Limiting and retaining structure and pushing device

Abstract

The utility model provides a limiting and retaining structure and a pushing device. The limiting and retaining structure comprises a mounting part and a limiting part, wherein the mounting part is used for mounting and fixing the limiting and retaining structure; the limiting piece is movably connected with the mounting piece, and the limiting piece can be switched between at least two states including a first state and a second state; wherein the limiting piece is used for stopping the target object in the first state and avoiding the target object in the second state, and the limiting piece can also move relative to the mounting piece so as to adjust the extension length of the limiting piece relative to the mounting piece. The retaining hook can solve the technical problem that in the prior art, a retaining hook cannot adapt to changes of types or sizes of target objects, and consequently construction procedures are complex.

Description

TECHNICAL FIELD

[0001] The utility model relates to a tunnel construction technical field, specifically, relate to a kind of limiting stop structure and pusher. BACKGROUND

[0002] Pusher is the equipment commonly used in tunnel construction. Pusher needs to provide counterforce by counterforce structure, and push target object forward. In tunnel construction, such target object is generally the main machine of heading machine or the segment to be laid.

[0003] Target object as push target can bear pressure from soil body, so that target object has the tendency to move in the direction of counterforce structure after being stressed. Therefore, it is necessary to avoid the movement or displacement of target object pushed due to soil pressure.

[0004] The prior art generally uses stop hook to limit and stop target object. However, the deficiency in the prior art is that, because of different construction environments or construction needs, target object pushed often changes, and the stop hook in the prior art cannot adapt to the change of target object type or size, so different stop hooks need to be replaced when the type or size of target object changes, resulting in complex construction process. SUMMARY

[0005] Therefore, the utility model provides a kind of limiting stop structure and pusher to solve the technical problems that the stop hook in the prior art cannot adapt to the change of target object type or size, so different stop hooks need to be replaced when the type or size of target object changes, resulting in complex construction process.

[0006] To solve the above problems, the utility model provides a kind of limiting stop structure, which comprises: a mounting member for mounting and fixing the limiting stop structure; a limiting member movably connected to the mounting member, which can be switched between at least two states including a first state and a second state; wherein the limiting member stops the target object in the first state and avoids the target object in the second state, and the limiting member can move relative to the mounting member to adjust the extension length of the limiting member relative to the mounting member.

[0007] In any of the above technical solutions, the limiting stop structure further comprises: a telescopic drive mechanism for driving the limiting member to move; wherein the telescopic mechanism is an automatic telescopic drive mechanism or a manual telescopic drive mechanism.

[0008] In any of the above technical solutions, the limiting member comprises: a head end that changes pose relative to the mounting member to switch the limiting member between at least two states; and a tail end movably connected to the mounting member and adjusting the extension length of the limiting member relative to the mounting member by moving relative to the mounting member.

[0009] In any of the above technical solutions, the limiting and retreating structure further comprises a screwing part provided at the tail end, wherein the screwing part is used for inserting a screwing tool to drive the tail end to move forward and backward by rotating at least part of the screwing part.

[0010] In any of the above technical solutions, the screwing part comprises a rotatable ring nut provided at the tail end and threadedly connected with the tail end, wherein the ring nut drives the tail end to move forward and backward by rotating.

[0011] In any of the above technical solutions, the screwing part further comprises a sleeve provided outside the ring nut and connected with the mounting part, wherein the sleeve has an opening, and the ring nut can rotate in the sleeve.

[0012] In any of the above technical solutions, the ring nut has one or more screwing tool insertion holes corresponding to the position of the opening.

[0013] In any of the above technical solutions, the mounting part comprises an abutting part, the ring nut abuts against the abutting part to provide the ring nut with a counterforce required for screwing.

[0014] In any of the above technical solutions, the mounting part comprises a first mounting part installed at the fixed end, and a second mounting part connected with the first mounting part and protruding outward relative to the surface of the first mounting part, wherein the mounting part limiting part is supported by the second mounting part.

[0015] The utility model further provides a pushing device, the pushing device comprises: a target object; a pushing end for pushing the target object relative to the fixed end; one or more limiting and retreating structures of any of the above technical solutions, the limiting and retreating structure is installed at the fixed end and is used for stopping the target object.

