Testing device for pulling-out force of rubber-coated piston

Abstract

The utility model discloses a rubber-coated piston pulling force testing device, which comprises a working cylinder (1) internally provided with a cylindrical working cavity (10); the to-be-tested rubber-coated piston (2) is hermetically mounted in the working cavity (10) and divides the working cavity (10) into a first accommodating cavity (101) and a second accommodating cavity (102); the device is characterized by further comprising a sealing plug (4) which is installed in the second containing cavity (102) in a sealed mode, and an oil storage cavity (100) for containing test oil is defined by the sealing plug (4), the rubber-coated piston (2) to be tested and the inner circumferential wall of the working cavity (10); and the driving piece is used for driving the sealing plug (4) to move in the axial direction of the working cylinder (1). Compared with the prior art, the rubber-coated piston pulling force testing device can meet the requirement that the rubber-coated piston is in contact with specific oil and is low in cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to test equipment technical field, concretely refers to a kind of rubber-coated piston pull-out force testing device. BACKGROUND

[0002] In the suspension system, the elastic element is impacted to produce vibration, in order to improve the smoothness and comfort of the vehicle driving, the shock absorber is installed in parallel with the elastic element in the suspension. When the relative movement occurs between the frame and the axle, the piston in the shock absorber moves up and down. Due to the frequent relative movement of the piston and the shock absorber cylinder, the surface of the piston needs to be coated with a material that is wear-resistant and has low frictional resistance, such as polytetrafluoroethylene, to prolong the service life.

[0003] After the completion of the coating of the piston, the piston needs to be tested for rubber-coated anti-dropping to determine whether the product meets the design requirements (load capacity, friction resistance, sealing effect) and whether it is qualified (the greater the pull-out force obtained by testing, the more difficult the rubber coating is to fall off, i.e., the better the performance of the rubber-coated piston). Currently, there is an urgent need for a device that can accurately test the pull-out force of the rubber-coated piston, is easy to manufacture and has low cost.

[0004] Patent No. CN201520820032.6 discloses a rubber-coated piston pull-out force testing device, which includes a working cylinder, a piston rod, a lateral force loading device and an oil cylinder. The working cylinder forms a cylindrical working chamber inside. One end of the piston rod is provided with a rubber-coated piston to be tested and is inserted into the working chamber from the top opening of the working chamber. The inner diameter of the working chamber is adapted to the piston. The lateral force loading device is arranged on the part of the piston rod outside the working chamber. The bottom surface of the piston is sealed. The outer wall of the working cylinder is provided with a heating ring. The oil cylinder includes an oil inlet pipe, an oil return pipe and an oil pressure gauge. The oil inlet pipe is in communication with the bottom of the working chamber. The oil return pipe is in communication with the upper part of the working chamber.

[0005] In the above-mentioned scheme, the working chamber is in communication with the oil cylinder. Therefore, the test oil in contact with the rubber-coated piston in the working chamber is consistent with the hydraulic oil in the oil cylinder. However, in actual testing, some customers have specific requirements for the type of test oil, such as specific shock absorber oil. In this case, the hydraulic oil in the oil cylinder can only be replaced synchronously, which is more troublesome and costly. UTILITY MODEL CONTENTS

[0006] The utility model solves the technical problem, provides a rubber-coated piston pull-out force testing device which can meet the demand of contacting specific oil and has low cost.

[0007] The utility model solves the above-mentioned technical problem by adopting the following technical scheme: a rubber-coated piston pull-out force testing device, which comprises

[0008] a working cylinder having a working chamber in the interior thereof in the form of a cylinder; and

[0009] a piston to be tested, which is sealingly mounted in the working chamber and divides the working chamber into a first chamber and a second chamber;

[0010] characterized in that it further comprises

[0011] a sealing plug, which is sealingly mounted in the second chamber and, together with the piston to be tested and the inner wall of the working chamber, forms an oil storage chamber for storing test oil; and

[0012] a drive element for driving the sealing plug to move along the axial direction of the working cylinder.

[0013] In order to facilitate the longitudinal pressure of the test oil in the oil storage chamber on the rubberized part, the peripheral part of the piston to be tested has a rubberized part, one end of which has a flared opening, which is directed towards the second chamber.

