Limiting structure and pushing device

Abstract

The utility model provides a limiting structure and a pushing device. The limiting structure comprises a mounting part and a limiting part, wherein the mounting part is used for fixedly mounting the limiting structure; the limiting piece comprises a head end and a tail end, the tail end is connected with the mounting part, and the head end moves relative to the tail end, so that the limiting piece is 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. The limiting structure is applied to the pushing device, and the problem that a pushed target object moves or shifts due to the fact that the target object is subjected to soil pressure in the construction environment of the pushing device in the prior art can be solved.

Description

TECHNICAL FIELD

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

[0002] The pusher is a commonly used equipment in tunnel construction. For example, when tunnel construction is carried out by mechanical method, the excavation and laying of bypass channel (such as the connecting channel of subway) are often involved. Taking the connecting channel as an example, in the construction, the pre-supporting trolley needs to be opened in the starting process, and it is supported on the inner wall of the tunnel in the upper, lower, left and right directions, and the counterforce structure of the pusher is supported on the main tunnel segment on the opposite side of the starting direction to bear the thrust as the back of the pusher. Further, the pusher can push the main machine of the excavating equipment and / or the segment to be laid forward to carry out construction.

[0003] It can be understood that in addition to bypass channel construction, the pusher also has many other application scenarios in tunnel construction. It can be used for lateral pushing, and also can be used for longitudinal or inclined pushing. In addition to subway construction, the pusher has wide application prospects in the fields of underground pipeline laying, municipal pipe gallery construction, mining and excavation, etc.

[0004] As mentioned above, the pusher needs to provide counterforce through the counterforce structure to push the target object forward. In tunnel construction, such target objects are generally the main machine of the excavating machine or the segment to be laid. The target object as the pushing target will bear the pressure from the soil body, so that the target object tends to move in the direction of the counterforce structure after being stressed. Therefore, it is necessary to provide a limiting structure to avoid the movement or displacement of the target object being pushed due to the pressure of the soil body. SUMMARY

[0005] Therefore, the utility model provides a limiting structure and pusher to solve the technical problem that the target object moves in the direction of the counterforce structure after being stressed by the soil body.

[0006] To solve the above problems, the utility model provides a limiting structure, which comprises: a mounting part for fixedly mounting the limiting structure; a limiting piece comprising a head end and a tail end, the tail end being connected with the mounting part, and the head end being movable relative to the tail end so that the limiting piece switches between at least two states including a first state and a second state; wherein the limiting piece stops the target object in the first state and avoids the target object in the second state.

[0007] In any of the above technical solutions, the head end and the tail end are connected in a detachable manner.

[0008] In any of the above technical solutions, the limiting structure further comprises a locking member for locking the head end relative to the tail end so that the limiting member remains in the first state.

[0009] In any of the above technical solutions, the head end and the tail end are connected through a ball hinge structure; or the head end and the tail end are connected through a pin shaft structure.

[0010] In any of the above technical solutions, the limiting structure further comprises a first pin shaft penetrating the head end and the tail end to rotatably connect the two; and a second pin shaft movably inserted into the head end and the tail end to lock the two so that the limiting structure remains in the first state.

[0011] In any of the above technical solutions, the head end comprises two first abutting members, the tail end comprises a second abutting member arranged between the two first abutting members, and the first pin shaft and the second pin shaft each penetrate the first abutting member and the second abutting member, respectively, and the first abutting member and the second abutting member abut and contact each other.

[0012] In any of the above technical solutions, the first abutting member is formed as a flat plate structure, and the second abutting member has a flat surface, and the first abutting member and the flat surface are in surface contact.

[0013] In any of the above technical solutions, the head end has a convex surface, the tail end has a concave surface, and the head end and the tail end are concave-convex matched at the connection to enable the head end to rotate relative to the tail end.

[0014] In any of the above technical solutions, the limiting structure further comprises a bolt connecting the head end and the tail end at the connection; and the head end is rotatable relative to the tail end about the bolt.

