阅读说明：本技术 一种水压机测距装置 (Hydraulic press range unit ) 是由 高国武 于 2020-04-06 设计创作，主要内容包括：现在的连续成型物料例如钢管等往往需要做管件承压测试,但是现有的成型管件压力测试水压系统中,经常出现密封头与压力测试管件对接不牢固,密封不完全的情况,而这一问题通常是由于压力测试水压系统伸出密封头的位置不准确造成的,因此为了解决如上的技术问题,本技术方案公开了一种具有同步转轮的水压机测距装置来精确密封头的伸出位置,提高密封头与被测管件的密封性,本技术方案对提高生产效率起到了很大的作用。(Present continuous shaping material for example steel pipe etc. often need do the pipe fitting pressure-bearing test, but among the shaping pipe fitting pressure test hydraulic system now, often appear sealed head and pressure test pipe fitting butt joint insecure, sealed incomplete condition, and this problem is usually because the position that pressure test hydraulic system stretches out sealed head is inaccurate to be caused, consequently in order to solve technical problem as above, this technical scheme discloses a hydraulic press range unit with synchronous runner comes the position that stretches out of accurate sealed head, improve the leakproofness of sealed head and measured pipe fitting, this technical scheme has played very big effect to improving production efficiency.)

1. A distance measuring device of a hydraulic press comprises a fixed frame (1 a), a telescopic device (2 a) and a hydraulic device (3 a), wherein the telescopic device (2 a) and the hydraulic device (3 a) are installed on the fixed frame (1 a), the telescopic device (2 a) is responsible for completing butt joint and sealing with a material to be measured, the hydraulic device (3 a) is responsible for completing pressurization test on the material to be measured, the distance measuring device (4 a) is further arranged on the fixed frame (1 a), the distance measuring device (4 a) is installed on the fixed frame (1 a) and is close to the telescopic device (2 a), the distance measuring device (4 a) is further provided with a synchronous rotating wheel (4 a 1), the synchronous rotating wheel (4 a 1) is in mutual contact with the telescopic device (2 a), and when the telescopic device (2 a) is telescopic, the synchronous rotating wheel (4 a 1) moves along with the telescopic device (2 a) to rotate, thereby accurately controlling the telescopic distance of the telescopic device (2 a) according to the rotation angle of the synchronous rotating wheel (4 a 1).

2. A distance measuring device for a hydraulic press according to claim 1, characterized in that the distance measuring device (4 a) is further provided with a pressurizing device (4 a 2), the pressurizing device (4 a 2) is provided at the end of the synchronizing wheel (4 a 1), and continuously applies pressure to the synchronizing wheel (4 a 1) to ensure that the synchronizing wheel (4 a 1) always abuts against the telescoping device (2 a) and the synchronizing wheel (4 a 1) always moves synchronously relative to the telescoping device (2 a).

3. A distance measuring device for a hydraulic press according to claim 2, characterized in that said pressurizing device (4 a 2) further comprises a sliding rod (4 a2 a), a pressure spring (4 a2 b) and a mounting seat (4 a2 c), said mounting seat (4 a2 c) is provided with a sliding hole (4 a2c 1), said sliding rod (4 a2 a) is mounted in said sliding hole (4 a2c 1) and can freely extend and retract therein, said synchronizing wheel (4 a 1) is mounted at the end of said sliding rod (4 a2 a), and said pressure spring (4 a2 b) is sleeved on said sliding rod (4 a2 a) and supported between said mounting seat (4 a2 c) and said synchronizing wheel (4 a 1).

4. A distance measuring device for a hydraulic press according to claim 3, characterized in that the hole centre line of said sliding hole (4 a2c 1) is perpendicular to the direction of movement of the telescopic means (2 a), which makes the direction of telescopic movement of the sliding rod (4 a2 a) also perpendicular to the direction of movement of the telescopic means (2 a), the perpendicular arrangement reducing the measurement error caused by the up and down floating of the telescopic means (2 a) when the synchronizing wheel (4 a 1) and the telescopic means (2 a) move synchronously.

