A bellows compensator internal pressure high temperature fatigue performance testing machine

Abstract

The present invention discloses a bellows compensator internal pressure high-temperature fatigue performance testing machine, comprising an upper cover plate and a lower cover plate connected by a plurality of columns, a fatigue testing device arranged between the upper cover plate and the lower cover plate, and a temperature control device arranged outside the fatigue testing device; the fatigue testing device comprises two fixed chucks arranged opposite to each other, the two fixed chucks being respectively connected to one end of two tested bellows, the other ends of the two tested bellows being connected to a push plate of a push-pull device, and the two fixed chucks being fixedly connected via a connecting rod; the lower fixed chuck being connected to the free end of the lower platform lifting and fixing device; the push-pull device cooperating with the main oil cylinder fixed on the upper cover plate; and also comprising a pressure testing system for providing medium pressure to the inside of the tested bellows. The present invention has a simple structure, is easy to install, and has a wide range of applications, effectively solving the problem of the lack of dedicated equipment for performing corresponding high-temperature tests in the prior art.

Description

Technical Field

[0001] The present invention belongs to the technical field of detection devices, and in particular relates to a bellows compensator internal pressure high temperature fatigue performance detection testing machine. Background Art

[0002] According to the latest "General Technical Requirements for Metal Bellows Expansion Joints," fatigue testing of bellows designed for temperatures within the material's creep temperature range must be performed on dedicated high-temperature fatigue testing equipment. However, currently, there are no dedicated internal pressure, high-temperature fatigue performance testing machines in China, requiring testing to be performed on conventional equipment. This results in inaccurate results, impacting the use and design of metal bellows. Therefore, a bellows compensator internal pressure, high-temperature fatigue performance testing machine is needed to address this issue. Summary of the Invention

[0003] The purpose of the present invention is to provide a bellows compensator internal pressure high temperature fatigue performance testing machine to solve the problems in the prior art.

[0004] To achieve the above-mentioned object, the technical solution of the present invention is as follows: a bellows compensator internal pressure high-temperature fatigue performance testing machine, characterized in that: it includes an upper cover plate and a lower cover plate connected by a plurality of columns, a fatigue testing device is provided between the upper cover plate and the lower cover plate, and a temperature control device is provided on the outside of the fatigue testing device; the fatigue testing device includes two fixed chucks arranged opposite to each other, the two fixed chucks are respectively connected to one end of two tested bellows, the other ends of the two tested bellows are connected to the push plate of the push-pull device, and the two fixed chucks are fixedly connected by a connecting rod; the lower fixed chuck is connected to the free end of the lower platform lifting and fixing device; the push-pull device cooperates with the main oil cylinder fixed on the upper cover plate;

[0005] The temperature control device includes a heat preservation cover, inside which a heating device and a temperature sensor are arranged; and also includes a pressure testing system that provides medium pressure to the inside of the tested bellows, and the pressure testing system is connected to the inside of the bellows.

[0006] Furthermore: the heat-insulating cover is a two-petal structure, which is connected by a lock fit, and a bracket is provided on each petal of the heat-insulating cover, and the bracket is slidably fitted with the guide rail on the lower cover.

[0007] Furthermore: the fixed chuck is provided with radial T-slots, and multiple T-slots are arranged in a "M" shape. Clamps are slidably connected in the T-slots, and the clamps are driven by a servo motor with a screw.

[0008] Furthermore: it also includes a pump station with a hydraulic valve, and the pump station is connected to the main oil cylinder and the lower platform lifting and fixing device through oil pipes.

[0009] Furthermore: a fan is also provided inside the heat-insulating cover.

[0010] Furthermore: a displacement sensor is provided on the push-pull device.

[0011] The beneficial effects of the structure of the present invention are: the structure of the present invention is simple, the installation is convenient, and the application range is wide. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0013] Description of reference numerals:

[0014] 1 is the main oil cylinder, 2 is the push-pull device, 3 is the bellows, 4 is the heating device, 6 is the heat insulation cover, 7 is the temperature sensor, 8 is the lower platform lifting and fixing device, 9 is the upper cover, 10 is the column, 11 is the pressure testing system, 12 is the lower cover, 13 is the fan, 14 is the bracket, 15 is the displacement sensor, 16 is the hydraulic valve, 17 is the pump station, 18 is the fixed clamping plate, and 19 is the guide rail.

[0015] The present invention will be further described in detail below through examples in conjunction with the accompanying drawings. However, the following examples are merely examples of the present invention and do not represent the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims. DETAILED DESCRIPTION

[0016] like Figure 1 As shown, the present invention discloses a bellows compensator internal pressure high temperature fatigue performance testing machine, which is characterized in that: it includes an upper cover plate 9 and a lower cover plate 12 connected by multiple columns 10, the lower cover plate is fixed on the frame or the ground, a fatigue testing device is provided between the upper cover plate 9 and the lower cover plate 12, and a temperature control device is provided on the outside of the fatigue testing device; the fatigue testing device includes two fixed chucks 18 arranged opposite to each other, the two fixed chucks 18 are respectively connected to one end of the two tested bellows 3, and the other ends of the two tested bellows 3 are connected to the push plate of the push-pull device 2, the push plate is flange-shaped, and has a hole in the middle to facilitate the smooth hydraulic pressure inside the two bellows, and the two fixed The chucks 18 are fixedly connected by a connecting rod; the lower fixed chuck 18 is connected to the free end of the lower platform lifting and fixing device 8, and the lower platform lifting and fixing device 8 is fixed on the bench or on the ground; the push-pull device 2 cooperates with the main oil cylinder 1 fixed on the upper cover plate 9, and the push plate on the push-pull device is driven up and down by the extension and contraction of the main oil cylinder; the temperature control device is used to control the temperature of the fatigue testing device to achieve performance testing under high temperature conditions, which includes an insulation cover 6, and a heating device 4 and a temperature sensor 7 are arranged inside the insulation cover; it also includes a pressure testing system 11 that provides medium pressure to the inside of the bellows to be tested, and the pressure testing system is connected to the inside of the bellows.

