CN217318084U - Lifting mechanism and inspection vehicle - Google Patents

Abstract

The utility model provides an elevating system and inspection vehicle, wherein, elevating system includes: the device comprises n-stage push rods which are nested with each other, an n-1-stage limiting structure for limiting the push rods to rotate, an n-1-stage screw rod, an n-1-stage nut in threaded fit with the n-1-stage screw rod and a driving structure. The driving structure is in driving connection with the first-stage screw rod so as to extend or retract the n-stage push rod. Use the technical scheme of the utility model, elevating system has and extends to the longest state of stretching out and retract to the shortest state of retracting, and above-mentioned structure makes elevating system length value when stretching out the state accord with under the condition of design value, and the length when retracting to the state of retracting is shorter to focus when effectively reducing elevating system retraction, and then improved the holistic stability of inspection car.

Description

Lifting mechanism and inspection vehicle

Technical Field

The utility model relates to a patrol and examine the device field, particularly, relate to an elevating system and inspection vehicle.

Background

The inspection wheel type robot is more and more widely applied at present. The inspection wheeled robot needs to be provided with a lifting mechanism because the inspection wheeled robot has the problem that the inspection position is positioned at a high position in the walking detection.

The lifting mechanism of the inspection wheel type robot in the prior art comprises two-stage push rods which are nested with each other, wherein a rotatable screw rod and a nut which is sleeved on the screw rod are arranged in the two-stage push rods, and the nut is connected with the second-stage push rod. The driving device drives the screw rod to rotate, the screw rod rotates to drive the nut to move up and down, and the nut drives the second-stage push rod to move up and down to enable the lifting mechanism to extend and retract.

Although the robot having the above-described configuration can raise the detection device to the high position to perform high position detection, the robot having the above-described configuration has a high center of gravity when the elevating mechanism is retracted, and thus has poor overall stability.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide an elevating system and a patrol car, which solve the problem of high gravity center when the elevating system in the prior art retracts.

In order to achieve the above object, according to an aspect of the present invention, there is provided an elevating mechanism including: n stages of push rods, wherein n is more than or equal to 3, and each stage of push rods except the first stage of push rods are nested in the push rods of the previous stage; each level of the n-1 level of limiting structures is arranged between the push rod of the corresponding level and the push rod of the next level so as to limit the rotation between the adjacent two levels of push rods; each stage of the n-1 stage of the screw rods is pivotally arranged in the push rod of the corresponding stage, and the screw rods of the adjacent two stages are fixedly connected; each stage of the n-1 stage of nuts is matched with the corresponding stage of screw rod and is fixedly connected with the next stage of push rod; and the driving structure is in driving connection with the first-stage screw rod so as to extend or retract the n-stage push rod.

In one embodiment, the drive structure is disposed within the first stage pushrod.

In one embodiment, the driving mechanism is a motor, and the lifting mechanism further comprises: the motor fixing frame is provided with a through hole, the motor fixing frame is fixed in the first-stage push rod, the motor is fixedly connected with the motor fixing frame, and an output shaft of the motor penetrates out of the through hole to be in driving connection with the first-stage screw rod.

In one embodiment, a motor sleeve is sleeved on the output shaft.

In one embodiment, the lift mechanism further comprises: each stage of the n-1 stage bearing block is fixed on the inner wall of the push rod of the corresponding stage, wherein a bearing is arranged on the bearing block of the first stage, the top of the first stage screw rod penetrates through the bearing, and the bearing blocks of other stages are in nested fit with the corresponding nuts of the previous stage.

In one embodiment, each of the stages of nuts except the last stage includes a nut body and a mounting head provided at a top end of the nut body, and the elevating mechanism further includes: each level of the n-2 level cover plate is provided with a limiting hole, the next level of screw rod corresponding to the level of the cover plate penetrates through the limiting hole, and each level of the cover plate is connected with the mounting head of the corresponding level of nut to cover the joint of the two adjacent levels of screw rods.

In one embodiment, the nut is secured to the bottom of the push rod.

In one embodiment, the screw rods of other stages except the first stage screw rod are hollow rods, and internal threads are arranged in the hollow rods, and the lifting mechanism further comprises: the inner hole of each stage of the n-2 stage fixing nuts is provided with internal threads to be matched with the external threads of the corresponding stage of the screw rod, and the outer surface of each stage of the fixing nuts is provided with external threads to be matched with the internal threads of the next stage of the screw rod corresponding to the stage of the fixing nuts.