5. A distance measuring device for a hydraulic press according to claim 4, characterized in that an electronic counting device (4 a 3) is provided in said distance measuring device (4 a), said electronic counting device (4 a 3) and synchronizing wheel (4 a 1) are connected to each other and can rotate synchronously with synchronizing wheel (4 a 1), and by synchronizing the movement of synchronizing wheel (4 a 1) and telescoping device (2 a), the electronic counting device (4 a 3) can record and calculate the rotation angle of synchronizing wheel (4 a 1) so as to obtain the telescoping distance of telescoping device (2 a) by computer.

6. A distance measuring device for a hydraulic press according to any one of claims 1 to 5, characterised in that the distance measuring device (4 a) is located above the telescopic device (2 a), and the synchronizing wheel (4 a 1) in the distance measuring device (4 a) is adapted to naturally engage the upper surface of the telescopic device (2 a) under gravity, thereby ensuring that the distance measuring device (4 a) will still function properly in the event of failure of the pressurizing device (4 a 2).

7. A hydraulic press distance measuring device according to one of claims 1 to 5, characterized in that the front section of said telescopic device (2 a) is further provided with a sealing head (2 a 1), said distance measuring device (4 a) is arranged at the rear end of the sealing head (2 a 1), the lower end of said sealing head (2 a 1) is assembled and connected with the hydraulic device (3 a), and said sealing head (2 a 1) can follow the synchronous telescopic motion of said telescopic device (2 a).

8. A hydraulic press distance measuring device according to one of claims 1 to 5, characterized in that a hydraulic telescopic rod (3 a 1) is further arranged in the hydraulic device (3 a), the hydraulic telescopic rod (3 a 1) can extend or retract, and stable hydraulic pressure is provided for a hydraulic system when the sealing head (2 a 1) follows the telescopic motion of the telescopic device (2 a).

Technical Field

The invention relates to the technical field of continuous molding material pressure testing, in particular to a distance measuring device for testing a hydraulic machine.

Background

The production line in the field of continuous molding materials is mature, but after molding materials such as steel pipes, pipe fitting pressure bearing tests are often needed sometimes, if the molded pipe fitting is taken to a pressure testing machine for pressure tests, the production efficiency of the whole production line is influenced, if the production efficiency of the production line is not influenced, and the pressure tests of the molded pipe fitting can be finished according to standards, a pressure testing device is required to be added in the production line to meet the high-speed production of the production line, but in the existing molding pipe fitting pressure testing hydraulic system, the situations of unstable butt joint and incomplete sealing of a sealing head and the pressure testing pipe fitting often occur, and the problem is usually caused by the inaccurate position of the pressure testing hydraulic system extending out of the sealing head, so that the technical problems are solved, the production efficiency is improved, and the development of the distance measuring device of the hydraulic press is particularly important.

Disclosure of Invention

The embodiment of the invention provides a distance measuring device of a hydraulic press, which can more conveniently and quickly finish the butt joint of a pressure testing hydraulic system and a pipe fitting to be tested, and improve the production efficiency of the whole production line.

On one hand, the distance measuring device of the hydraulic press comprises a fixed rack (1 a), a telescopic device (2 a) and a hydraulic device (3 a), wherein the telescopic device (2 a) and the hydraulic device (3 a) are installed on the fixed rack (1 a), the telescopic device (2 a) is responsible for completing butt joint and sealing with a material to be measured, the hydraulic device (3 a) is responsible for completing pressurization test on the material to be measured, the distance measuring device is characterized in that the fixed rack (1 a) is further provided with a distance measuring device (4 a), the distance measuring device (4 a) is installed on the fixed rack (1 a) and is close to the telescopic device (2 a), the distance measuring device (4 a) is further provided with a synchronous rotating wheel (4 a 1), the synchronous rotating wheel (4 a 1) is in mutual contact with the telescopic device (2 a), and the synchronous rotating wheel (4 a 1) moves along with the telescopic device (2 a) to rotate when the telescopic device (2 a) stretches, thereby accurately controlling the telescopic distance of the telescopic device (2 a) according to the rotation angle of the synchronous rotating wheel (4 a 1).

