CN220730216U - Road surface compactness detection device for engineering supervision - Google Patents

Abstract

The application relates to the technical field of road detection, and discloses a road surface compactness detection device for engineering supervision, including first backup pad, first pneumatic cylinder, movable plate, first mounting panel, second pneumatic cylinder, movable arm and arc. In the use process, the first hydraulic cylinder is controlled to work, and the moving end of the first hydraulic cylinder can drive the moving plate to do linear motion. Finally, the arc plates can do linear motion, so that the arc plates can be inserted into the ground or removed from the ground. The movable ends of the second hydraulic cylinders are controlled to be in a retreating state, and the cylinders can be enclosed by the arc-shaped plates. At this time, a plurality of arc plates are inserted into the ground, so that the sample pavement to be sampled can be separated from other pavement to form an annular gap. And then the movable ends of the second hydraulic cylinders are controlled to be in an extending state, and the arc-shaped plates can be separated from each other, so that the annular gap is enlarged. Thereby facilitating the insertion of the clamp into the annular gap to remove the sample.

Description

Road surface compactness detection device for engineering supervision

Technical Field

The application relates to the technical field of road detection, for example, to a road surface compactness detection device for engineering supervision.

Background

At present, the compaction quality of roadbed and pavement is one of the most important internal indexes for road engineering construction quality management. Related art (publication number: CN 216621825U) discloses a road surface compactness detecting device for highway engineering supervision, which includes a pair of upright plates disposed opposite to each other. The top of riser fixedly connected with center offered the backup pad of through-hole. The upper end face of backup pad is provided with a pair of pole setting of vertical setting, and the fixed plate of through-hole has been seted up at the top fixedly connected with center of pole setting. And a sleeve is fixedly connected between the through hole of the supporting plate and the through hole of the fixing plate. The fixed plate is fixedly connected with a motor which is vertically downward, and a rotating shaft of the motor is sleeved in the sleeve. The rotating shaft of the motor is fixedly connected with a screw rod, and a threaded cylinder for being matched with the screw rod is sleeved outside the screw rod. The outer wall of the thread cylinder is fixedly connected with a balance rod which is horizontally arranged, and the balance rod is slidably arranged Yu Liban. The measuring cylinder for sampling on the road surface is fixedly arranged below the threaded cylinder.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

when sampling is carried out, the measuring cylinder is driven by the motor to do linear motion. When the measuring cylinder is inserted into the ground and removed, an annular gap can be formed on the road surface. And then a worker can take out the sample positioned at the inner side of the annular gap through the clamp so as to detect the compactness of the sample. However, since the size of the measuring cylinder is fixed, the width of the annular gap is the thickness of the side wall of the measuring cylinder. It is not easy to extend the clamp into the annular gap to clamp out the sample located inside the annular gap.

It should be noted that the information disclosed in the foregoing background section is only for enhancing understanding of the background of the present application and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows.

The embodiment of the disclosure provides a road surface compactness detection device for engineering supervision, so as to take out a sample.

In some embodiments, the road compactness detection device for engineering supervision comprises: a first support plate; the first hydraulic cylinder is arranged on the first supporting plate, and the moving end of the first hydraulic cylinder passes through the first supporting plate; the moving plate is connected to the moving end of the first hydraulic cylinder; a first mounting plate connected to the moving plate; the second mounting plates are uniformly connected with the first mounting plates, and the plane of each second mounting plate is mutually perpendicular to the plane of the first mounting plate; the second hydraulic cylinders are respectively arranged on each second mounting plate, and the axes of the moving ends of each second hydraulic cylinder are mutually perpendicular to the plane where the second mounting plates connected with the second hydraulic cylinders are located; the movable arms are respectively connected with the movable end of each second hydraulic cylinder; the arc-shaped plates are respectively connected with each movable arm; when the moving ends of the second hydraulic cylinders are in an extending state, the arc-shaped plates are separated from each other; when the movable ends of the second hydraulic cylinders are in a retreating state, the arc-shaped plates enclose a cylinder.