[0016] Advantages

[0017] The limiting and retreating structure provided by the utility model is used for the pushing device, which comprises: a mounting piece and a limiting piece, the mounting piece is used for mounting and fixing the limiting and retreating structure, and the limiting piece is movably connected with the mounting piece. The limiting piece can be switched among at least two states including a first state and a second state. In the first state, the limiting piece stops the target object, and in the second state, the limiting piece avoids the target object. Thus, the limiting and retreating structure provided by the utility model can stop and limit the target object, so as to limit the movement of the target object. In addition, the limiting piece of the utility model can also move relative to the mounting piece, so as to adjust the extension length of the limiting piece relative to the mounting piece. Thus, the limiting piece of the utility model can be used for stopping different sizes of target objects, and when the type or size of the target object changes, different limiting and retreating structures are no longer needed to be replaced, and only the extension length of the limiting piece needs to be adjusted. Therefore, the utility model can simplify the construction process of the pushing device in the tunnel construction and improve the construction efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The pushing device (side view direction - pin shaft rotation opening and closing type - screw rotation and movement - first state) of the first embodiment of the utility model;

[0019] Figure 2 The pushing device (top view direction - pin shaft rotation opening and closing type - screw rotation and movement - first state) of the first embodiment of the utility model;

[0020] Figure 3 The pushing device (top view direction - pin shaft rotation opening and closing type - screw rotation and movement - second state) of the first embodiment of the utility model;

[0021] Figure 4 The pushing device (side view direction - mounted on the segment - pin shaft rotation opening and closing type - screw rotation and movement - first state) of the second embodiment of the utility model;

[0022] Figure 5 The pushing device (perspective view - pin shaft rotation opening and closing type - screw rotation and movement - first state) of the first embodiment of the utility model;

[0023] Figure 6 The Figure 5 The local enlarged view of the middle C part;

[0024] Figure 7 The moving principle schematic view of the pushing device of the first embodiment of the utility model;

[0025] Figure 8 The Figure 7 The local enlarged view of the middle A part;

[0026] EXPLANATION OF REFERENCE NUMERALS:

[0027] Fixed end: 100; fixed seat: 110; target object: 200; limiting stop structure: 300; mounting piece: 310; first mounting piece: 311; second mounting piece: 312; through hole: 312a; connecting part: 312b; abutting part: 312c; abutting nail: 312c2; limiting piece: 320; head end: 320a; tail end: 320b; second abutting piece: 321; first abutting piece: 322; first pin shaft: 330; second pin shaft: 340; twisting part: 350; sleeve: 351; opening: 351a; ring nut: 352; twisting tool insertion hole: 352a; pipe piece: 600. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0029] The utility model provides a kind of limiting stop structure, which is used in pushing device. Pushing device is the equipment commonly used in tunnel construction. For example, when tunnel construction is carried out by mechanical method, it is often necessary to involve the excavation and laying of bypass channel (such as the communication passage of subway). Taking the communication passage as an example, it needs to be supported in the starting process during construction, and the pre-supporting trolley is opened, which is supported on the inner wall of the tunnel in the upper, lower, left and right directions, and the counterforce structure of the pushing device is supported on the main tunnel pipe piece on the opposite side of the starting direction, to bear the thrust as the back of the pushing device. Further, the pushing device can push the main machine of the excavation equipment and / or the pipe piece to be laid forward to carry out construction.

[0030] For the basic structure and working principle of the pushing device, please refer to the prior art disclosed in Chinese patents CN219910759U, CN219840653U and CN218780355U (also the applicant's prior application), which will not be repeated here.

[0031] It can be understood that, in addition to bypass channel construction, pushing device also has many other application scenarios in tunnel construction. It can be used for horizontal pushing, and also can be used for longitudinal or inclined pushing. In addition to subway construction, pushing device also has wide application prospects in the fields of underground pipeline laying, municipal pipe gallery construction, mining and excavation, etc.

[0032] A jacking device requires a reaction force provided by a reaction structure to push the target object forward. In tunnel construction, the reaction structure is typically a reaction frame, and the target object is usually the main unit of the tunnel boring machine (TBM) or the tunnel segments to be laid. The reaction structure is connected to the fixed end of the jacking device via a structure such as a tie rod. The fixed end is usually the sleeve of the jacking device, but it can also be a tunnel segment or soil. Because the reaction structure is connected to the fixed end, the reaction cylinder on the reaction structure can push the target object when providing the jacking force, thereby achieving tunnel excavation and tunnel segment laying.