[0014] In order to prevent the piston to be tested from moving, a piston rod is further provided, one end of which is connected to the piston to be tested, and the other end of which is exposed outside the working cylinder.

[0015] In order to achieve stable driving of the sealing plug, the drive element is an oil cylinder, which has a power output rod that can move along the axial direction of the working chamber, and the end of the power output rod extends into the working chamber and is connected to the sealing plug.

[0016] In order to prevent oil leakage, the side of the working cylinder is provided with an oil leakage and return hole that communicates with the first chamber.

[0017] In order to form the working chamber, the working cylinder comprises a hollow cylinder body, a base mounted at the bottom of the cylinder body, and a top cover mounted at the top of the cylinder body, and the working chamber is formed between the cylinder body, the base and the top cover.

[0018] In order to facilitate the relative fixation of the working cylinder and the drive element, a machine base is further provided, and the working cylinder and the drive element are both mounted on the machine base.

[0019] In order to simplify the structure of the machine base, the machine base is a horizontally arranged support plate, and the working cylinder and the drive element are respectively located on both sides of the support plate.

[0020] Compared with the prior art, the rubber-coated piston pull-out force testing device has the advantages that the sealing plug is sealingly installed in the second cavity to form an oil storage cavity for storing test oil between the sealing plug and the inner peripheral wall of the working cavity of the rubber-coated piston to be tested, and the sealing plug is driven to move along the axial direction of the working cylinder by the driving member, so that the test oil is arranged in an independent cavity, the requirement of the rubber-coated piston to contact specific oil is met, and the cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a perspective view of an embodiment of the rubber-coated piston pull-out force testing device of the utility model;

[0022] Figure 2 is Figure 1 a longitudinal sectional view. DETAILED DESCRIPTION

[0023] The utility model will be further described in detail below in combination with the embodiment of the drawings.

[0024] In the specification and claims of the utility model, terms indicating directions, such as 'front', 'back', 'upper', 'lower', 'left', 'right','side', 'top', 'bottom' and the like, are used to describe various example structural parts and elements of the utility model, but these terms are only used for the purpose of convenient description and are determined based on the example orientation shown in the drawings. Since the disclosed embodiments of the utility model can be arranged in different directions, these terms indicating directions are only used for description and should not be regarded as limitation, for example, 'upper' and 'lower' are not necessarily limited to the direction opposite or consistent with the direction of gravity.

[0025] As Figures 1 to 2 shown, it is a preferred embodiment of the rubber-coated piston pull-out force testing device of the utility model. The rubber-coated piston pull-out force testing device comprises a base, a working cylinder 1, a rubber-coated piston to be tested 2, a piston rod 3, a sealing plug 4 and a driving member.

[0026] Among them, the base is a horizontally arranged support plate 6.

[0027] The working cylinder 1 is installed on the top of the support plate 6 and comprises a hollow cylinder body 11, a base 12 installed at the bottom of the cylinder body 11 and a top cover 13 installed at the top of the cylinder body 11, and a working cavity 10 in the shape of a cylinder is formed between the cylinder body 11, the base 12 and the top cover 13.

[0028] The to-be-tested rubber-coated piston 2 is sealingly installed in the working chamber 10 and divides the working chamber 10 into an upper first cavity 101 and a lower second cavity 102, and the side of the cylinder body 11 is provided with an oil leakage and return hole 111 communicating with the first cavity 101; the to-be-tested rubber-coated piston 2 has a rubber-coated portion 21, and the bottom end of the rubber-coated portion 21 is provided with a flared opening 211 facing the second cavity 102.

[0029] The piston rod 3 is vertically arranged, the bottom end of the piston rod 3 is connected to the top of the to-be-tested rubber-coated piston 2, and the top end of the piston rod 3 is exposed outside the working cylinder 1.

[0030] The sealing plug 4 is sealingly installed in the second cavity 102 and is surrounded by the to-be-tested rubber-coated piston 2 and the inner wall of the working chamber 10 to form an oil storage cavity 100 for containing test oil.