Optionally, the method further comprises: a first linear bearing mounted to the first support plate; the first guide shaft is slidably arranged in the first linear bearing, and one end of the guide shaft is connected with the moving plate; the moving direction of the first guide shaft relative to the first linear bearing is the same as the moving direction of the moving end of the first hydraulic cylinder.

Optionally, the method further comprises: and the fixed ring is arranged at the other end of the first guide shaft and used for limiting.

Optionally, the method further comprises: the second linear bearings are respectively arranged on each second mounting plate; the second guide shafts are respectively and slidably arranged in each second linear bearing and are connected with the movable arms adjacent to the second linear bearings; the relative movement direction of the second guide shaft and the second linear bearing which are arranged on the same center line is the same as the movement direction of the moving end of the second hydraulic cylinder adjacent to the second guide shaft.

Optionally, the method further comprises: and the floating joint is arranged between the moving plate and the moving end of the first hydraulic cylinder.

Optionally, the method further comprises: the plane of the second support plate is parallel to the plane of the first support plate, and the second support plate comprises a through hole; a support bar connected between opposite faces of the second support plate and the first support plate; the arc plates can move in the through holes under the driving of the first hydraulic cylinder and the second hydraulic cylinders.

Optionally, the method further comprises: the universal wheel is connected to the second supporting plate and used for supporting; the hand pushing frame is connected with the second supporting plate and used for being held; and the universal wheels and the hand pushing frame are positioned at two sides of the second supporting plate along the thickness direction of the second supporting plate.

Optionally, the method further comprises: the protection plates are connected to the second support plate and located on two sides of the second support plate along the length direction of the second support plate; wherein, the universal wheel is located both sides between the guard plate.

Optionally, the method further comprises: and the reinforcing plates are respectively connected with the contact positions of the supporting rods, the first supporting plate and the second supporting plate.

The embodiment of the disclosure provides a road surface compactness detection device for engineering supervision, which can realize the following technical effects:

the embodiment of the disclosure provides a road surface compactness detection device for engineering supervision, including first backup pad, first pneumatic cylinder, movable plate, first mounting panel, second pneumatic cylinder, movable arm and arc. The first support plate is used for supporting and installing the first hydraulic cylinder. The first hydraulic cylinder is mounted on the first support plate, and the moving end of the first hydraulic cylinder penetrates through the first support plate and is used for providing driving force. The movable plate is connected to the movable end of the first hydraulic cylinder and is driven by the first hydraulic cylinder to perform linear movement. The first mounting plate is connected to the moving plate and moves synchronously with the moving plate. The second mounting plates are uniformly connected to the first mounting plates, and the plane of each second mounting plate is mutually perpendicular to the plane of the first mounting plate and is used for supporting the second hydraulic cylinder. The second hydraulic cylinders are respectively arranged on each second mounting plate, and the axes of the moving ends of each second hydraulic cylinder are mutually perpendicular to the plane of the second mounting plate connected with the second hydraulic cylinders, and are respectively used for providing driving force. The movable arms are respectively connected with the movable end of each second hydraulic cylinder and respectively perform linear movement under the driving of the second hydraulic cylinders. The arc-shaped plates are respectively connected to each movable arm and respectively move synchronously with each movable plate. When the movable ends of the second hydraulic cylinders are in the extending state, the arc plates are separated from each other. When the movable ends of the second hydraulic cylinders are in a retreating state, the arc-shaped plates enclose the cylinder.