[0033] by Figure 1 For example, the reaction structure is located in Figure 1 The right side of the structure (not shown in the figure). The reaction structure is connected to the fixed end 100, which is a sleeve fixed to the tube segment 600. The reaction structure is along... Figure 1 From right to left, the target object 200 is pushed to the left; the target object 200 is the main unit of the pushing device. Figure 1 As indicated by the direction of the middle arrow, the target object 200, which is being pushed, will be subjected to pressure from the soil, causing it to tend to move in the direction of the reaction structure after being subjected to force. Therefore, it is essential to prevent the target object 200 from moving or shifting due to soil pressure.

[0034] The structure that achieves the purpose of stopping and limiting the target object can be called a "backstop hook," which is the limiting and backstop structure of this utility model. This type of limiting and backstop structure can be fixed to a fixed end, and by opening and closing the hook-shaped limiting and backstop structure, it can stop or avoid the target object. However, the shortcomings of the prior art are that, due to different construction environments or construction needs, the target object being pushed often changes. The backstop hooks in the prior art cannot adapt to changes in the type or size of the target object. When the type or size of the target object changes, different backstop hooks need to be replaced, leading to complex construction procedures.

[0035] Therefore, this utility model provides a limiting and anti-reverse structure. For example... Figure 1 As shown, the limiting and preventing structure 300 includes a mounting member 310 and a limiting member 320. The mounting member 310 is used to install and fix the limiting and preventing structure 300. The limiting member 320 is movably connected to the mounting member 310 and can switch between at least two states, including a first state and a second state. In the first state, the limiting member 320 stops the target object 200, and in the second state, it avoids the target object 200. The limiting member 320 can also move relative to the mounting member 310 to adjust its extension length relative to the mounting member 310.

[0036] Regarding the mounting component 310, its function is to install and fix the entire limit and anti-reverse structure 300. For example... Figure 1As shown, the fixed end 100 of the pushing device can be a sleeve fixed on the pipe segment 600, and the limiting and stopping structure 300 is installed on the outer wall of the sleeve. Figure 4 As shown, the fixed end of the pushing device can also be the pipe segment 600 itself, and the limiting and stopping structure 300 is installed on the pipe segment 600. The mounting member 310 can be formed as a mounting plate or a mounting bracket, which can be connected with the fixed end by welding, rivet connection, insertion, etc. It can be understood that the mounting member 310 can be fixedly connected with the fixed end, or movably connected with the fixed end.

[0037] Regarding the limiting member 320, its function is to stop and limit the target object 200. As mentioned above, the target object 200 is generally the main machine of the tunneling machine or the pipe segment to be laid. One end of the limiting member 320 is connected and fixed relative to the fixed end 100 by being connected with the mounting member 310, and the other end is formed as a hook-shaped structure and changes state by opening and closing action. The opening and closing action can be realized by rotation or overturning of the hook-shaped structure.

[0038] As shown in Figure 2 and Figure 3 , the limiting member 320 can be arranged on the left and right opposite sides of the target object 200, which stops and limits the target object 200 in the first state, and is opened by relatively rotating in the horizontal direction to switch to the second state. The limiting member 320 avoids the target object 200 in the second state.

[0039] It can be understood that the setting position and the number of the limiting and stopping structure 300 can be selected and adjusted by those skilled in the art. It is preferred to be arranged in pairs and dispersed on the outer periphery of the sleeve, or arranged in pairs and dispersed on the pipe segment. The limiting and stopping structure 300 can be 2, or 3, 4 or more.

[0040] Exemplarily, as shown in Figure 2 , the two limiting and stopping structures 300 can be arranged in pairs on the sleeve in the horizontal (or vertical) direction.

[0041] Exemplarily, as shown in Figure 4 , the two limiting and stopping structures 300 can be arranged on the pipe segment 600 in the horizontal (or vertical) direction through the fixing seat 110. The fixing seat 110 is a reinforced concrete embedded block (also known as an anchor block).

[0042] Exemplarily, according to the construction needs, three limiting and stopping structures 300 can be uniformly arranged on the sleeve or the pipe segment.