In one embodiment, the limiting structures are sealing rings, the limiting structures of each stage are fixed at the tops of the inner walls of the push rods of the corresponding stage, limiting protrusions are arranged on the inner surfaces of the sealing rings, vertical limiting grooves are formed in the outer walls of the push rods except for the first stage, and the limiting protrusions extend into the limiting grooves.

According to the utility model discloses an on the other hand provides a patrol and examine car, include: a vehicle body; the lifting mechanism is arranged on the vehicle body and is the lifting mechanism; and the detection device is arranged on the push rod at the last stage of the lifting mechanism.

Use the technical scheme of the utility model, elevating system includes multistage push rod (tertiary and more than tertiary), if length when multistage push rod extends to the longest state is the same with the longest length among the prior art, length when multistage push rod withdraws to the shortest state so will still be short than elevating system's among the prior art shortest length still, can effectively reduce elevating system's focus like this to reduce whole centre of patrolling and examining wheeled robot, thereby improve the holistic stability of robot. In addition, above-mentioned structure makes elevating system's multistage push rod can extend in step to guarantee that elevating system rises to predetermined height's time shorter, improved the efficiency of patrolling and examining wheeled robot.

In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.

Drawings

The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention. On the attachment

In the figure:

fig. 1 shows a longitudinal section of an embodiment of a lifting mechanism according to the invention;

fig. 2 shows an enlarged schematic view of the lifting mechanism of fig. 1 at a;

fig. 3 shows an enlarged schematic view of the lifting mechanism of fig. 1 at B;

FIG. 4 shows a cross-sectional schematic view of a spacing structure of the lift mechanism of FIG. 1; and

fig. 5 shows a schematic perspective view of a patrol vehicle according to the present invention.

Wherein the figures include the following reference numerals:

10. a push rod; 20. a limiting structure; 21. a limiting bulge; 30. a screw rod; 40. a nut; 41. a nut body; 42. a mounting head; 50. a drive structure; 51. an output shaft; 60. a motor fixing frame; 70. a motor shaft sleeve; 80. a bearing seat; 90. a bearing; 100. a cover plate; 101. a limiting hole; 110. fixing a nut; 120. a vehicle body; 130. a lifting mechanism; 140. and (4) a detection device.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances for describing embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

As shown in fig. 1, in the present embodiment, the elevating mechanism includes: n-level push rods, n-1 level limiting structures, n-1 level screw rods, n-1 level nuts and a driving structure 50. Wherein n is more than or equal to 3, and each stage of push rods 10 except the first stage of push rods in the n stages of push rods are nested in the push rods 10 of the previous stage. Each of the n-1 stage position limiting structures 20 is disposed between the push rod 10 of the corresponding stage and the push rod 10 of the next stage to limit rotation between the push rods 10 of the adjacent stages. Each stage of the n-1 stage screw rods 30 can be pivotally arranged in the corresponding stage of the push rod 10, and the screw rods 30 of the adjacent two stages are fixedly connected. Each stage of the n-1 stage nuts 40 is matched with the corresponding stage of the screw rod 30 and is fixedly connected with the next stage of the push rod 10. The driving structure 50 is drivingly connected with the first stage lead screw 30 to extend or retract the n-stage push rod.

By applying the technical scheme of the embodiment, the lifting mechanism comprises the multistage push rods (three stages and more than three stages), if the length of the multistage push rods extending to the longest state is the same as the longest length in the prior art, the length of the multistage push rods retracting to the shortest state is shorter than the shortest length of the lifting mechanism in the prior art, so that the gravity center of the lifting mechanism can be effectively reduced, the gravity center of the whole inspection wheeled robot is reduced, and the overall stability of the robot is improved. In addition, above-mentioned structure makes elevating system's multistage push rod can extend in step to guarantee that elevating system rises to predetermined height's time shorter, improved the efficiency of patrolling and examining wheeled robot.