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

[0016] Advantages

[0017] The limiting structure of this utility model includes a mounting part and a limiting member. The mounting part is used to fix the limiting structure in place, and the limiting member includes a head end and a tail end. The limiting structure of this utility model is used to limit and stop the target object being pushed by the jacking device. The limiting member can switch between at least two states, including a first state and a second state. In the first state, the limiting member stops the target object, and in the second state, it avoids the target object. To achieve the above state switching, the tail end of the limiting member is connected to the mounting part, and the head end of the limiting member is movable relative to the tail end. Therefore, the tail end can be fixed, and by changing or switching the position or posture of the head end relative to the tail end, the state switching of the limiting member can be achieved, thereby limiting and stopping the pushed target object and preventing it from moving or shifting due to soil pressure. Attached Figure Description

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

[0019] Figure 2 The pushing device of the second embodiment of this utility model (side view - ball joint flip opening and closing type - first state);

[0020] Figure 3 The pushing device of the second embodiment of this utility model (top view - ball joint flip opening and closing type - first state);

[0021] Figure 4 The pushing device of the second embodiment of this utility model (top view - ball joint flip opening and closing type - second state);

[0022] Figure 5 for Figure 2 Enlarged view of part B in the middle;

[0023] Figure 6 The pushing device of the third embodiment of this utility model (side view - installed on the tube segment - pin shaft rotation opening and closing type - first state);

[0024] Figure 7 for Figure 1 Enlarged view of a section in the middle C;

[0025] Figure 8 This is a schematic diagram illustrating the moving principle of the jacking device according to the first embodiment of the present invention;

[0026] Figure 9 for Figure 8 A magnified view of part A in the middle.

[0027] Explanation of reference numerals in the attached figures:

[0028] Fixed end: 100; mounting seat: 110; target object: 200; limiting structure: 300; mounting portion: 310; through hole: 312a; 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; screwing portion: 350; sleeve: 351; opening: 351a; ring sleeve: 352; bolt: 370; pipe piece: 600. DETAILED DESCRIPTION

[0029] 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 protection scope of the utility model.

[0030] The utility model provides a kind of limiting structure, which is used in pusher device. Pusher 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 opened in the starting process during construction, and it is supported on the inner wall of the tunnel in the upper, lower, left and right directions, and the counterforce structure of the pusher 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 pusher device. Further, the pusher device can push the main machine of the excavation equipment and / or the pipe piece to be laid forward to carry out construction.

[0031] For the basic structure and working principle of the pusher 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.

[0032] It can be understood that, in addition to bypass channel construction, the pusher device also has many other application scenarios in tunnel construction. It can be used for horizontal pushing, and can also be used for vertical or inclined pushing. In addition to subway construction, the pusher device also has wide application prospects in the fields of underground pipeline laying, municipal pipe gallery construction, mining and excavation, etc.

[0033] 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.

[0034] by Figure 2 and Figure 3 For example, the reaction structure is located in Figure 2 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 2 and Figure 3 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 2 and Figure 3 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.

[0035] like Figure 1 and Figure 2 As shown, the limiting structure 300 of this utility model includes a mounting part 310 and a limiting member 320. The mounting part 310 is used to fix the limiting structure 300 in place. The limiting member 320 includes a head end 320a and a tail end 320b. The tail end 320b is connected to the mounting part 310, and the head end 320a can move relative to the tail end 320b.

[0036] The limiting structure 300 of this invention is used to limit and stop the target object 200 pushed by the pushing device. The limiting member 320 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.

[0037] To achieve the aforementioned state switching, this invention connects the tail end 320b of the limiting member 320 to the mounting part 310, and the head end 320a is configured to be movable relative to the tail end 320b. Thus, the tail end 320b can be fixed, and by changing or switching the position or posture of the head end 320a relative to the tail end 320b, the state switching of the limiting member 320 can be achieved, thereby limiting and stopping the pushed target object 200 and preventing it from moving or shifting due to soil pressure.

