Sealing performance detection device suitable for linear guide rail rubber sealing element

Abstract

The invention discloses a sealing performance detection device suitable for a linear guide rail rubber sealing element, relates to the technical field of sealing performance detection, optimizes a linear guide rail function test process, and is specifically characterized in that two to-be-detected workpieces are arranged on two sides of an action crankshaft, and a plurality of eccentric action positions are arranged on the action crankshaft; the device is mainly used for limiting the setting positions of a rotating point A and a connecting point B, so that one end of a pneumatic connecting rod performs eccentric rotation action through an action crankshaft, and application requirements of different stress directions can be simulated when a workpiece to be tested is maintained to slide horizontally. The method is mainly used for shortening test time consumption, and has the key content that a current value of a driving motor assembly is used as a basic reference condition, and an error ratio obtained by calculating a pressure value, a temperature value and a vibration frequency is used for performing complementary analysis; therefore, the state of the sealing performance is judged.

Description

Technical Field

[0001] The invention relates to the technical field of sealing performance detection, and in particular to a sealing performance detection device suitable for a rubber seal of a linear guide rail. Background Art

[0002] The seals in linear guides are usually made of rubber, nylon, polyurethane and other materials, which have good wear resistance and sealing performance. Rubber seals prevent dust and debris from entering the slider in linear guides, thereby protecting the normal operation of the guides.

[0003] Factors that affect the operation of linear guides include sealing resistance, friction resistance, etc. Taking sealing resistance as an example, the sealing performance of the seal is tested by a relevant functional test machine. The relevant content in the publication number CN117367786A can be referred to. Its essence is to perform multiple reciprocating motions and collect relevant motion data simultaneously, and analyze and judge the sealing performance based on the motion data. The overall process is time-consuming and the experimental function is relatively single. It should also be noted that: although the linear guide can only move along its length, its force direction is not limited to its length direction, which leads to differences in the degree of force during the actual operation of the linear guide. Conventional experimental functional machines are mainly based on reciprocating motion structures. This application proposes a solution to this problem. Summary of the invention

[0004] The purpose of the present invention is to provide a sealing performance testing device suitable for linear guide rubber seals. For the testing process of the sealing performance of linear guides, conventional experimental functional machines are mainly based on the reciprocating motion of the linear guides. The overall process is time-consuming, and because the motion form is relatively single, it cannot completely simulate the operating environment of the linear guide, and the experimental functionality is relatively single.

[0005] The object of the present invention can be achieved by the following technical scheme: a sealing performance detection device for a linear guide rubber seal comprises a body shell and a workpiece to be tested, wherein an action crankshaft and a drive motor assembly are arranged in the body shell, and both ends of the action crankshaft are mounted on the output end of the drive motor assembly; The workpiece to be measured is arranged at two end positions of the action crankshaft in a manner perpendicular to the length direction of the action crankshaft, a pneumatic connecting rod is arranged between the workpiece to be measured and the action crankshaft, and the two end positions of the pneumatic connecting rod are rotationally connected to the action crankshaft and the workpiece to be measured; The action crankshaft is provided with a plurality of eccentric action positions, the center points of the plurality of eccentric action positions are not on the same axis, and the center point of the eccentric action position and the center point position of the output end of the drive motor assembly are not on the same axis; An integrated detection module associated with multiple workpieces to be tested and a drive motor assembly is arranged on the body shell, and the integrated detection module includes a temperature sensor applied on the workpiece to be tested, a vibration frequency sensor, a current detector applied on the drive motor assembly, and a pressure sensor applied on the pneumatic connecting rod.

[0006] It is further configured as follows: the rotation point of the driving motor assembly and the action crankshaft is set to A, and the connection point between the eccentric action position in the action crankshaft and the position of one end of the pneumatic connecting rod is set to B.