In the use process, the first hydraulic cylinder is controlled to work, and the moving end of the first hydraulic cylinder can drive the moving plate to do linear motion. Finally, the arc plates can do linear motion, so that the arc plates can be inserted into the ground or removed from the ground. The plurality of second hydraulic cylinders are controlled to work, and the moving ends of the plurality of second hydraulic cylinders can drive the plurality of moving plates to move, so that the plurality of arc plates are mutually close or mutually spread. The movable ends of the second hydraulic cylinders are controlled to be in a retreating state, and the cylinders can be enclosed by the arc-shaped plates. At this time, a plurality of arc plates are inserted into the ground, so that the sample pavement to be sampled can be separated from other pavement to form an annular gap. And then the movable ends of the second hydraulic cylinders are controlled to be in an extending state, and the arc-shaped plates can be separated from each other, so that the annular gap is enlarged. Thereby being convenient for stretch into the annular gap with anchor clamps in, conveniently take out the sample that is located annular gap inboard.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which like reference numerals refer to similar elements, and in which:

fig. 1 is a schematic cross-sectional view of a road compactness detecting device for engineering supervision according to an embodiment of the present disclosure;

FIG. 2 is an enlarged schematic view of the structure of FIG. 1 at A;

FIG. 3 is a schematic view of the structure of the view from B-B in FIG. 1;

fig. 4 is a schematic diagram of a front view structure of a road compactness detecting device for engineering supervision according to an embodiment of the present disclosure.

Reference numerals:

1: a first support plate; 2: a first hydraulic cylinder; 3: a moving plate; 4: a first mounting plate; 5: a second mounting plate; 6: a second hydraulic cylinder; 7: a moving arm; 8: an arc-shaped plate; 9: a first linear bearing; 10: a first guide shaft; 11: a second linear bearing; 12: a second guide shaft; 13: a second support plate; 14: a support rod; 15: a universal wheel; 16: a hand pushing frame; 17: a protection plate; 18: reinforcing plate.

Detailed Description

So that the manner in which the features and techniques of the disclosed embodiments can be understood in more detail, a more particular description of the embodiments of the disclosure, briefly summarized below, may be had by reference to the appended drawings, which are not intended to be limiting of the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawing.

The terms first, second and the like in the description and in the claims of the embodiments of the disclosure and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the present disclosure. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are used primarily to better describe embodiments of the present disclosure and embodiments thereof and are not intended to limit the indicated device, element, or component to a particular orientation or to be constructed and operated in a particular orientation. Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the embodiments of the present disclosure will be understood by those of ordinary skill in the art in view of the specific circumstances.

In addition, the terms "disposed," "connected," "secured" and "affixed" are to be construed broadly. For example, "connected" may be in a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the embodiments of the present disclosure may be understood by those of ordinary skill in the art according to specific circumstances.

The term "plurality" means two or more, unless otherwise indicated.

In the embodiment of the present disclosure, the character "/" indicates that the front and rear objects are an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, a and/or B, represent: a or B, or, A and B.

It should be noted that, without conflict, the embodiments of the present disclosure and features of the embodiments may be combined with each other.

As shown in fig. 1 to 4, an embodiment of the present disclosure provides a road surface compactness detection device for engineering supervision, which includes a first support plate 1, a first hydraulic cylinder 2, a moving plate 3, a first mounting plate 4, a second mounting plate 5, a second hydraulic cylinder 6, a moving arm 7, and an arc plate 8. The first hydraulic cylinder 2 is mounted on the first support plate 1, and the moving end of the first hydraulic cylinder 2 passes through the first support plate 1. The moving plate 3 is connected to the moving end of the first hydraulic cylinder 2. The first mounting plate 4 is connected to the moving plate 3. The second mounting plates 5 are uniformly connected to the first mounting plates 4, and the plane of each second mounting plate 5 is perpendicular to the plane of the first mounting plate 4. The second hydraulic cylinders 6 are respectively installed on each second installation plate 5, and the axis of the moving end of each second hydraulic cylinder 6 is mutually perpendicular to the plane of the second installation plate 5 connected with the second hydraulic cylinder. The moving arms 7 are respectively connected to the moving ends of each second hydraulic cylinder 6. An arcuate plate 8 is connected to each of the moving arms 7, respectively. Wherein, when the movable ends of the second hydraulic cylinders 6 are in the extending state, the arc plates 8 are separated from each other. When the movable ends of the second hydraulic cylinders 6 are in the retreated state, the arcuate plates 8 enclose a cylinder.