[0038] As to the installation part 310, it functions to install and fix the whole limiting structure 300. As shown in Figure 2 and Figure 3 , the fixed end 100 of the pushing device can be a sleeve fixed on the pipe segment 600, and the limiting structure 300 is installed on the outer wall of the sleeve. As shown in Figure 6 , the fixed end of the pushing device can also be the pipe segment 600 itself, and the limiting structure 300 is installed on the pipe segment 600. The installation part 310 can be formed as an installation plate or an installation support, which can be connected with the fixed end through welding, rivet connection, plug-in connection and the like. It can be understood that the installation part 310 can be fixedly connected with the fixed end, or can be movably connected with the fixed end.

[0039] As to the limiting piece 320, it functions 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. The tail end 320b of the limiting piece 320 is connected and fixed relative to the fixed end 100 through the connection with the installation part 310, and the head end 320a is formed as a hook-shaped structure and changes the state through opening and closing action. The opening and closing action can be realized through rotation or overturning of the hook-shaped structure. It can be understood that those skilled in the art can leave out the space required for rotation or overturning around the head end 320a according to actual needs.

[0040] As shown in Figure 1 , the limiting piece 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 along the horizontal direction to switch to the second state. The limiting piece 320 avoids the target object 200 in the second state.

[0041] It can be understood that the arrangement position and the arrangement number of the limiting 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 structure 300 can be 2, or 3, 4 or more.

[0042] Exemplarily, as shown in Figure 3 and Figure 4 , the limiting structure 300 with a number of 2 can be arranged in pairs on the sleeve along the horizontal (or vertical) direction.

[0043] Exemplarily, as shown in Figure 6 , the limiting structure 300 with a number of 2 can be arranged on the pipe segment 600 along the horizontal (or vertical) direction through the fixing seat 110. Among them, the fixing seat 110 is a reinforced concrete embedded block (also known as an anchor block).

[0044] Exemplarily, the number of the limiting structures 300 can be 3, which are evenly arranged on the sleeve or segment according to the construction needs.

[0045] It can be understood that the limiting member 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 member 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 member 320 can be switched from the second state to the third state, and then switched from the third state to the first state.

[0046] In addition to being able to avoid the target object 200 being pushed from moving or shifting due to the earth pressure, another advantage of the utility model is that it is convenient to maintain and maintain, and the cost is lower and the efficiency is higher when maintaining and maintaining.

[0047] Specifically, the limiting structure can switch between the open and closed states by changing its position or shape. Assuming that the mounting portion and the limiting member of the limiting structure are connected movably (such as: pin shaft connection, or spherical hinge connection), the limiting member as a whole can also lock the target object if it changes its position or posture relative to the fixedly mounted mounting portion. Since the movable connection position is prone to wear and damage, the limiting structure will have maintenance and replacement needs. If the limiting locking is realized in the above manner, the mounting portion and the limiting member need to be replaced at the same time when the movable connection position between the mounting portion and the limiting member is damaged, which increases the cost of maintenance and maintenance. In addition, since the mounting portion is fixedly mounted, the implementation of fixed mounting is usually by welding, riveting and other methods, and the replacement of the mounting portion will be relatively complex and troublesome. Therefore, compared with the technical solution of movably connecting the mounting portion and the limiting member of the limiting structure, the utility model connects the limiting structure 300 through its tail end 320b and the mounting portion 310, and sets its head end 320a to be movably connected with the tail end 320b, so that the limiting structure 300 realizes state switching through its own shape change. When the movable connection position is worn and damaged, only the limiting member 320 or part of the limiting member 320 needs to be replaced to complete the maintenance, which has lower maintenance and maintenance cost and simpler process requirement, and higher efficiency.

[0048] Preferably, the head end 320a and the tail end 320b can be connected to each other in a detachable manner. The ways to realize detachable connection include bolt and nut connection, pin shaft connection, buckle connection and the like. The advantage of detachably connecting the head end 320a and the tail end 320b is that it can further facilitate the maintenance and replacement of the corresponding parts of the head end 320a and / or the tail end 320b.