[0043] The limiting piece 320 of the utility model can also move relative to the mounting piece 310. The movement includes the movement of the limiting piece 320 as a whole, and also includes the movement of a part of the limiting piece 320. For example, the limiting piece 320 can include two parts that are sleeved with each other, and the two parts are relative to each other in extension and contraction, so that a part of the structure of the limiting piece 320 can move relative to the mounting piece 310. The limiting piece 320 moves relative to the mounting piece 310, and can extend or contract relative to the mounting piece 310, so as to adjust the extension length of the limiting piece 320 relative to the mounting piece 310. Therefore, in different construction environments or construction requirements, if the size of the target object 200 that is pushed changes, the extension length of the limiting piece 320 relative to the mounting piece 310 can be adjusted to adapt to different target objects 200. Therefore, the limiting piece 320 of the utility model can be used to stop different sizes of target objects 200, and when the type or size of the target object 200 changes, different limiting and retreating structures are no longer needed, and only the extension length of the limiting piece 320 needs to be adjusted. Therefore, the utility model can simplify the construction process of the pushing device in tunnel construction and improve the construction efficiency.

[0044] The limiting piece 320 of the utility model preferably adjusts the extension and contraction distance by moving along a straight line relative to the mounting piece 310. The limiting and retreating structure 300 of the utility model also includes: a telescopic driving mechanism, which is used to drive the limiting piece 320 to move. The telescopic mechanism is an automatic telescopic driving mechanism or a manual telescopic driving mechanism.

[0045] It can be understood that in the prior art, there are various power supply elements and movement modes for driving target components to move. For example, the utility model can use an oil cylinder, an electric cylinder, a motor, an electric push rod and the like as an automatic telescopic driving mechanism to drive the limiting piece 320. The limiting piece 320 and the automatic telescopic driving mechanism can be connected through a transmission structure. For example, a gear and rack, a ball screw, a belt, a cam and the like that can convert rotary motion into linear motion can be used to realize transmission.

[0046] Preferably, an oil cylinder can be used as a telescopic driving mechanism, and the oil cylinder is directly connected with the limiting piece 320. Since the limiting piece 320 is movably connected with the mounting piece 310, the limiting piece 320 can be directly driven to move relative to the mounting piece 310 through the extension and contraction of the oil cylinder.

[0047] For the movable connection between the limiting piece 320 and the mounting piece 310, it can be ensured that the limiting piece 320 can be connected with the mounting piece 310 and can move relative to the mounting piece 310. For example, a sliding rail can be arranged on the mounting piece 310, and a sliding block can be arranged on the limiting piece 320, and the two are in sliding connection, so that the limiting piece 320 can slide relative to the mounting piece 310 along the sliding rail under the drive of the telescopic drive mechanism.

[0048] Preferably, as shown, the limiting piece 320 penetrates the through hole 312a to be movably connected with the mounting piece 310. Under the drive of the telescopic drive mechanism, the limiting piece 320 can move forward and backward relative to the mounting piece 310 along the axis of the through hole 312a. Figure 6

[0049] As for the manual telescopic drive mechanism, it refers to a telescopic drive mechanism that is driven to move the limiting piece 320 by an operator directly or with the help of a tool. For example, the operator can drive the limiting piece 320 to move linearly by turning the manual telescopic drive mechanism with a wrench.

[0050] The advantage of the automatic telescopic drive mechanism is convenient control and accurate stroke. The advantage of the manual telescopic drive mechanism is relatively low cost and simple structure.

[0051] It can be understood that the limiting piece 320 can be directly switched between the first state and the second state, or indirectly switched between the first state and the second state through one or more intermediate states. For example, the limiting piece 320 can be switched from the first state to the third state, and then switched from the third state to the second state; the limiting piece 320 can be switched from the second state to the third state, and then switched from the third state to the first state.

[0052] Among them, the limiting piece 320 can realize the switching among at least two states including the first state and the second state by changing its position or changing its form. Since the position of the mounting piece 310 is fixed, the limiting piece 320 can rotate or flip around the mounting piece 310 to change its position and realize state switching. The limiting piece 320 can also be bent or twisted to change its form and realize state switching.

[0053] ​It should be noted that in the case of the limiting piece 320 being switched between at least two states by changing its own position, the limiting piece 320 needs to be movably connected with the mounting piece 310 through a pin shaft, a hinge, a ball hinge or the like. In this case, it is also feasible to make the limiting piece 320 not only reciprocate back and forth with the mounting piece 310, but also rotate or flip open and close relative to the mounting piece 310. For example, as mentioned above, the limiting piece 320 is connected with the mounting piece 310 through a sliding rail and a sliding block, and a ball hinge structure is arranged at the sliding block, so that the limiting piece 320 can be twisted around the sliding block. However, such a structure is relatively complex.