The embodiment of the disclosure provides a road surface compactness detection device for engineering supervision, which comprises a first support plate 1, a first hydraulic cylinder 2, a movable plate 3, a first mounting plate 4, a second mounting plate 5, a second hydraulic cylinder 6, a movable arm 7 and an arc plate 8. The first support plate 1 is used for supporting and mounting the first hydraulic cylinder 2. The first hydraulic cylinder 2 is mounted to the first support plate 1, and a moving end of the first hydraulic cylinder 2 passes through the first support plate 1 for providing a driving force. The moving plate 3 is connected to the moving end of the first hydraulic cylinder 2, and is driven by the first hydraulic cylinder 2 to perform linear motion. The first mounting plate 4 is connected to the moving plate 3 and moves synchronously with the moving plate 3. The second mounting plates 5 are uniformly connected to the first mounting plates 4, and the plane of each second mounting plate 5 is perpendicular to the plane of the first mounting plate 4 and is used for supporting the second hydraulic cylinder 6. The second hydraulic cylinders 6 are respectively installed on each second installation plate 5, and the axes of the moving ends of each second hydraulic cylinder 6 are mutually perpendicular to the plane of the second installation plate 5 connected with the second hydraulic cylinder, and are respectively used for providing driving force. The moving arms 7 are respectively connected to the moving ends of each second hydraulic cylinder 6, and respectively perform linear movement under the driving of the second hydraulic cylinders 6. The arcuate plates 8 are respectively connected to each of the moving arms 7 and respectively move in synchronization with each of the moving plates 3. Wherein, when the movable ends of the second hydraulic cylinders 6 are in the extending state, the arc plates 8 are separated from each other. When the movable ends of the second hydraulic cylinders 6 are in the retreated state, the arcuate plates 8 enclose a cylinder.

In the use process, the first hydraulic cylinder 2 is controlled to work, and the moving end of the first hydraulic cylinder 2 can drive the moving plate 3 to do linear motion. Finally, the plurality of curved plates 8 can be linearly moved, so that the plurality of curved plates 8 can be inserted into or removed from the ground. The plurality of second hydraulic cylinders 6 are controlled to work, and the moving ends of the plurality of second hydraulic cylinders 6 can drive the plurality of moving plates 3 to move, so that the plurality of arc plates 8 are mutually close or mutually spread. The moving ends of the second hydraulic cylinders 6 are controlled to be in a retreated state, and the cylinders can be enclosed by the arc plates 8. At this time, the plurality of arc plates 8 are inserted into the ground, so that the sample road surface to be sampled can be separated from other road surfaces to form an annular gap. And then the moving ends of the second hydraulic cylinders 6 are controlled to be in an extending state, and the arc plates 8 can be separated from each other, so that the annular gap is enlarged. Thereby being convenient for stretch into the annular gap with anchor clamps in, conveniently take out the sample that is located annular gap inboard.

Optionally, as shown in connection with fig. 1 and 4, a first linear bearing 9 and a first guiding shaft 10 are also included. The first linear bearing 9 is mounted to the first support plate 1. The first guide shaft 10 is slidably mounted in the first linear bearing 9, and one end of the guide shaft is connected to the moving plate 3. Wherein the direction of movement of the first guiding axle 10 relative to the first linear bearing 9 is the same as the direction of movement of the moving end of the first hydraulic cylinder 2.

In the disclosed embodiment, a first linear bearing 9 and a first guide shaft 10 are also included. The first linear bearings 9 and the first guide shafts 10 function as guide supports to improve stability when the moving plate 3 moves. And the radial force applied to the moving end of the first hydraulic cylinder 2 is reduced, and the service life of the first hydraulic cylinder 2 is prolonged.