In this embodiment, n is 3. Specifically, 3 level push rods include first level push rod, second level push rod and third level push rod, and 2 level limit structure includes first level limit structure and second level limit structure, and 2 level lead screw includes first level lead screw and second level lead screw, and 2 level nut includes first level nut and second level nut. As shown in figure 1, the first-stage push rod, the second-stage push rod and the third-stage push rod are sequentially arranged from bottom to top, the second-stage push rod is nested in the first-stage push rod, and the third-stage push rod is nested in the second-stage push rod. The first-stage limiting structure is arranged between the first-stage push rod and the second-stage push rod so that the second-stage push rod cannot rotate, and the second-stage limiting structure is arranged between the second-stage push rod and the third-stage push rod so that the third-stage push rod cannot rotate. The first-stage screw rod is arranged in the first-stage push rod in a pivoted mode, the second-stage push rod is arranged in the second-stage push rod in a pivoted mode, and the first-stage screw rod is fixedly connected with the second-stage screw rod. The first-stage nut is matched with the first-stage screw rod and fixedly connected with the second-stage push rod, and the second-stage nut is matched with the second-stage screw rod and fixedly connected with the third-stage push rod.

The following describes the lifting process of the lifting mechanism specifically:

the driving structure 50 drives the first stage screw rod to rotate. Because the second stage push rod can not rotate, the first stage nut fixed with the second stage push rod can not rotate. When the first-stage screw rod is driven to rotate, the first-stage screw rod is in threaded fit with the first-stage nut, so that the first-stage nut generates axial movement. The first-stage nut drives the second-stage push rod to axially move, and the purpose that the second-stage push rod retracts towards the inside of the first-stage push rod or the second-stage push rod extends towards the outside of the first-stage push rod is achieved. And when the second-stage push rod moves, the first-stage screw rod drives the second-stage screw rod connected with the first-stage screw rod to rotate. Because the third-stage push rod cannot rotate, the second-stage nut fixed with the third-stage push rod cannot rotate. When the second-stage screw rod is driven to rotate, the second-stage screw rod is in threaded fit with the second-stage nut, so that the second-stage nut generates axial movement. The second-stage nut drives the third-stage push rod to axially move, and the purpose that the third-stage push rod retracts towards the inside of the second-stage push rod or the third-stage push rod extends out of the second-stage push rod is achieved.

As shown in fig. 1, in the present embodiment, the driving structure 50 is disposed inside the first-stage push rod 10. On one hand, the driving structure 50 is prevented from being influenced by external water vapor or dust, and the service life of the driving structure 50 is ensured; on the other hand, the lifting mechanism is a mature module due to the structure, the lifting mechanism is not influenced by the structure of the body of the inspection wheel type robot during installation, and can be adapted to vehicles with different structures and sizes, so that the universality is good. In addition, the driving structure is arranged in the first-stage push rod 10 at the lowest part, so that the overall gravity center of the lifting mechanism can be effectively reduced, and the stability of the lifting mechanism is ensured.

As shown in fig. 1 and 2, in the present embodiment, the driving structure 50 is a motor, and the lifting mechanism further includes: a motor fixing bracket 60. The motor fixing frame 60 is provided with a through hole, the motor fixing frame 60 is fixed in the first-stage push rod 10, the motor is fixedly connected with the motor fixing frame 60, and the output shaft 51 of the motor penetrates out of the through hole to be in driving connection with the first-stage screw rod 30. The structure enables the driving structure 50 to be firmly installed in the first-stage push rod 10, greatly reduces the shaking amount of the driving structure 50 in the first-stage push rod 10 during working, and ensures the stability of the lifting mechanism in the lifting process.

As shown in fig. 1 and 2, in the present embodiment, a motor sleeve 70 is fitted over the output shaft 51. The motor shaft sleeve 70 has a protective effect on the output shaft 51, so that the service life of the lifting mechanism is ensured.

As shown in fig. 1 to 3, in the present embodiment, the lifting mechanism further includes: the bearing support structure comprises n-1 stages of bearing supports, wherein each stage of the bearing support 80 in the n-1 stage of bearing supports is fixed on the inner wall of the push rod 10 of the corresponding stage, a bearing 90 is arranged on the bearing support 80 of the first stage, the top of the first stage lead screw 30 penetrates through the bearing 90, and the bearing supports 80 of other stages are in nested fit with the corresponding nut 40 of the previous stage. Specifically, in this embodiment, elevating system still includes 2 grades of bearing frames, and 2 grades of bearing frames include first order bearing frame and second level bearing frame, and the first order bearing frame is fixed on the inner wall of first order push rod, and is provided with bearing 90 on the first order bearing frame, and the second level bearing frame is fixed on the inner wall of second level push rod, and the nested cooperation of second level bearing frame and first order nut, and first order nut passes through second level bearing frame and second level push rod fixed connection promptly. In this embodiment, the both ends of first order lead screw are spacing by first order bearing frame and second level bearing frame respectively, reduce the rocking when first order lead screw rotates. The first end of the second-stage screw rod is connected with the first-stage screw rod, and the second end of the second-stage screw rod is limited through the second-stage nut, so that the shaking of the second-stage screw rod during rotation is reduced. The structure can reduce the shaking amount of the first-stage lead screw and the second-stage lead screw during rotation, thereby ensuring the stability of the lifting mechanism in the lifting process.