[0054] Therefore, as shown in Figure 5 and Figure 6 In order to simplify the structure and take into account the stability of state switching, the utility model designs the limiting piece 320 to include: a head end 320a and a tail end 320b. The head end 320a changes the pose relative to the mounting piece 310 to switch the limiting piece 320 between at least two states. The tail end 320b is movably connected with the mounting piece 310 and adjusts the extension length of the limiting piece 320 relative to the mounting piece 310 by moving relative to the mounting piece 310.

[0055] In other words, the limiting piece 320 of the utility model preferably has the head end 320a and the tail end 320b two parts arranged separately and movably connected. The tail end 320b is movably connected with the mounting piece 310 to enable the tail end 320b to move back and forth relative to the mounting piece 310. The head end 320a for limiting and stopping the target object 200 can be switched between the first state and the second state by changing the pose relative to the mounting piece 310. It can be understood that since the head end 320a needs to change the pose, it needs to be movably connected with the tail end 320b. For example, the head end 320a and the tail end 320b are connected through a pin shaft, a hinge or a ball hinge.

[0056] In the above manner, the limiting piece 320 can be moved back and forth as a whole. When moved to a suitable position, the head end 320a arranged separately and movably connected with the tail end 320b can be bent or twisted relative to the tail end 320b to stop or avoid the target object 200. The structure of the above manner is simple, low in cost and can effectively limit and stop the target object 200.

[0057] Specifically, as shown in Figure 5 and Figure 6As shown, the head end 320a and the tail end 320b can be rotatably connected by the first pin shaft 330. The head end 320a and the tail end 320b are respectively provided with position corresponding through holes, the first pin shaft 330 penetrates the head end 320a and the tail end 320b, and the head end 320a can rotate relative to the tail end 320b around the first pin shaft 330 to realize state switching. It can be understood that those skilled in the art can leave a space required for rotation around the head end 320a according to actual needs.

[0058] It can be understood that in order to keep the head end 320a in the first state, the head end 320a and the tail end 320b are respectively further provided with another pair of position corresponding through holes, the second pin shaft 340 penetrates the another pair of through holes of the head end 320a and the tail end 320b and can be inserted and pulled out in the another pair of through holes. The second pin shaft 340 is used to realize locking of the head end 320a. Thus, when the second pin shaft 340 is in the inserted state, the head end 320a and the tail end 320b are relatively fixed. When the second pin shaft 340 is in the pulled out state, the head end 320a can rotate relative to the tail end 320b around the first pin shaft 330.

[0059] It can be understood that the head end 320a and the tail end 320b are preferably in surface contact at the position of mutual connection to ensure that they remain stable during relative movement. Preferably, the tail end 320b has a second abutting piece 321, and the head end 320a has a first abutting piece 322. The head end 320a and the tail end 320b are in contact with each other through the first abutting piece 322 and the second abutting piece 321. The two pairs of through holes mentioned above are arranged above the first abutting piece 322 and the second abutting piece 321, so as to ensure that the head end 320a and the tail end 320b remain stable during relative movement, and to facilitate installation of the first pin shaft 330 and insertion and pulling out of the second pin shaft 340.

[0060] As mentioned above, for the limiting piece 320 and the mounting piece 310, there are various movable connection modes that can be adopted between the two. Preferably, the limiting piece 320 is arranged to be supported by the mounting piece 310, the mounting piece 310 is provided with a through hole 312a, the tail end 320b penetrates the through hole 312a and can move forward and backward along the axis of the through hole 312a.

[0061] The advantage of the above mode is that the tail end 320b penetrating the through hole 312a can be supported and limited by the mounting piece 310, and during the process of expansion and contraction of the tail end 320b relative to the mounting piece 310, the advancing direction of the tail end 320b is limited by the through hole 312a, and it is not easy to be deformed or deviate from the advancing track due to self weight. Therefore, the movable connection mode of the tail end 320b and the mounting piece 310 through the through hole 312a can ensure relatively stable expansion and contraction of the limiting piece 320 with a relatively simple structure.