Optionally, as shown in connection with fig. 1 and 4, a securing ring is also included. The fixed ring is mounted at the other end of the first guide shaft 10 for limiting.

In the embodiment of the present disclosure, a fixing ring mounted to the first guide shaft 10 is further included. The fixing ring is used for limiting, so that the first guide shaft 10 is prevented from falling off from the first linear bearing 9.

Optionally, as shown in connection with fig. 1 to 4, a second linear bearing 11 and a second guide shaft 12 are also included. A second linear bearing 11 is mounted to each second mounting plate 5. The second guide shafts 12 are slidably mounted in each second linear bearing 11, respectively, and are connected to the moving arm 7 adjacent thereto. Wherein the relative movement direction of the second guide shaft 12 and the second linear bearing 11 arranged with the center line is the same as the movement direction of the moving end of the second hydraulic cylinder 6 adjacent thereto.

In the embodiment of the present disclosure, a second linear bearing 11 and a second guide shaft 12 are further included. The second linear bearing 11 and the second guide shaft 12 function as guide supports to improve stability when the moving arm 7 moves. And the radial force applied to the moving end of the second hydraulic cylinder 6 is reduced, and the service life of the second hydraulic cylinder 6 is prolonged.

Optionally, as shown in connection with fig. 1 and 4, a floating joint is also included. A floating joint is mounted between the moving plate 3 and the moving end of the first hydraulic cylinder 2.

In the disclosed embodiment, a floating joint is also included, which is mounted between the moving plate 3 and the moving end of the first hydraulic cylinder 2. The floating joint is used for eliminating errors, protecting related components and enabling equipment to run stably, so that the service life of the equipment is prolonged.

Optionally, as shown in connection with fig. 1 and 4, a second support plate 13 and a support bar 14 are also included. The plane of the second support plate 13 is parallel to the plane of the first support plate 1, and the second support plate 13 includes a through hole. The support bar 14 is connected between the second support plate 13 and the opposite face of the first support plate 1. Wherein, the plurality of arc plates 8 can move in the through holes under the drive of the first hydraulic cylinder 2 and the plurality of second hydraulic cylinders 6.

In the embodiment of the present disclosure, a second support plate 13 and a support rod 14 are further included. The support bar 14 is connected between opposite faces of the second support plate 13 and the first support plate 1 to determine the relative positions of the second support plate 13 and the first support plate 1. The second support plate 13 includes a through hole for accommodating the plurality of arc plates 8, and in use, the plurality of arc plates 8 can move in the through hole under the driving of the first hydraulic cylinder 2 and the plurality of second hydraulic cylinders 6 to complete the sampling work.

Optionally, as shown in connection with fig. 1 and 4, a universal wheel 15 and a hand rest 16 are also included. The universal wheel 15 is connected to the second support plate 13 for support. The hand pushing frame 16 is connected to the second support plate 13 for holding. Wherein, the universal wheel 15 and the hand pushing frame 16 are positioned at both sides of the second support plate 13 in the thickness direction of the second support plate 13.

In the disclosed embodiment, a universal wheel 15 and a hand rest 16 are also included. The universal wheel 15 is used to support the whole device in order to move the whole device. The hand rest 16 is intended to be held by the user in order to facilitate the movement of the whole device.

Optionally, as shown in connection with fig. 1 and 4, a shielding plate 17 is also included. The protection plate 17 is connected to the second support plate 13, and the protection plate 17 is located at both sides of the second support plate 13 along the length direction of the second support plate 13. Wherein the universal wheel 15 is located between the two side shields 17.

In the embodiment of the present disclosure, the protection plate 17 connected to the second support plate 13 and located at both sides of the universal wheel 15 is further included. The protection plate 17 is used for playing a role of safety protection so as to prevent the universal wheel 15 from directly colliding with the ground bulge when the device runs on an uneven bottom surface.

Optionally, as shown in connection with fig. 1 and 4, a reinforcing plate 18 is also included. The reinforcing plates 18 are respectively connected to the support rods 14 at the contact points with the first support plate 1 and the second support plate 13.