[0031] The driving member is an oil cylinder 5 installed at the bottom of the support plate 6, the oil cylinder 5 has a vertically arranged power output rod 51 capable of moving along the axial direction of the working chamber 10, the top end of the power output rod 51 extends into the working chamber 10 and is connected to the bottom of the sealing plug 4, for driving the sealing plug 4 to move along the axial direction of the working cylinder 1.

[0032] The working principle of the embodiment is as follows: during testing,

[0033] (1) start the oil cylinder 5, drive the sealing plug 4 to rise by the power output rod 51, since the oil storage cavity 100 contains test oil, the test oil will drive the flared opening 211 of the rubber-coated portion 21 to gradually open to achieve sealing, and drive the to-be-tested rubber-coated piston 2 to synchronously move upward until the top end of the piston rod 3 abuts against the external positioning device;

[0034] (2) the oil cylinder 5 continues to drive the sealing plug 4 to rise by the power output rod 51, the longitudinal pressure of the test oil in the oil storage cavity 100 applied on the rubber-coated portion 21 gradually increases, the pressure is the pull-out force applied on the to-be-tested rubber-coated piston 2, the pressure in the oil cylinder 5 is detected by the oil pressure gauge installed on the oil cylinder 5 to convert the pressure of the test oil in the oil storage cavity 100, until the required pressure is reached and the pressure is maintained for three minutes, during which, the piston rod 3 is subjected to horizontal lateral force by the external lateral force loading device to cause the rubber-coated portion 21 of the to-be-tested rubber-coated piston 2 to produce slight deformation (only longitudinal force cannot test the pull-out force);

[0035] (3) after the test is completed, the to-be-tested rubber-coated piston 2 is taken out to observe the appearance to see whether the rubber-coated portion 21 falls off, thereby measuring the pull-out force level of the to-be-tested rubber-coated piston 2 (for example, if the rubber-coated portion 21 does not fall off, the pull-out force reaches the standard, and if the rubber-coated portion 21 falls off, the pull-out force does not reach the standard), and further judging the performance of the to-be-tested rubber-coated piston 2.

Claims

1. A device for testing the pull-out force of a rubber-coated piston, comprising: The working cylinder (1) has a cylindrical working cavity (10) inside; and The rubber-coated piston (2) to be tested is sealed and installed in the working chamber (10), and the working chamber (10) is divided into a first cavity (101) and a second cavity (102); Its features are: It also includes A sealing plug (4) is installed in the second cavity (102) and surrounds the inner peripheral wall of the rubber-coated piston (2) to be tested and the working cavity (10) to form an oil reservoir (100) for accommodating the test oil; and A drive unit is used to drive the sealing plug (4) to move axially along the working cylinder (1).

2. The rubber-coated piston pull-out force testing device according to claim 1, characterized in that: The periphery of the rubber-coated piston (2) to be tested has a rubber-coated part (21), one end of which has a flared opening (211) facing the second cavity (102).

3. The rubber-coated piston pull-out force testing device according to claim 1, characterized in that: It also includes a piston rod (3), the first end of which is connected to the rubber-coated piston (2) to be tested, and the second end of which is exposed outside the working cylinder (1).

4. The rubber-coated piston pull-out force testing device according to claim 1, characterized in that: The driving component is a hydraulic cylinder (5), which has a power output rod (51) that can move axially along the working chamber (10). The end of the power output rod (51) extends into the working chamber (10) and is connected to the sealing plug (4).

5. The rubber-coated piston pull-out force testing device according to claim 1, characterized in that: The working cylinder (1) has an oil leakage and return hole (111) on its side that communicates with the first cavity (101).

6. The device for testing the pull-out force of the rubber-coated piston according to claim 1, characterized in that: The working cylinder (1) includes a hollow cylinder body (11), a base (12) installed at the bottom of the cylinder body (11), and a top cover (13) installed at the top of the cylinder body (11). The working cavity (10) is formed between the cylinder body (11), the base (12), and the top cover (13).

7. The rubber-coated piston pull-out force testing device according to any one of claims 1 to 6, characterized in that: It also includes a base on which the working cylinder (1) and the drive unit are mounted.

8. The rubber-coated piston pull-out force testing device according to claim 7, characterized in that: The base is a horizontally arranged support plate (6), and the working cylinder (1) and the driving component are located on both sides of the support plate (6).

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