a first spring 1111; the latch 1112 is inserted into the corresponding strip-shaped groove, the first end of the latch 1112 is a tapered surface that matches the tapered hole, and the second end of the latch 1112 is provided with a protruding ridge between it and the bottom of the corresponding strip-shaped groove; the first spring 1111 is sleeved on the latch 1112 and located at the... Between the bottom of the groove and the protruding ridge; wherein, when the second end of the locking tongue 1112 is subjected to force, the locking tongue 1112 moves horizontally toward the central axis of the first tube section 1 until the first end of the locking tongue 1112 is inserted into the tapered hole, and the first spring 1111 is compressed; when the pressure on the second end of the locking tongue 1112 is released, the compressed first spring 1111 pushes the protruding ridge to make the locking tongue 1112 move horizontally in the opposite direction until the first end of the locking tongue 1112 leaves the tapered hole.

[0025] Specifically, the locking tongue 1112 is tongue-shaped and made of stainless steel; the first end of the first spring 1111 abuts against the strip groove of the first clamp 12, and the second end is connected to the protrusion of the locking tongue 1112; wherein the horizontal movement of the locking tongue 1112 in the first spring 1111 directly switches the unlocking and locking states of the first pipe section and the second pipe section.

[0026] By using the locking tongue 1112 and the first spring 1111 in combination, the reliability of locking and the ease of use can be greatly improved.

[0027] In one possible implementation, the limiting sub-assembly 112 includes a second spring 1121 and a slider 1122; the top end of the second spring 1121 is connected to the inside of the first clamp 12; the top end of the slider 1122 is connected to the bottom end of the second spring 1121, and the slider 1122 is used to lock the locking tongue 1112 in the position of being inserted into the tapered hole; wherein, when the bottom end of the slider 1122 is subjected to force, the slider 1122 slides upward inside the first clamp 12, and the second spring 1121 is compressed; when the pressure at the bottom end of the slider 1122 is released, the compressed second spring 1121 pushes the slider 1122 downward to contact the locking tongue 1112, thereby locking the locking tongue 1112 in the position of being inserted into the tapered hole.

[0028] Specifically, the limiting sub-assembly 112 is disposed in the vertical cavity of the first clamp 12; the slider 1122 is a cuboid made of stainless steel, and has a groove on the side near the locking tongue 1112 for forming an appropriate contact relationship with the locking tongue 1112 to lock the locking tongue 1112 in the position of being inserted into the tapered hole.

[0029] By using the second spring 1121 and the slider 1122 in combination for limiting, reliable limiting of the locking tongue assembly 111 can be achieved, thereby improving the stability and security of the locking.

[0030] In one possible implementation, the mechanical blocking mechanism 20 includes: a second clamp 21 and a stop block 22; the second clamp 21 is fixedly sleeved on the top end of the third pipe section 3; there are two stops 22, which are symmetrically fixedly arranged on the top end of the second clamp 21 along the radial direction, and are used to cooperate with the lock cylinder assembly 11 to lock or unlock the first pipe section 1 and the second pipe section 2.

[0031] Specifically, the stop block 22 moves up and down relative to the lock cylinder assembly 11 to form a positional relationship of connection or separation with the lock cylinder assembly 11, thereby locking or unlocking the first tube section 1 and the second tube section 2.

[0032] By symmetrically arranging two stops 22 radially within the mechanical blocking mechanism 20, the second clamp 21 can be securely fitted onto the top of the third pipe section 3. These two stops 22 cooperate with the lock cylinder assembly 11 to reliably lock or unlock the first pipe section 1 and the second pipe section 2. This not only improves the stability and security of the locking mechanism but also, through the symmetrical arrangement, ensures more balanced force distribution, preventing loosening or jamming caused by unilateral force, thereby enhancing the overall reliability and durability of the device.

[0033] In one possible implementation, the stop block 22 has a groove, which includes a sloping section and a vertical section connected in sequence. The sloping section is inclined inward from top to bottom, and the vertical section is located at the lower end of the sloping section. When the bottom end of the first tube section 1 is lower than the top end of the second tube section 2, the stop block 22 is used to push the slider 1122 upward and accommodate the second end of the latch 1112 pushed out by the first spring 1111. When the bottom end of the first tube section 1 meets the top end of the second tube section 2, the stop block 22 separates from the lock cylinder assembly 11 and pushes the latch 1112 into the tapered hole by moving downward relative to each other.