In the embodiment of the present disclosure, the reinforcing plates 18 are further included, which are respectively connected to the support rods 14 where they contact the first support plate 1 and the second support plate 13. The reinforcing plate 18 plays a role of improving the connection strength to prevent the supporting rod 14 from being broken or deformed by external force when being in contact with the first and second supporting plates 1 and 13.

The above description and the drawings illustrate embodiments of the disclosure sufficiently to enable those skilled in the art to practice them. Other embodiments may include structural and other modifications. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in, or substituted for, those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (9)

1. Road surface compactness detection device for engineering supervision, characterized by comprising:

a first support plate;

the first hydraulic cylinder is arranged on the first supporting plate, and the moving end of the first hydraulic cylinder passes through the first supporting plate;

the moving plate is connected to the moving end of the first hydraulic cylinder;

a first mounting plate connected to the moving plate;

the second mounting plates are uniformly connected with the first mounting plates, and the plane of each second mounting plate is mutually perpendicular to the plane of the first mounting plate;

the second hydraulic cylinders are respectively arranged on each second mounting plate, and the axes of the moving ends of each second hydraulic cylinder are mutually perpendicular to the plane where the second mounting plates connected with the second hydraulic cylinders are located;

the movable arms are respectively connected with the movable end of each second hydraulic cylinder;

the arc-shaped plates are respectively connected with each movable arm;

when the moving ends of the second hydraulic cylinders are in an extending state, the arc-shaped plates are separated from each other; when the movable ends of the second hydraulic cylinders are in a retreating state, the arc-shaped plates enclose a cylinder.

2. The road surface compactness detection device for engineering supervision according to claim 1, further comprising:

a first linear bearing mounted to the first support plate;

the first guide shaft is slidably arranged in the first linear bearing, and one end of the guide shaft is connected with the moving plate;

the moving direction of the first guide shaft relative to the first linear bearing is the same as the moving direction of the moving end of the first hydraulic cylinder.

3. The road surface compactness detection device for engineering supervision according to claim 2, further comprising:

and the fixed ring is arranged at the other end of the first guide shaft and used for limiting.

4. The road surface compactness detection device for engineering supervision according to claim 1, further comprising:

the second linear bearings are respectively arranged on each second mounting plate;

the second guide shafts are respectively and slidably arranged in each second linear bearing and are connected with the movable arms adjacent to the second linear bearings;

the relative movement direction of the second guide shaft and the second linear bearing which are arranged on the same center line is the same as the movement direction of the moving end of the second hydraulic cylinder adjacent to the second guide shaft.

5. The road surface compactness detection device for engineering supervision according to claim 1, further comprising:

and the floating joint is arranged between the moving plate and the moving end of the first hydraulic cylinder.

6. The road surface compactness detection device for engineering supervision according to any one of claims 1 to 5, further comprising:

the plane of the second support plate is parallel to the plane of the first support plate, and the second support plate comprises a through hole;

a support bar connected between opposite faces of the second support plate and the first support plate;

the arc plates can move in the through holes under the driving of the first hydraulic cylinder and the second hydraulic cylinders.

7. The road surface compactness detection device for engineering supervision according to claim 6, further comprising:

the universal wheel is connected to the second supporting plate and used for supporting;

the hand pushing frame is connected with the second supporting plate and used for being held;

and the universal wheels and the hand pushing frame are positioned at two sides of the second supporting plate along the thickness direction of the second supporting plate.

8. The road surface compactness detection device for engineering supervision according to claim 7, further comprising:

the protection plates are connected to the second support plate and located on two sides of the second support plate along the length direction of the second support plate;

wherein, the universal wheel is located both sides between the guard plate.

9. The road surface compactness detection device for engineering supervision according to claim 6, further comprising:

and the reinforcing plates are respectively connected with the contact positions of the supporting rods, the first supporting plate and the second supporting plate.