[0049] It can be understood that for the limiting structure 300, under the action of the weight of the target object 200 or the force on the limiting structure 300 when it is in the first state, the limiting structure 300 can be relatively fixed. However, preferably, the limiting structure 300 can be further provided with a locking structure to ensure that the limiting structure 300 can be fixed in the first state, thereby improving the stability of the limiting and locking of the target object 200.

[0050] Specifically, the limiting structure 300 further comprises a locking member for locking the head end 320a relative to the tail end 320b so that the limiting member 320 remains in the first state.

[0051] Exemplarily, the locking member can be arranged at the connection between the head end 320a and the tail end 320b, and the locking member can achieve the purpose of relative fixation of the head end 320a and the tail end 320b by means of friction braking, elastic locking, clamping locking, etc. Of course, in addition to mechanical locking, hydraulic locking, pneumatic locking, electromagnetic locking, etc. can also be used to achieve the relative fixation of the head end 320a and the tail end 320b.

[0052] Under the premise of ensuring the stability of the locking, taking into account the needs of simplifying the structure and reducing the cost, the utility model preferably adopts the pin shaft structure to connect the head end 320a and the tail end 320b to achieve the relative fixation of the two.

[0053] As shown in Figure 2 In addition to the pin shaft connection, the utility model can also connect the head end 320a and the tail end 320b through a ball hinge structure. It can be understood that the pin shaft connection allows the head end 320a to rotate relative to the tail end 320b around a specific plane. Therefore, the two limiting structures 300 arranged oppositely can be opened and closed to achieve locking and opening. The difference between the ball hinge connection and the pin shaft connection is that the rotation direction of the ball hinge connection is not limited. For example, as shown in Figure 3 and Figure 4 The two limiting structures 300 arranged oppositely can each be flipped to achieve locking and opening. Among them, each limiting structure 300 can be flipped in the same direction or in different directions. The ball hinge connection makes the movement of the limiting structure 300 not easily restricted by space, and is more flexible.

[0054] Exemplarily, as shown in Figure 1 and Figure 7 The limiting structure 300 of the utility model further comprises a first pin shaft 330 and a second pin shaft 340. The first pin shaft 330 penetrates the head end 320a and the tail end 320b to rotationally connect the two. The second pin shaft 340 can be movably inserted and pulled out relative to the head end 320a and the tail end 320b to lock the two, so that the limiting structure 300 remains in the first state.

[0055] Specifically, 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 in order to keep the head end 320a in the first state, the head end 320a and the tail end 320b are also respectively provided with another pair of position corresponding through holes, the second pin shaft 340 penetrates the other pair of through holes of the head end 320a and the tail end 320b and can be inserted and pulled out in the other pair of through holes. 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.

[0056] Preferably, the head end 320a includes two first abutting pieces 322, the tail end 320b includes a second abutting piece 321 arranged between the two first abutting pieces 322, the first pin shaft 330 and the second pin shaft 340 each respectively penetrate the first abutting piece 322 and the second abutting piece 321, and the first abutting piece 322 and the second abutting piece 321 abut and contact each other. Accordingly, it can be understood that the two pairs of through holes mentioned above are arranged on the first abutting piece 322 and the second abutting piece 321. The above structure ensures that the head end 320a and the tail end 320b remain stable during relative movement, and makes the first pin shaft 330 easy to install and the second pin shaft 340 easy to insert and pull out.

[0057] Preferably, the first abutting piece 322 is formed as a flat plate structure, the second abutting piece 321 has a plane, and the first abutting piece 322 and the plane are in surface contact. It can be understood that the head end 320a and the tail end 320b are in surface contact at the position of mutual connection, which can ensure that they remain stable during relative movement.

[0058] In addition to the pin shaft connection, the utility model also can adopt the following spherical hinge connection mode to movably connect the head end 320a and the tail end 320b.