[0062] It can be understood that there are many ways to set the limiting member 320 to be supported by the mounting member 310. For example, a matching structure that can be in contact with each other is arranged on the limiting member 320 and the mounting member 310, respectively, or part of the structure of the mounting member 310 is arranged to be symmetrical on both sides, and part of the structure of the limiting member 320 is inserted between the corresponding symmetrical structures of the mounting member 310, so that the mounting member 310 can clamp the limiting member 320.

[0063] As an example, Figure 5 and Figure 6 The mounting member 310 includes a first mounting member 311 and a second mounting member 312. The first mounting member 311 is mounted on the fixed end 100. The second mounting member 312 is connected with the first mounting member 311 and protrudes outward relative to the surface of the first mounting member 311. Among them, the through hole 312a is arranged on the second mounting member 312, and the limiting member 320 is supported by the second mounting member 312.

[0064] Specifically, the first mounting member 311 is formed as a flat plate structure or an arc surface structure that fits the fixed end 100. For example, when the fixed end 100 is a sleeve, the first mounting member 311 can be formed as an arc-shaped plate to fit the outer wall of the sleeve. For example, when the segment 600 is used as the fixed end, a construction plane can be arranged or built on the concave surface of the segment 600. The concave surface of the segment 600 is filled and reinforced as a construction plane, and the first mounting member 311 can be connected to the construction plane in a flat plate structure. The second mounting member 312 serves to support the limiting member 320, so it needs to protrude outward relative to the surface of the first mounting member 311.

[0065] As an example, Figure 5 and Figure 6 The second mounting member 312 includes a connecting portion 312b and an abutting portion 312c. Among them, the through hole 312a is arranged on the connecting portion 312b, and the connecting portion 312b is formed as a structure protruding relative to the first mounting member 311, which can be a square plate or a polygonal plate or a circular plate or any shape. The abutting portion 312c is connected with any one of the connecting portion 312b and the first mounting member 311, or is respectively connected with the connecting portion 312b and the first mounting member 311. The limiting member 320 is in contact with the abutting portion 312c, so that the abutting portion 312c supports and limits the limiting member 320.

[0066] Preferably, the two abutting portions 312c are symmetrically arranged on opposite sides of the limiting member 320 and are in contact with the limiting member 320, respectively.

[0067] Preferably, a through hole is provided on the abutting portion 312c, and the abutting nail 312c2 penetrates the abutting portion 312c through the through hole. The through hole on the abutting portion 312c has an internal thread, and the outer wall of the abutting nail 312c2 has an external thread. The abutting nail 312c2 can be moved relative to the abutting portion 312c by rotating to adjust the tightness of the clamping of the limiting piece 320, thereby ensuring that the limiting piece 320 moves smoothly and stably. The number of abutting nails 312c2 can be one or more, preferably, as shown in Figure 5 and Figure 6 The abutting nail 312c2 is in contact with the first abutting piece 322.

[0068] As described above, the manual telescopic driving mechanism has the advantages of low cost and small structure. Therefore, the manual telescopic driving mechanism capable of being twisted is designed by the following technical solutions.

[0069] As shown in Figure 5 and Figure 6 The limiting and retreating structure 300 further comprises a twisting portion 350 provided on the tail end 320b. The twisting portion 350 is used for inserting a twisting tool, so that the twisting tool drives the tail end 320b to move forward and backward along the axis of the through hole 312a by rotating at least part of the twisting portion 350. The mode of driving the limiting piece 320 to move in a twisting manner can facilitate relatively accurate control of the movement stroke of the limiting piece 320.

[0070] Specifically, as shown in Figure 7 and Figure 8 The twisting portion 350 comprises a rotatable ring nut 352 provided on the tail end 320b and threadedly connected with the tail end 320b. The ring nut 352 drives the tail end 320b to move forward and backward along the axis of the through hole 312a by rotating.

[0071] The ring nut 352 is sleeved on the outer periphery of the tail end 320b and has an internal thread. The position corresponding to the ring nut 352 of the tail end 320b has an external thread. Thus, the ring nut 352 can drive the tail end 320b to move by rotating.

[0072] Preferably, as shown in Figure 7 and Figure 8 The twisting portion 350 further comprises a sleeve 351 sleeved outside the ring nut 352 and connected with the mounting piece 310, and the sleeve 351 has an opening 351a. The ring nut 352 can rotate in the sleeve 351.