According to one aspect of the embodiment of the invention, a pressurizing device (4 a 2) is further arranged in the distance measuring device (4 a), the pressurizing device (4 a 2) is arranged at the end part of the synchronous rotating wheel (4 a 1), and continuously applies pressure to the synchronous rotating wheel (4 a 1) to ensure that the synchronous rotating wheel (4 a 1) is always attached to the telescopic device (2 a) and the synchronous rotating wheel (4 a 1) is always synchronously moved relative to the telescopic device (2 a).

According to an aspect of the embodiment of the present invention, a sliding rod (4 a2 a), a pressure spring (4 a2 b) and a mounting seat (4 a2 c) are further disposed in the pressurizing device (4 a 2), a sliding hole (4 a2c 1) is disposed on the mounting seat (4 a2 c), the sliding rod (4 a2 a) is mounted in the sliding hole (4 a2c 1) and can freely extend and retract therein, the synchronizing wheel (4 a 1) is mounted at an end of the sliding rod (4 a2 a), and the pressure spring (4 a2 b) is sleeved on the sliding rod (4 a2 a) and supported between the mounting seat (4 a2 c) and the synchronizing wheel (4 a 1).

According to one aspect of the embodiment of the invention, the hole center line of the sliding hole (4 a2c 1) is perpendicular to the movement direction of the telescopic device (2 a), so that the telescopic movement direction of the sliding rod (4 a2 a) is also perpendicular to the movement direction of the telescopic device (2 a), and the perpendicular arrangement reduces the measurement error caused by the up-and-down floating of the telescopic device (2 a) when the synchronous rotating wheel (4 a 1) and the telescopic device (2 a) move synchronously.

According to an aspect of the embodiment of the invention, an electronic counting device (4 a 3) is further arranged in the distance measuring device (4 a), the electronic counting device (4 a 3) and the synchronizing wheel (4 a 1) are connected with each other and can rotate synchronously with the synchronizing wheel (4 a 1), and through the synchronous movement of the synchronizing wheel (4 a 1) and the telescopic device (2 a), the electronic counting device (4 a 3) can record and calculate the rotating angle of the synchronizing wheel (4 a 1) so as to obtain the telescopic distance of the telescopic device (2 a) through a computer.

According to one aspect of the embodiment of the invention, the distance measuring device (4 a) is arranged above the telescopic device (2 a), and the synchronous rotating wheel (4 a 1) in the distance measuring device (4 a) can naturally adhere to the upper surface of the telescopic device (2 a) under the gravity state, so that the distance measuring device (4 a) can still normally work under the failure state of the pressurizing device (4 a 2).

According to one aspect of the embodiment of the invention, a sealing head (2 a 1) is further arranged at the front section of the telescopic device (2 a), the distance measuring device (4 a) is arranged at the rear end of the sealing head (2 a 1), the lower end of the sealing head (2 a 1) is assembled and connected with a hydraulic device (3 a), and the sealing head (2 a 1) can synchronously move in a telescopic mode along with the telescopic device (2 a).

According to an aspect of the embodiment of the invention, a hydraulic telescopic rod (3 a 1) is further arranged in the hydraulic device (3 a), and the hydraulic telescopic rod (3 a 1) can extend or retract, so that the sealing head (2 a 1) can provide stable hydraulic pressure for a hydraulic system when following the telescopic motion of the telescopic device (2 a).

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

Description of the sequence numbers: the device comprises a fixed frame (1 a), a telescopic device (2 a), a sealing head (2 a 1), a hydraulic device (3 a), a hydraulic telescopic rod (3 a 1), a distance measuring device (4 a), a synchronous rotating wheel (4 a 1), a pressurizing device (4 a 2), a sliding rod (4 a2 a), a pressure spring (4 a2 b), a mounting seat (4 a2 c), a sliding hole (4 a2c 1), an electronic counting device (4 a 3) and a tubular material (5).

Fig. 1 is a schematic diagram of the basic structure of the embodiment of the present invention.