[0034] Specifically, the stop block 22 is made of stainless steel; the groove has a broken cross section, forming a transition section with a preset curvature at the inflection point; the contact surface between the stop block 22 and the latch 1112 is an inclined surface.

[0035] By providing a groove formed by a series of inclined and vertical sections on the stop block 22, when the bottom of the first tube section 1 is lower than the top of the second tube section 2, the stop block 22 can lift the slider 1122 and accommodate the locking tongue 1112, thus preventing premature locking. When the bottom of the first tube section 1 meets the top of the second tube section 2, the stop block 22 separates from the lock cylinder assembly 11 and pushes the locking tongue 1112 into the conical hole, achieving reliable locking. This not only ensures accurate timing of locking tongue 1112 insertion, avoiding interference or mis-locking, but also improves the stability and reliability of the locking process.

[0036] In summary, in practical implementation, the lifting rod uses the pipe section lock in this embodiment to connect the pipe sections together. This pipe section lock replaces the remaining lead screws while retaining only the bottom section lead screw. Each pipe section has a nut with a sleeve 4 fixed at its bottom to cooperate with the bottom section lead screw, converting the rotational motion of the lead screw into the linear reciprocating motion of the nut, thereby achieving the lifting and lowering of the lifting rod. The lifting rod under this design operates by lifting section by section. The following only introduces the first pipe section 1, the second pipe section 2, and the third pipe section 3 to illustrate the working principle of the lifting rod.

[0037] When the lifting rod is fully closed, only the nut and screw of the first pipe section 1 are engaged. At this time, the locking tongue 1112 on the first clamp 12 of the second pipe section 2 contacts the stop block 22 on the second clamp 21 of the third pipe section 3, thus unlocking the first pipe section 1 and the second pipe section 2. The pipe section locks at the remaining pipe sections are also unlocked, and all pipe sections retract into the bottom pipe section.

[0038] The principle and process of the lifting boom rising section by section: After the lifting rod is powered on, the reduction motor rotates forward and transmits power to the lead screw through the gear pair, thereby driving the lead screw to rotate forward. When the lead screw rotates, it pushes the nut of the first pipe section 1 and the pipe section to rise. When the first pipe section 1 is about to complete the length of the lead screw, that is, when the bottom sleeve 4 of the first pipe section 1 meets the top of the second pipe section 2, the first pipe section 1 has the action of driving the second pipe section 2 to rise. The second pipe section 2 has the tendency to leave the third pipe section 3. Therefore, the stop block 22 on the second clamp 21 of the third pipe section 3 moves down and applies a force to the locking tongue 1112 in the direction of the first pipe section 1, thereby driving the locking tongue 1112 to move towards the bottom of the first pipe section 1 and insert into the tapered hole of the bottom sleeve 4 of the first pipe section 1. At the same time, the slider 1122 of the first clamp 12 is driven by the elastic force of the second spring 1121 to move downward to contact the locking tongue 1112, and the pipe section lock reaches the locked state. Next, the nut of the second pipe section 2 is screwed into the screw, and the nut of the first pipe section 1 is screwed out of the screw. The nut of the second pipe section 2 moves upward along the screw under the rotation drive of the screw. The overall behavior is that the second pipe section 2 is pushed out and lifted. In this way, the lifting rod is pushed out one section at a time and lifted in sequence until it rises to the specified height.

[0039] The principle and process of the boom descending section by section: Similar to the rising mode of the boom, the boom descends section by section until it reaches the designated height. This example uses the boom fully retracted as an example. After the boom is powered on, the geared motor reverses direction and transmits power to the lead screw via a gear pair, causing the lead screw to rotate in the opposite direction. As the lead screw rotates, it lowers the nut and section of the second pipe section 2. When the second pipe section 2 is about to complete the length of the lead screw, i.e., when the top of the second pipe section 2 meets the inner top of the third pipe section 3, the slider 1122 on the first clamp 12 of the second pipe section 2 is pushed upwards by the stop block 22 on the second clamp 21 of the third pipe section 3, until the stop block 22 completely enters the first clamp 12 of the second pipe section 2. The locking tongue 1112 on the first clamp 12 of the second pipe section 2 moves to the left under the force of the first spring 1111 and contacts the stop block 22, causing the top of the second pipe section 2 to separate from the bottom sleeve 4 of the first pipe section 1. At this point, the pipe section lock is in the unlocked state. Next, the nut of the first tube section 1 is screwed into the screw, and the nut of the second tube section 2 is screwed out of the screw. Driven by the rotation of the screw, the nut of the first tube section 1 moves down along the screw to begin the descent and retraction of the first tube section 1.