As shown in fig. 1 and 3, in the present embodiment, each stage of nuts 40 except for the last stage includes a nut body 41 and a mounting head 42 disposed at the top end of the nut body 41, and the lifting mechanism further includes: each level of the n-2 level cover plate 100 is provided with a limiting hole 101, the next level of the screw rod 30 corresponding to the level of the cover plate 100 is arranged in the limiting hole 101 in a penetrating way, and each level of the cover plate 100 is connected with the mounting head 42 of the nut 40 of the corresponding level so as to cover the joint of the two adjacent levels of the screw rods 30. Specifically, in this embodiment, elevating system still includes 1 level apron, and 1 level apron includes first level apron, and first level apron is connected with the installation head of first order nut, and the two is connected the back and can cover the junction of first order lead screw and second level lead screw just, reduces the shake momentum of first order lead screw and second level lead screw to guarantee elevating system at the stability of lift in-process.

As shown in fig. 1, in the present embodiment, a nut 40 is fixed to the bottom of the push rod 10. The structure can provide longer screw thread matching length, thereby effectively increasing the shrinkage of the lifting mechanism under the condition of ensuring the elongation of the lifting mechanism and achieving the purpose of shortening the length after shrinkage as much as possible under the condition of reaching the preset height.

As shown in fig. 1, in the present embodiment, the screw rods 30 of the other stages except the first stage screw rod 30 are all hollow rods, and internal threads are provided in the hollow rods, and the lifting mechanism further includes: the n-2 stage fixing nuts, each stage of the fixing nuts 110 of the n-2 stage fixing nuts is provided with an internal thread at its inner hole to be fitted with the external thread of the lead screw 30 of the corresponding stage, and the external thread of each stage of the fixing nuts 110 is provided at its outer surface to be fitted with the internal thread of the lead screw 30 of the next stage corresponding to the stage of the fixing nuts 110. Specifically, in this embodiment, elevating system still includes level 1 fixation nut, and level 1 fixation nut includes first order fixation nut, the internal thread and the first order lead screw spiro union of first order fixation nut, the external screw thread and the second level lead screw spiro union of first order fixation nut, and above-mentioned structure makes the tip of first order lead screw and the tip quick connect of second level lead screw be in the same place to improve assembly efficiency.

As shown in fig. 1 and 4, in the present embodiment, the limiting structures 20 are sealing rings, the limiting structure 20 of each stage is fixed on the top of the inner wall of the push rod 10 of the corresponding stage, the inner surface of the sealing ring is provided with a limiting protrusion 21, the outer wall of the push rod 10 except the first stage is provided with a vertical limiting groove, and the limiting protrusion 21 extends into the limiting groove. Specifically, in this embodiment, the internal surface of first order limit structure is provided with spacing arch 21, is provided with the spacing groove on the outer wall of second level push rod, and first order limit structure and the inner wall interference fit of first order push rod. The inner surface of the second-stage limiting structure is provided with a limiting bulge 21, the outer wall of the third-stage push rod is provided with a limiting groove, and the second-stage limiting structure is in interference fit with the inner wall of the second-stage push rod. The structure is simple, and the processing and the assembly are convenient. In addition, above-mentioned structure makes limit structure can play about spacing on the one hand, and on the other hand can play sealed effect, and multiple effect can be realized to a part, reduces spare part to can improve assembly efficiency, reduction in production cost.