Fig. 2 is a schematic view of an extended structure of the telescopic device (2 a) according to the embodiment of the invention.

Fig. 3 is a schematic diagram of the working state of the first embodiment of the invention.

Fig. 4 is a schematic diagram of the working state of the second embodiment of the invention.

Fig. 5 is a schematic diagram of the working state of the third embodiment of the invention.

Fig. 6 is a schematic diagram of the working state of the fourth embodiment of the invention.

Fig. 7 is a schematic diagram of the working state of the fifth embodiment of the invention.

Fig. 8 is a schematic view of a fifth embodiment of the present invention in an upward floating state.

Fig. 9 is a schematic view of a fifth embodiment of the present invention in a downward floating state.

In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, which is defined by the claims, i.e., the invention is not limited to the preferred embodiments described.

In the description of the embodiments of the present invention, it should be noted that "perpendicular" and "parallel" are not absolute meanings in a mathematical sense unless otherwise specified, and may be understood as "substantially perpendicular" and "substantially parallel".

Fig. 1 is a schematic diagram of the basic structure of the embodiment of the present invention.

Fig. 2 is a schematic view of an extended structure of the telescopic device (2 a) according to the embodiment of the invention.

According to the drawings of fig. 1 and 2, the distance measuring device of the hydraulic press comprises a fixed frame (1 a) for supporting and positioning each part, a telescopic device (2 a) capable of realizing telescopic action and a hydraulic device (3 a) for providing test pressure, wherein the telescopic device (2 a) and the hydraulic device (3 a) are both installed on the fixed frame (1 a), the telescopic device (2 a) is arranged at the upper end position of the fixed frame (1 a), and the hydraulic device (3 a) is arranged below the telescopic device (2 a). The device is characterized in that a distance measuring device (4 a) is further arranged at the upper end of the telescopic device (2 a) on the fixed rack (1 a), the distance measuring device (4 a) is mounted on the fixed rack (1 a) and is close to the upper end plane of the telescopic device (2 a), the distance measuring device (4 a) is further provided with a synchronous rotating wheel (4 a 1), the synchronous rotating wheel (4 a 1) is in contact with the upper end plane of the telescopic device (2 a), the synchronous rotating wheel (4 a 1) is a cylindrical roller wheel, the cylindrical surface of the synchronous rotating wheel can be in contact and match with the upper end plane of the telescopic device (2 a), and when the telescopic device (2 a) stretches, the synchronous rotating wheel (4 a 1) follows the sliding of the upper end plane of the telescopic device (2 a) to generate rolling motion, thereby accurately controlling the telescopic distance of the telescopic device (2 a) according to the rotation angle of the synchronous rotating wheel (4 a 1). The telescopic device (2 a) anterior segment still is equipped with sealed head (2 a 1), range unit (4 a) are located sealed head (2 a 1) rear end, sealed head (2 a 1) lower extreme and hydraulic means (3 a) be assembled between/be connected, sealed head (2 a 1) can follow telescopic device (2 a) synchronous concertina movement. Still be equipped with water pressure telescopic link (3 a 1) in water pressure device (3 a), water pressure telescopic link (3 a 1) can extend or retract, has guaranteed that sealing head (2 a 1) follows for hydraulic system provides stable water pressure when telescoping device (2 a) concertina movement.

Fig. 3 is a schematic diagram of the working state of the first embodiment of the invention.