[0059] As shown in Figure 2 and Figure 5 The utility model can set the head end 320a as having a convex surface, set the tail end 320b as having a concave surface, and make the head end 320a and the tail end 320b fit concave-convex at the connection position, so that the head end 320a can rotate relative to the tail end 320b. The above spherical hinge connection makes the movement of the limiting structure 300 not easy to be limited by space, and if it is blocked or encounters an obstacle in the construction environment, it can be locked and opened by adjusting the overturning direction and changing the movement path, so that the spherical hinge connection mode makes the application scene of the limiting structure 300 less limited, and the locking or avoiding path is more flexible.

[0060] It can be understood that one side of the head end 320a is formed as a spherical head, and one side of the tail end 320b is formed as a spherical surface, and the two can form a self-locking spherical hinge structure through interference fit or elastic deformation. In order to ensure the connection strength of the two, preferably, the limiting structure 300 further comprises: a bolt 370 connecting the head end 320a and the tail end 320b to each other at the connection therebetween; wherein the head end 320a can rotate relative to the tail end 320b around the bolt 370.

[0061] For the limiting piece 320 and the mounting part 310, the two can be fixedly connected or movably connected. Preferably, the tail end 320b and the mounting part 310 are movably connected, and the tail end 320b can move relative to the mounting part 310, so as to adjust the extension length of the head end 320a relative to the mounting part 310 through the movement. Thus, in different construction environments or construction requirements, if the size of the target object 200 to be pushed changes, the extension length of the head end 320a of the limiting piece 320 relative to the mounting part 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 structures are no longer needed, and only the extension length of the limiting piece 320 needs to be adjusted. Therefore, the above-mentioned mode can simplify the construction process of the pushing device in tunnel construction and improve construction efficiency.

[0062] The limiting piece 320 of the utility model preferably adjusts the extension distance by moving along a straight line relative to the mounting part 310. Illustratively, the limiting structure 300 of the utility model further comprises: an extension driving mechanism for driving the limiting piece 320 to move. The extension mechanism is an automatic extension driving mechanism or a manual extension driving mechanism.

[0063] 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 automatic extension driving mechanism such as an oil cylinder, an electric cylinder, a motor, an electric push rod, etc. to drive the limiting piece 320. The tail end 320b of the limiting piece 320 and the automatic extension driving mechanism can be connected through a transmission structure. For example, a gear and rack, a ball screw, a belt, a cam, etc. that can convert rotary motion into linear motion can be used to realize transmission.

[0064] In one example of the utility model, an oil cylinder can be used as an extension driving mechanism, and the oil cylinder is directly connected with the tail end 320b of the limiting piece 320. The extension of the oil cylinder can directly drive the limiting piece 320 as a whole to move relative to the mounting part 310.

[0065] For the movable connection between the tail end 320b and the mounting portion 310, it can be ensured that the tail end 320b can be connected with the mounting portion 310, and the limiting piece 320 as a whole can be driven by the tail end 320b to move relative to the mounting portion 310. For example, a sliding rail can be arranged above the mounting portion 310, and a sliding block can be arranged on the tail end 320b, and the two are in sliding connection, so that the limiting piece 320 can slide relative to the mounting portion 310 as a whole along the sliding rail under the drive of the telescopic drive mechanism.

[0066] Preferably, as shown in Figures 7 to 9 The limiting piece 320 penetrates the through hole 312a to be movably connected with the mounting portion 310. Under the drive of the telescopic drive mechanism, the tail end 320b can move forward and backward along the axis of the through hole 312a to drive the head end 320a to move forward and backward relative to the mounting portion 310.

[0067] 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 portion 310. During the telescopic movement of the tail end 320b relative to the mounting portion 310, the advancing direction of the tail end 320b is limited by the through hole 312a, and it is not easy to deform or deviate from the advancing track due to the self-weight. Therefore, the mode of movably connecting the tail end 320b with the mounting portion 310 through the through hole 312a can ensure the relatively stable telescopic movement of the limiting piece 320 with a relatively simple structure.