[0007] It is further configured as follows: one of the workpieces to be measured arranged at both sides of the eccentric action position in the action crankshaft is set as a one-way portion, and the other workpiece to be measured arranged at both sides of the eccentric action position in the action crankshaft is set as a complementary portion, and the sliding directions of the workpieces to be measured in the one-way portion and the complementary portion are opposite. It is further configured as follows: the integrated detection module performs a complementary analysis action on the pressure value, current value, temperature value and vibration frequency in the complementary part and the unidirectional part, and sets the pressure value, current value, temperature value and vibration frequency as Ft, It, Tt and Qt respectively, and splits Ft, Tt and Qt into: Ft according to the unidirectional part and the complementary part. z and Ft. y , Tt z and Tt y and Qt z and Qt y , and set the constant current value Io in the drive motor assembly.

[0008] Further set to: Ft z and Ft. y , Tt z and Tt y , Qt z and Qt y The error ratios of Io and It are calculated and expressed as MF, MT, MQ and MI respectively, and the error ratios of Io and It are calculated according to Ft z and Ft. y , Tt z and Tt y , Qt z and Qt y As well as the specific values ​​of Io and It, limit MF, MT, MQ and MI to values ​​greater than 1.

[0009] Further setting is: the intermediate coefficient is set to 1.09 based on the error ratio of MI, and the following state analysis results are set according to the intermediate coefficient 1.09: State 1: When 1<MI<1.09, it means that the sealing performance of the workpiece to be tested is in a better state; State 2: When MI>1.09, it indicates that the sealing performance of the workpiece to be tested is in a defective state, and MF, MT, and MQ are synchronously marked to determine the detailed state of the workpiece to be tested.

[0010] The present invention has the following beneficial effects: 1. In the functional test process of the linear guide, the rotational motion of the action crankshaft is converted into the linear movement motion of the workpiece to be tested. Specifically, the pneumatic connecting rod is used as the connection structure between the workpiece to be tested and the action crankshaft. By setting a number of eccentric action positions on the action crankshaft, which is mainly used to limit the setting positions of the rotation point A and the connection point B, one end of the pneumatic connecting rod is subjected to an eccentric rotation motion through the action crankshaft, which can simulate the application requirements of different force directions, and further optimize the eccentric action positions on the action crankshaft. The workpiece to be tested is symmetrically set along the action crankshaft. A single complete rotation motion of the action crankshaft can promote the workpiece to be tested to perform two reciprocating motions, which is mainly used to shorten the test time. 2. Based on the above content, the overall experimental process is based on the current value in the drive motor assembly as the reference condition, and then combined with the pressure value, temperature value and vibration frequency to perform multiple error ratio analysis and calculation processes. Specifically, the error ratio of the current value is used as the basis, and combined with the error ratio of the pressure value, temperature value and vibration frequency for complementary analysis. On the basis of shortening the test cycle, detailed status analysis can be performed on the basis of determining and analyzing the sealing performance of the linear guide, and multiple groups of functional test processes can be performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 This is a schematic structural diagram of a sealing performance detection device for a linear guide rail rubber seal proposed by the present invention; Figure 2 The sealing performance detection device for the rubber seal of the linear guide proposed by the present invention is Figure 1 The local split diagram of ; Figure 3 It is a structural schematic diagram of an actuating crankshaft in a sealing performance detection device for a linear guide rail rubber seal proposed by the present invention; Figure 4 The sealing performance detection device for the rubber seal of the linear guide proposed by the present invention is Figure 3 A top view of Figure 5 It is a lateral schematic diagram of the corresponding rotation point A and connection point B in the action crankshaft in the sealing performance detection device for the linear guide rubber seal proposed by the present invention; Figure 6 This is a schematic structural diagram of a pneumatic connecting rod in a sealing performance detection device for a linear guide rail rubber seal proposed by the present invention.