According to an aspect of the first embodiment of the present invention, as shown in fig. 3, the distance measuring device (4 a) further comprises a pressurizing device (4 a 2), the pressurizing device (4 a 2) further comprises a sliding rod (4 a2 a), a pressure spring (4 a2 b) and a mounting seat (4 a2 c), the mounting seat (4 a2 c) is provided with a sliding hole (4 a2c 1), a hole center line of the sliding hole (4 a2c 1) is perpendicular to a moving direction of the telescopic device (2 a), so that a telescopic moving direction of the sliding rod (4 a2 a) is also perpendicular to the moving direction of the telescopic device (2 a), and the perpendicular arrangement reduces a measurement error caused by up-and-down floating of the telescopic device (2 a) when the synchronous rotating wheel (4 a 1) and the telescopic device (2 a) move synchronously. The sliding rod (4 a2 a) is an elongated smooth round rod, the sliding hole (4 a2c 1) is an elongated smooth round hole, and the sliding rod (4 a2 a) is installed in the sliding hole (4 a2c 1) and can freely stretch and retract in the sliding hole. The technical scheme can be directly replaced by a similar technical scheme according to the technical means which is customary for a person skilled in the art, for example, the sliding rod (4 a2 a) can also be an elongated square smooth rod, the sliding hole (4 a2c 1) is an elongated square smooth hole, and the sliding rod (4 a2 a) is installed in the sliding hole (4 a2c 1) and can freely stretch and retract in the sliding hole. The lower end of the slide bar (4 a2 a) is provided with a fork, and the synchronous rotating wheel (4 a 1) is arranged at the lower end of the slide bar (4 a2 a) through the fork. The pressure spring (4 a2 b) is sleeved on the sliding rod (4 a2 a) and supported between the mounting seat (4 a2 c) and the synchronous rotating wheel (4 a 1). The pressurizing device (4 a 2) is arranged at the upper end part of the synchronous rotating wheel (4 a 1) and continuously applies pressure to the synchronous rotating wheel (4 a 1) to ensure that the synchronous rotating wheel (4 a 1) is always attached to the telescopic device (2 a) and ensure that the synchronous rotating wheel (4 a 1) always moves synchronously relative to the telescopic device (2 a).

According to one aspect of the first embodiment of the present invention, an electronic counting device (4 a 3) is further disposed in the distance measuring device (4 a), and the electronic counting device (4 a 3) and the synchronizing wheel (4 a 1) are connected to each other to rotate synchronously with the synchronizing wheel (4 a 1). When the synchronous rotating wheel (4 a 1) is in contact fit with the telescopic device (2 a), the telescopic device (2 a) extends out or retracts to drive the synchronous rotating wheel (4 a 1) to synchronously rotate, and the electronic counting device (4 a 3) can record and calculate the rotation angle of the synchronous rotating wheel (4 a 1), so that the telescopic distance of the telescopic device (2 a) can be obtained through a computer. When the telescopic device (2 a) extends to a proper length, namely a sealing head (2 a 1) at the front end of the telescopic device (2 a) extends to the position of the tubular material (5) and is matched with the tubular material (5) to close the hydraulic device (3 a) and the tubular material (5) to be in a sealing state, the electronic counting device (4 a 3) obtains the position information of the telescopic device (2 a) and transmits the position information to the computer, and the computer sends an instruction to enable the telescopic device (2 a) to stop extending. On the contrary, after the sealing test is finished, the telescopic device (2 a) retracts, namely the telescopic device (2 a) drives the sealing head (2 a 1) at the front end to move away from the tubular material (5), after the sealing head (2 a 1) is successfully separated from the tubular material (5), the electronic counting device (4 a 3) obtains the position information of the telescopic device (2 a) and transmits the position information to the computer, the computer sends an instruction to stop retracting the telescopic device (2 a), and the telescopic device (2 a) finishes working.

Fig. 4 is a schematic diagram of the working state of the second embodiment of the invention.

According to fig. 4, an aspect of the second embodiment of the present invention is different from the first embodiment in that the lower end of the sliding rod (4 a2 a) is not provided with a fork, the lower end of the sliding rod (4 a2 a) is provided with a contact head, the synchronizing wheel (4 a 1) is disposed in a floating frame, one end of the floating frame is provided with a circular hole, the lower end of the mounting seat (4 a2 c) is provided with a supporting hole, the circular hole at the end of the floating frame is connected with the supporting hole through a rotating shaft, and the floating frame can perform a swinging motion around the supporting hole. The synchronous rotating wheel (4 a 1) is arranged in the floating frame and is pressed downwards to the surface of the telescopic device (2 a), so that the synchronous rotating wheel (4 a 1) can be contacted with the surface of the telescopic device (2 a), the contact head at the lower end part of the sliding rod (4 a2 a) is pressed downwards at the upper end of the floating frame, and the pressure spring (4 a2 b) is sleeved on the sliding rod (4 a2 a) and is supported between the mounting seat (4 a2 c) and the floating frame. The pressurizing device (4 a 2) is arranged at the upper end part of the synchronous rotating wheel (4 a 1) and continuously applies pressure to the synchronous rotating wheel (4 a 1) to ensure that the synchronous rotating wheel (4 a 1) is always attached to the telescopic device (2 a) and ensure that the synchronous rotating wheel (4 a 1) always moves synchronously relative to the telescopic device (2 a).