[0040] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pipe joint lock, characterized in that, include: The lock body (10) includes a first clamp (12) and a lock cylinder assembly (11); the first clamp (12) is fixedly sleeved on the top end of the second pipe section (2); the lock cylinder assembly (11) is disposed inside the first clamp (12) and is used to lock or unlock the first pipe section (1) and the second pipe section (2). Mechanical blocking mechanism (20), which is fixedly installed at the top of the third pipe section (3); The first tube section (1) is provided with a sleeve (4) at its bottom end, and the sleeve (4) has a tapered hole. The lock cylinder assembly (11) locks or unlocks the first tube section (1) and the second tube section (2) by separating or connecting the lock body (10) and the mechanical blocking mechanism (20) to insert or exit the tapered hole of the sleeve (4) of the first tube section (1).

2. The pipe joint lock according to claim 1, characterized in that, The lock cylinder assembly (11) consists of two parts, which are installed symmetrically in the first clamp (12) along the radial direction.

3. The pipe joint lock according to claim 1, characterized in that, The lock cylinder assembly (11) includes: A locking tongue assembly (111) is nested inside the first clamp (12) and is used to insert into or withdraw from the tapered hole; The limiting sub-component (112) is nested inside the first clamp (12) and is used to cooperate with the locking tongue sub-component (111).

4. The pipe joint lock according to claim 3, characterized in that, The first clamp (12) has two horizontally symmetrical slots; the locking tongue assembly (111) includes: A locking tongue (1112) is inserted into the corresponding strip groove. The first end of the locking tongue (1112) is a tapered surface that matches the tapered hole. A protruding ridge is provided between the second end of the locking tongue (1112) and the bottom of the corresponding strip groove. The first spring (1111) is sleeved on the latch (1112) and located between the bottom of the groove and the convex ridge; When the second end of the latch (1112) is subjected to force, the latch (1112) moves horizontally toward the central axis of the first tube section (1) until the first end of the latch (1112) is inserted into the tapered hole, and the first spring (1111) is compressed; when the pressure on the second end of the latch (1112) is released, the compressed first spring (1111) pushes the convex ridge to make the latch (1112) move horizontally in the opposite direction until the first end of the latch (1112) leaves the tapered hole.

5. The pipe joint lock according to claim 4, characterized in that, The limiting sub-component (112) includes: The second spring (1121) has its top end connected to the inside of the first clamp (12); A slider (1122) is provided, the top end of which is connected to the bottom end of the second spring (1121); the slider (1122) is used to lock the latch (1112) in the position of being inserted into the tapered hole. When the bottom end of the slider (1122) is subjected to force, the slider (1122) slides upward inside the first clamp (12), and the second spring (1121) is compressed; when the pressure at the bottom end of the slider (1122) is released, the compressed second spring (1121) pushes the slider (1122) downward to contact the locking tongue (1112), thereby locking the locking tongue (1112) at the position of being inserted into the tapered hole.

6. The pipe joint lock according to claim 5, characterized in that, The mechanical blocking mechanism (20) includes: The second clamp (21) is fixedly sleeved on the top end of the third pipe section (3); Two stop blocks (22) are fixedly and radially symmetrically at the top of the second clamp (21) to cooperate with the lock cylinder assembly (11) to lock or unlock the first pipe section (1) and the second pipe section (2).

7. The pipe joint lock according to claim 6, characterized in that, The stop block (22) has a groove, which includes a sloping section and a vertical section connected in sequence. The sloping section is inclined inward from top to bottom, and the vertical section is located at the lower end of the sloping section. When the bottom of the first tube section (1) is lower than the top of the second tube section (2), the stop (22) is used to push the slider (1122) upward and accommodate the second end of the latch (1112) pushed out by the first spring (1111); when the bottom of the first tube section (1) meets the top of the second tube section (2), the stop (22) separates from the lock cylinder assembly (11) and pushes the latch (1112) into the tapered hole by moving downward relative to each other.

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