[0068] It can be understood that there are various ways to arrange the limiting piece 320 to abut against the mounting portion 310. For example, a matching structure that can abut against and contact each other can be arranged on the limiting piece 320 and the mounting portion 310, respectively, or part of the structure of the mounting portion 310 can be arranged to be symmetrical on both sides, and part of the structure of the limiting piece 320 can be inserted between the corresponding symmetrical structures of the mounting portion 310, so that the mounting portion 310 can clamp the limiting piece 320.

[0069] Exemplarily, as shown in Figure 7 The mounting portion 310 includes a first mounting portion 311 and a second mounting portion 312. The first mounting portion 311 is mounted to the fixed end 100. The second mounting portion 312 is connected with the first mounting portion 311 and protrudes outward relative to the surface of the first mounting portion 311. The through hole 312a is arranged on the second mounting portion 312, and the limiting piece 320 is supported by the second mounting portion 312.

[0070] Specifically, the first mounting portion 311 is formed in a flat plate structure or an arc surface structure that is attached to the fixed end 100. For example, when the fixed end 100 is a sleeve, the first mounting portion 311 can be formed in an arc-shaped plate to be attached to the outer wall of the sleeve. For another 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 first mounting portion 311 can be formed in a flat plate structure that is attached to the construction plane formed by filling and reinforcing the concave surface of the segment 600. The second mounting portion 312 is used to support the limiting member 320, and thus it needs to protrude outward relative to the surface of the first mounting portion 311.

[0071] As shown in Figure 7 , the second mounting portion 312 includes a connecting portion 312b and an abutting portion 312c. The through hole 312a is arranged on the connecting portion 312b. The connecting portion 312b is formed in a protruding structure relative to the first mounting portion 311, and can be formed in a square plate, a polygonal plate, a circular plate or any other shape. The abutting portion 312c is connected to either one of the connecting portion 312b and the first mounting portion 311, or is respectively connected to both the connecting portion 312b and the first mounting portion 311. The limiting member 320 is in abutting contact with the abutting portion 312c, so that the abutting portion 312c supports and limits the limiting member 320.

[0072] Preferably, the two abutting portions 312c are symmetrically arranged on opposite sides of the limiting member 320 and are respectively in abutting contact with the limiting member 320.

[0073] Preferably, the abutting portion 312c is provided with a through hole, 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, so as to adjust the tightness of the clamping of the limiting member 320, thereby ensuring smooth and stable movement of the limiting member 320. The number of abutting nails 312c2 can be one or more. Preferably, as shown in Figure 7 , the abutting nail 312c2 is in contact with the first abutting member 322.

[0074] As shown in Figures 7 to 9 , the limiting structure 300 further includes a screwing portion 350 arranged on the tail end 320b. The screwing portion 350 is used for inserting a screwing tool, so that the screwing tool drives the tail end 320b to move back and forth along the axis of the through hole 312a by rotating at least part of the screwing portion 350. The screwing manner of driving the limiting member 320 to move can facilitate relatively accurate regulation of the movement stroke of the limiting member 320.

[0075] Specifically, as shown in Figure 8 and Figure 9As shown in the figure, the screwing part 350 comprises a rotatable ring nut 352, which is arranged at the tail end 320b and is threadedly connected with the tail end 320b. The ring nut 352 drives the tail end 320b to move back and forth along the axis of the through hole 312a by rotating.

[0076] The ring nut 352 is sleeved on the outer periphery of the tail end 320b and has an internal thread. The tail end 320b has an external thread at a position corresponding to the ring nut 352. Thus, the ring nut 352 can drive the tail end 320b to move by rotating.

[0077] Preferably, as shown in the figures, Figure 8 and Figure 9 the screwing part 350 further comprises a sleeve 351, which is sleeved outside the ring nut 352 and is connected with the mounting part 310. The sleeve 351 has an opening 351a. The ring nut 352 can rotate within the sleeve 351.