According to one aspect of the second embodiment of the invention, an electronic counting device (4 a 3) is also provided in the distance measuring device (4 a), the electronic counting device (4 a 3) and the synchronizing wheel (4 a 1) being interconnected for synchronous rotation with the synchronizing wheel (4 a 1). The electronic counting device (4 a 3) can record and calculate the rotation angle of the synchronous wheel (4 a 1) so as to obtain the telescopic distance of the telescopic device (2 a) through a computer. When the telescopic device (2 a) extends to a proper length, namely a sealing head (2 a 1) at the front end of the telescopic device (2 a) extends to the position of the tubular material (5) and is matched with the tubular material (5) to close the hydraulic device (3 a) and the tubular material (5) to be in a sealing state, the electronic counting device (4 a 3) obtains the position information of the telescopic device (2 a) and transmits the position information to the computer, and the computer sends an instruction to enable the telescopic device (2 a) to stop extending. On the contrary, after the sealing test is finished, the telescopic device (2 a) retracts, namely the telescopic device (2 a) drives the sealing head (2 a 1) at the front end to move away from the tubular material (5), after the sealing head (2 a 1) is successfully separated from the tubular material (5), the electronic counting device (4 a 3) obtains the position information of the telescopic device (2 a) and transmits the position information to the computer, the computer sends an instruction to stop retracting the telescopic device (2 a), and the telescopic device (2 a) finishes working.

Fig. 5 is a schematic diagram of the working state of the third embodiment of the invention.

According to an aspect of the third embodiment of the present invention, as shown in fig. 5, the synchronous pulley (4 a 1) is disposed in a floating frame, one end of the floating frame is provided with a circular hole, the lower end of the mounting seat (4 a2 c) is provided with a supporting hole, the circular hole at the end of the floating frame is connected with the supporting hole through a rotating shaft, and the floating frame can perform a swinging motion around the supporting hole. The synchronous rotating wheel (4 a 1) is arranged in the floating frame and presses down to the surface of the telescopic device (2 a), so that the synchronous rotating wheel (4 a 1) can be contacted with the surface of the telescopic device (2 a), and the difference technical characteristic of the difference of the second embodiment is that the pressurizing device (4 a 2) is a pressure spring (4 a2 b), the pressure spring (4 a2 b) is a spring piece capable of providing continuous pressure downwards, one end of the pressure spring (4 a2 b) is fixed on a mounting seat (4 a2 c), the other end of the pressure spring presses down at the upper end of the floating frame, and pressure is continuously applied to the synchronous rotating wheel (4 a 1) to ensure that the synchronous rotating wheel (4 a 1) is always attached to the telescopic device (2 a), and ensure that the synchronous rotating wheel (4 a 1) always moves synchronously relative to the telescopic device (2 a).

According to an aspect of the third embodiment of the invention, an electronic counting device (4 a 3) is also provided in the distance measuring device (4 a), the electronic counting device (4 a 3) and the synchronizing wheel (4 a 1) being interconnected for synchronous rotation with the synchronizing wheel (4 a 1). The electronic counting device (4 a 3) can record and calculate the rotation angle of the synchronous wheel (4 a 1) so as to obtain the telescopic distance of the telescopic device (2 a) through a computer. When the telescopic device (2 a) extends to a proper length, namely a sealing head (2 a 1) at the front end of the telescopic device (2 a) extends to the position of the tubular material (5) and is matched with the tubular material (5) to close the hydraulic device (3 a) and the tubular material (5) to be in a sealing state, the electronic counting device (4 a 3) obtains the position information of the telescopic device (2 a) and transmits the position information to the computer, and the computer sends an instruction to enable the telescopic device (2 a) to stop extending. On the contrary, after the sealing test is finished, the telescopic device (2 a) retracts, namely the telescopic device (2 a) drives the sealing head (2 a 1) at the front end to move away from the tubular material (5), after the sealing head (2 a 1) is successfully separated from the tubular material (5), the electronic counting device (4 a 3) obtains the position information of the telescopic device (2 a) and transmits the position information to the computer, the computer sends an instruction to stop retracting the telescopic device (2 a), and the telescopic device (2 a) finishes working.