[0017] Preferably, the heat-insulating cover 6 is a two-petal structure connected by a lock fit, and a bracket is provided on each petal of the heat-insulating cover 6. The bracket is slidably fitted with the guide rail on the lower cover, and the bracket is fixedly connected or hingedly connected to the heat-insulating cover.

[0018] Preferably, the fixed chuck 18 is provided with radial T-slots, and a plurality of T-slots are arranged in a "M" shape, and a clamping claw is slidably connected in the T-slot, and the clamping claw is driven by a servo motor with a screw to clamp the end of the bellows or the fatigue testing device.

[0019] Preferably, a pump station 17 with a hydraulic valve 16 is further included, and the pump station 17 is respectively connected to the main oil cylinder 1 and the lower platform lifting and fixing device 8 through oil pipes.

[0020] Preferably, a fan 13 is provided inside the heat-insulating cover 6 to maintain a uniform temperature inside the heat-insulating cover and to cool the cover when necessary.

[0021] Preferably, a displacement sensor 15 is provided on the push-pull device.

[0022] The working process of the structure of the present invention is as follows: first, install a pressure blind plate on one end of the two bellows test pieces, and then install the other ends on both sides of the push plate of the push-pull device 2, so that the two bellows form an internally connected closed structure, and finally put the whole into the lower platform lifting and fixing device 8, and clamp it through the chuck, then connect the push-pull device 2 with the main oil cylinder 1, and the push-pull device 2 transmits the power of the main oil cylinder 1 to the push plate, so that the push plate moves up and down, driving the two bellows to alternately compress or stretch, and adjust the state of the bellows by fatigue reciprocating without load. Finally, move the bracket 14 to the bellows, and move the bracket back and forth on the guide rail 19 (that is, perpendicular to the paper inward or outward direction in the figure), close the heat-insulating and pressure-resistant shell 6 to form a sealed situation, start the temperature control system, control the operation of the heater and the fan, heat the heat-insulating and pressure-resistant shell 6 to the required temperature, start the pressure testing system 11, and pass gas or liquid through the bellows to the required test pressure. When the push plate operation, temperature control system and pressure testing system meet the requirements, start timing or use a counter to count the number of fatigue times until the test ends.

Claims

1. A bellows compensator internal pressure high temperature fatigue performance testing machine, characterized by: It comprises an upper cover plate (9) and a lower cover plate (12) connected by a plurality of columns (10), a fatigue testing device is provided between the upper cover plate (9) and the lower cover plate (12), and a temperature control device is provided outside the fatigue testing device; The fatigue testing device comprises two fixed chucks (18) arranged opposite to each other, the two fixed chucks (18) being connected to one end of two tested bellows (3) respectively, the other ends of the two tested bellows (3) being connected to the push plate of the push-pull device (2), and the two fixed chucks (18) being fixedly connected via a connecting rod; The lower fixing chuck (18) is connected to the free end of the lower platform lifting fixture (8); the push-pull device (2) cooperates with the main oil cylinder (1) fixed on the upper cover (9); The temperature control device comprises a heat-insulating cover (6), inside which a heating device (4) and a temperature sensor (7) are arranged; It also includes a pressure testing system (11) for providing medium pressure to the interior of the tested bellows, wherein the pressure testing system is in communication with the interior of the bellows.

2. The bellows compensator internal pressure high temperature fatigue performance testing machine according to claim 1, characterized in that: The heat-insulating cover (6) is a two-flap structure connected by a lock fit, and a bracket is provided on each flap of the heat-insulating cover (6), and the bracket is slidably fitted with a guide rail on the lower cover.

3. The bellows compensator internal pressure high temperature fatigue performance testing machine according to claim 1, characterized in that: The fixed chuck (18) is provided with radial T-slots, and the plurality of T-slots are arranged in a "M" shape. A clamping claw is slidably connected in the T-slot, and the clamping claw is driven by a servo motor with a lead screw.

4. The bellows compensator internal pressure high temperature fatigue performance testing machine according to claim 1, characterized in that: It also includes a pump station (17) with a hydraulic valve (16), and the pump station (17) is respectively connected to the main oil cylinder (1) and the lower platform lifting and fixing device (8) through oil pipes.

5. The bellows compensator internal pressure high temperature fatigue performance testing machine according to claim 1, characterized in that: A fan (13) is also provided inside the heat-insulating cover (6).

6. The bellows compensator internal pressure high temperature fatigue performance testing machine according to claim 1, characterized in that: A displacement sensor (15) is provided on the push-pull device.

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