[0078] Specifically, the mounting part 310 comprises an abutting part 312b, which abuts against the ring nut 352 to provide a counterforce required by the ring nut 352 for screwing. The opening 351a is arranged for a screwing tool to be inserted, so that an operator can rotate the ring nut 352 using the screwing tool. Exemplarily, the screwing tool can be a wrench.

[0079] Preferably, as shown in the figures, Figure 8 and Figure 9 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 an internal hexagonal wrench can be used to rotate the ring nut 352.

[0080] The utility model also provides a pushing device, the pushing device comprises: a target object 200 and a pushing end, the pushing end is used for pushing the target object 200 relative to the fixed end 100. The target object 200 can be the host computer and / or the 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 comprises one or more limiting structures 300 according to any one of the above technical solutions, and the limiting structure 300 is installed on the fixed end 100 and is used for stopping the target object 200.

[0081] The pushing device of the utility model comprises the limiting structure 300 according to any one of the above technical solutions, and thus has all the beneficial effects of the limiting structure 300 according to any one of the above technical solutions, which will not be repeated here.

[0082] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the present application, but not limited to; although the present application is described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still be modified to the technical solutions recorded in the foregoing examples, or part of the technical features are replaced; 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 embodiments of the present application.

Claims

1. A limiting structure, characterized in that, The limiting structure (300) comprises: a mounting portion (310) for fixedly mounting the limiting structure (300); a limiting piece (320) comprising a head end (320a) and a tail end (320b), the tail end (320b) being connected with the mounting portion (310), and the head end (320a) being movable relative to the tail end (320b) so that the limiting piece (320) switches between at least two states including a first state and a second state; wherein the limiting piece (320) stops the target object (200) in the first state and avoids the target object (200) in the second state.

2. The limiting structure according to claim 1, wherein, The head end (320a) and the tail end (320b) are detachably connected with each other.

3. The limiting structure according to claim 1, wherein The limiting structure (300) further comprises: a locking piece for locking the head end (320a) relative to the tail end (320b) so that the limiting piece (320) remains in the first state.

4. The limiting structure according to claim 1, wherein: the head end (320a) and the tail end (320b) are connected through a ball hinge structure; or the head end (320a) and the tail end (320b) are connected through a pin shaft structure.

5. The position-limiting structure according to claim 1, characterized in that, The limiting structure (300) further comprises: a first pin shaft (330) penetrating through the head end (320a) and the tail end (320b) to rotationally connect the two; a second pin shaft (340) being movably inserted into the head end (320a) and the tail end (320b) to lock the two so that the limiting structure (300) remains in the first state.

6. The limiting structure according to claim 5, wherein, The head end (320a) comprises two first abutting pieces (322), the tail end (320b) comprises a second abutting piece (321) arranged between the two first abutting pieces (322), and the first pin shaft (330) and the second pin shaft (340) respectively penetrate through the first abutting pieces (322) and the second abutting piece (321), and the first abutting pieces (322) and the second abutting piece (321) abut against each other.

7. The limiting structure according to claim 6, wherein The first abutting pieces (322) are formed as flat plate structures, and the second abutting piece (321) has a flat surface, and the first abutting pieces (322) and the flat surface abut against each other.

8. The position-limiting structure according to claim 1, characterized in that, The head end (320a) has a convex surface, and the tail end (320b) has a concave surface, and the head end (320a) and the tail end (320b) are concave-convex matched at the connection position so that the head end (320a) can rotate relative to the tail end (320b).

9. The limiting structure according to claim 8, wherein, The limiting structure (300) further comprises: a bolt (370) connecting the head end (320a) and the tail end (320b) with each other at the connection position; wherein the head end (320a) can rotate relative to the tail end (320b) around the bolt (370).

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 a fixed end (100); one or more limiting structures (300) as claimed in any one of claims 1 to 9, mounted on the fixed end (100) and for stopping the target object (200).

Images