Fig. 6 is a schematic diagram of the working state of the fourth embodiment of the invention.

According to an aspect of the fourth embodiment of the present invention, as shown in fig. 6, a parallelogram linkage is provided between the synchronizing wheel (4 a 1) and the mounting seat (4 a2 c), and the pressure springs (4 a2 b) are provided at two opposite hinge points of the parallelogram linkage, so that the parallelogram linkage can be pulled to realize linkage movement, the synchronizing wheel (4 a 1) can be pressed down to the telescopic device (2 a), and pressure is continuously applied to the synchronizing wheel (4 a 1) to ensure that the synchronizing wheel (4 a 1) is always attached to the telescopic device (2 a), and the synchronizing wheel (4 a 1) is always in synchronous movement relative to the telescopic device (2 a).

Fig. 7 is a schematic diagram of the working state of the fifth embodiment of the invention.

Fig. 8 is a schematic view of a fifth embodiment of the present invention in an upward floating state.

Fig. 9 is a schematic view of a fifth embodiment of the present invention in a downward floating state.

According to an aspect of the fifth embodiment of the present invention, as shown in fig. 7, 8 and 9, the synchronizing wheel (4 a 1) is disposed on a floating frame, and the synchronizing wheel (4 a 1) can be disposed in a plurality, a plurality of synchronizing wheels (4 a 1) are attached to the telescoping device (2 a) and can form an elastic force between each other to be attached to the telescoping device (2 a), the floating frame continuously applies pressure to the synchronizing wheel (4 a 1) to ensure that the synchronizing wheel (4 a 1) is always attached to the telescoping device (2 a), and ensure that the synchronizing wheel (4 a 1) always moves synchronously relative to the telescoping device (2 a).

According to an aspect of the fourth and fifth embodiments of the invention, an electronic counting device (4 a 3) is also provided in the distance measuring device (4 a), the electronic counting device (4 a 3) being interconnected with the synchronizing wheel (4 a 1) so as to be rotatable in synchronism with the synchronizing wheel (4 a 1). The electronic counting device (4 a 3) can record and calculate the rotation angle of the synchronous wheel (4 a 1) so as to obtain the telescopic distance of the telescopic device (2 a) through a computer. When the telescopic device (2 a) extends to a proper length, namely a sealing head (2 a 1) at the front end of the telescopic device (2 a) extends to the position of the tubular material (5) and is matched with the tubular material (5) to close the hydraulic device (3 a) and the tubular material (5) to be in a sealing state, the electronic counting device (4 a 3) obtains the position information of the telescopic device (2 a) and transmits the position information to the computer, and the computer sends an instruction to enable the telescopic device (2 a) to stop extending. On the contrary, after the sealing test is finished, the telescopic device (2 a) retracts, namely the telescopic device (2 a) drives the sealing head (2 a 1) at the front end to move away from the tubular material (5), after the sealing head (2 a 1) is successfully separated from the tubular material (5), the electronic counting device (4 a 3) obtains the position information of the telescopic device (2 a) and transmits the position information to the computer, the computer sends an instruction to stop retracting the telescopic device (2 a), and the telescopic device (2 a) finishes working.

It should be understood that the description herein of specific embodiments of the invention is exemplary and should not be construed as unduly limiting the scope of the invention. The scope of the invention is defined by the claims appended hereto, and encompasses all embodiments and obvious equivalents thereof that fall within their scope.