[0073] Specifically, the mounting member 310 includes an abutting portion 312b, and the ring nut 352 is in abutting contact with the abutting portion 312b, so that the abutting portion 312b provides a counterforce required for the ring nut 352 to be screwed. The position of the opening 351a is used for the insertion of a screwing tool, so that an operator rotates the ring nut 352 using the screwing tool. Exemplarily, the screwing tool can be a wrench.

[0074] Preferably, as shown in Figure 7 and Figure 8 The ring nut 352 has one or more screwing tool insertion holes 352a corresponding to the position of the opening 351a. Thus, a more compact screwing tool such as a hexagonal socket wrench can be used to rotate the ring nut 352.

[0075] The utility model also provides a pushing device, the pushing device includes: target 200 and pushing end, pushing end is used for pushing target 200 relative to fixed end 100. Target 200 can be the host computer and / or segment of the pushing device, and the pushing end can be a counterforce frame provided with a pushing oil cylinder. The pushing end is connected with the fixed end 100. The pushing device further includes one or more limiting stop structures 300 according to any of the above technical solutions, and the limiting stop structure 300 is installed on the fixed end 100 and is used for stopping the target 200.

[0076] The pushing device of the utility model includes the limiting stop structure 300 according to any of the technical solutions of the utility model, and thus has all the beneficial effects of the limiting stop structure 300 according to any of the technical solutions of the utility model, which will not be repeated here.

[0077] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the utility model.

Claims

1. A limiting and retreating structure, characterized in that, The limiting and retreating structure (300) comprises: a mounting member (310) for mounting and fixing the limiting and retreating structure (300); a limiting member (320) movably connected with the mounting member (310), which can be switched between at least two states including a first state and a second state; wherein the limiting member (320) stops the target object (200) in the first state and avoids the target object (200) in the second state, and the limiting member (320) can also move relative to the mounting member (310) to adjust the extension length of the limiting member (320) relative to the mounting member (310).

2. The position limiting and retreat preventing structure according to claim 1, characterized in that, The limiting and retreating structure (300) further comprises: a telescopic driving mechanism for driving the limiting member (320) to move; wherein the telescopic mechanism is an automatic telescopic driving mechanism or a manual telescopic driving mechanism.

3. The position limiting and retreat preventing structure according to claim 1, characterized in that, The limiting member (320) comprises: a head end (320a) that changes the pose relative to the mounting member (310) to switch the limiting member (320) between the at least two states; a tail end (320b) movably connected with the mounting member (310) and adjusting the extension length of the limiting member (320) relative to the mounting member (310) by moving relative to the mounting member (310).

4. The position limiting and retreat preventing structure according to claim 3, characterized in that, The limiting and retreating structure (300) further comprises: a twisting part (350) provided at the tail end (320b); wherein the twisting part (350) is used for inserting a twisting tool to drive the tail end (320b) to move forward and backward by rotating at least part of the twisting part (350).

5. The position limiting and retreat preventing structure according to claim 4, characterized in that, The twisting part (350) comprises: a rotatable ring nut (352) provided at the tail end (320b) and threadedly connected with the tail end (320b); wherein the ring nut (352) drives the tail end (320b) to move forward and backward by rotating.

6. The position limiting and retreat preventing structure according to claim 5, characterized in that, The twisting part (350) further comprises: a sleeve (351) sleeved outside the ring nut (352) and connected with the mounting member (310), the sleeve (351) having an opening (351a); wherein the ring nut (352) can rotate inside the sleeve (351).

7. The position limiting and retreat preventing structure according to claim 6, characterized in that, The mounting member (310) comprises an abutting part (312b), the ring nut (352) abuttingly contacts with the abutting part (312b) to provide the ring nut (352) with the required counterforce for twisting.

8. The position limiting and retreat preventing structure according to claim 6, characterized in that, The ring nut (352) has one or more twisting tool insertion holes (352a) corresponding to the position of the opening (351a).

9. The limiting and retaining structure according to any one of claims 3 to 8, characterized in that, The mounting member (310) comprises: A first mounting member (311) is mounted on the fixed end (100); A second mounting member (312) is connected with the first mounting member (311) and protrudes outward relative to the surface of the first mounting member (311); Wherein, the limiting member (320) is supported by the second mounting member (312).

10. A pushing device, characterized in that The pushing device comprises: A target object (200); A pushing end for pushing the target object (200) relative to the fixed end (100); One or more limiting and retreating structures (300) as claimed in any one of claims 1 to 9 are mounted on the fixed end (100) and used to stop the target object (200).

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