As shown in fig. 5, the present application further provides a patrol vehicle, and an embodiment of the patrol vehicle according to the present application comprises: a car body 120, a lifting mechanism 130 and a detection device 140. The lifting mechanism 130 is disposed on the vehicle body 120, and the lifting mechanism 130 is the above-mentioned lifting mechanism. The detecting device 140 is disposed on the push rod 10 at the last stage of the elevating mechanism 130. Specifically, in the present embodiment, the lifting mechanism 130 includes a 3-stage push rod, the first stage push rod is fixed on the vehicle body 120, and the detection device 140 is fixed on the third stage push rod. Because elevating system 130 has the advantage that length is short after the shrink, consequently have its round inspection car, after elevating system 130 shrinks, holistic focus can effectively reduce to the stability of round inspection car of assurance.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Spatially relative terms, such as "above … …", "above … …", "above … …, on a surface", "above", and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A lift mechanism, comprising:

n stages of push rods, wherein n is more than or equal to 3, and each stage of push rods (10) except the first stage of push rods are nested in the push rods (10) of the previous stage;

each stage of the n-1 stage limiting structure (20) is arranged between the push rod (10) of the corresponding stage and the push rod (10) of the next stage so as to limit the rotation between the push rods (10) of the adjacent two stages;

each stage of the n-1 stage of the screw rods (30) can be pivotally arranged in the corresponding stage of the push rod (10), and the screw rods (30) of the adjacent two stages are fixedly connected;

each stage of the n-1 stage nut (40) is matched with the corresponding stage of the screw rod (30) and is fixedly connected with the next stage of the push rod (10);

and the driving structure (50) is in driving connection with the screw rod (30) of the first stage so as to extend or retract the push rod of the n stage.

2. The lifting mechanism as claimed in claim 1, characterized in that the drive structure (50) is arranged in the first stage of the push rod (10).

3. The lifting mechanism according to claim 2, wherein the drive structure (50) is a motor, the lifting mechanism further comprising:

the motor fixing frame (60) is provided with a through hole, the motor fixing frame (60) is fixed in the first stage push rod (10), the motor is fixedly connected with the motor fixing frame (60), and an output shaft (51) of the motor penetrates out of the through hole to be in driving connection with the first stage screw rod (30).

4. The lifting mechanism as claimed in claim 3, characterized in that the output shaft (51) is sleeved with a motor bushing (70).

5. The lift mechanism of claim 1, further comprising:

the bearing seat comprises n-1 stages of bearing seats, each stage of the bearing seats (80) in the n-1 stages of bearing seats is fixed on the inner wall of the corresponding stage of the push rod (10), a bearing (90) is arranged on the bearing seat (80) of the first stage, the top of the screw rod (30) of the first stage penetrates through the bearing (90), and the bearing seats (80) of other stages are in nested fit with the corresponding nuts (40) of the previous stage.

6. The elevating mechanism according to claim 1, wherein each stage of the nuts (40) other than the last stage includes a nut body (41) and a mounting head (42) provided at a top end of the nut body (41), the elevating mechanism further comprising:

the nut screw structure comprises n-2 stages of cover plates, each stage of cover plate (100) in the n-2 stages of cover plates is provided with a limiting hole (101), the screw rod (30) of the next stage corresponding to the stage of the cover plate (100) penetrates through the limiting hole (101), and the cover plate (100) of each stage is connected with the mounting head (42) of the nut (40) of the corresponding stage to cover the joint of the screw rods (30) of the two adjacent stages.

7. The lifting mechanism according to claim 1, characterized in that the nut (40) is fixed to the bottom of the push rod (10).

8. The lifting mechanism as recited in claim 1, wherein the lead screw (30) of the stages other than the first stage of the lead screw (30) is a hollow rod, and an internal thread is provided in the hollow rod, the lifting mechanism further comprising:

n-2 stages of fixing nuts, an inner hole of each stage of fixing nuts (110) of the n-2 stages of fixing nuts is provided with an internal thread to be fitted with an external thread of the lead screw (30) of the corresponding stage, and an outer surface of each stage of fixing nuts (110) is provided with an external thread to be fitted with an internal thread of the lead screw (30) of a next stage corresponding to the stage of fixing nuts (110).

9. The lifting mechanism according to claim 1, wherein the limiting structures (20) are sealing rings, the limiting structure (20) of each stage is fixed on the top of the inner wall of the push rod (10) of the corresponding stage, a limiting protrusion (21) is arranged on the inner surface of each sealing ring, a vertical limiting groove is arranged on the outer wall of the push rod (10) except the first stage, and the limiting protrusion (21) extends into the limiting groove.

10. A patrol car, comprising:

a vehicle body (120);

a lifting mechanism (130) provided on the vehicle body (120), characterized in that the lifting mechanism (130) is the lifting mechanism of any one of claims 1 to 9;

and the detection device (140) is arranged on the push rod (10) at the last stage of the lifting mechanism (130).

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