[0013] In the figure: 1. body shell; 2. drive motor assembly; 3. action crankshaft; 301. eccentric action position; 4. pneumatic connecting rod; 5. workpiece to be measured. DETAILED DESCRIPTION

[0014] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] Embodiment 1: For the detection process of the seal performance in the linear guide, the conventional experimental function machine is mainly based on the reciprocating motion of the linear guide. The overall process is time-consuming, and because the motion form is relatively simple, it cannot fully simulate the operating environment of the linear guide. The experimental functionality is relatively simple. The following technical solutions are proposed: Reference Figures 1 to 6 The sealing performance detection device for the rubber seal of a linear guide in this embodiment includes a body shell 1 and a workpiece 5 to be tested. An action crankshaft 3 and a drive motor assembly 2 are arranged in the body shell 1. Both ends of the action crankshaft 3 are installed on the output end of the drive motor assembly 2. The workpiece 5 to be measured is arranged at both ends of the working crankshaft 3 in a manner perpendicular to the length direction of the working crankshaft 3. A pneumatic connecting rod 4 is arranged between the workpiece 5 to be measured and the working crankshaft 3. The two ends of the pneumatic connecting rod 4 are rotatably connected to the working crankshaft 3 and the workpiece 5 to be measured. A plurality of eccentric action positions 301 are arranged on the action crankshaft 3, and the center points of the plurality of eccentric action positions 301 are not on the same axis, and the center point of the eccentric action position 301 and the center point position of the output end of the drive motor assembly 2 are not on the same axis; An integrated detection module associated with multiple workpieces to be tested 5 and a drive motor assembly 2 is provided on the body shell 1. The integrated detection module includes a temperature sensor applied on the workpiece to be tested 5, a vibration frequency sensor, a current detector applied on the drive motor assembly 2, and a pressure sensor applied on the pneumatic connecting rod 4.

[0016] Basic principle: The operating principle of linear guides is to achieve low-friction, high-precision linear motion through rolling contact between the slider and the guide rail. Linear guides are mainly composed of guide rails and sliders. The guide rails are usually long strips, and the surface is precisely processed with high flatness and smoothness; the slider is installed on the guide rail, and contacts the guide rail surface through rolling elements (such as balls or rollers) to achieve low-friction linear motion. The main function of the seal in the linear guide is to prevent external impurities such as dust, oil and water vapor from entering the interior of the guide rail, thereby protecting machine parts from damage, extending the service life of the machine, and ensuring high-precision and efficient operation of the machine. On the basis of maintaining the sealing performance, the seal will also produce greater resistance to the sliding process between the slider and the guide rail. This part is the key factor affecting the operating stability of the linear guide. One of the elements, the present invention proposes relevant contents, specifically, actively forming a reciprocating motion mode of the linear guide rail, and performing relevant parameter detection on the linear guide rail in the reciprocating motion mode, specifically using a temperature sensor and a vibration frequency sensor to respectively detect the real-time temperature and vibration frequency during the operation of the linear guide rail, wherein the temperature parameter is used to feedback the friction resistance between the slider and the guide rail. When the slider and the guide rail undergo multiple reciprocating motions, friction heat is generated due to the friction resistance; and the vibration frequency is mainly used to feedback the stability of the slider and the guide rail when they undergo reciprocating motions. If there is an obvious gap between the surfaces of the slider and the guide rail, or if there is a defect in the seal between the two, it will cause an obvious vibration feeling between the slider and the guide rail, so that the two parameters of temperature and vibration frequency can be used to preliminarily judge the operation status of the linear guide rail; However, the present invention is mainly aimed at the sealing performance of the seal in the linear guide rail. When the sealing performance between the slider and the guide rail is improved, the friction resistance between the guide rail and the slider will also be increased. Therefore, the present invention is still based on the reciprocating motion between the slider and the guide rail. But the difference is: Figure 5 and Figure 3 Specifically, the pneumatic connecting rod 4 is used as the connection structure between the action crankshaft 3 and the workpiece 5 to be measured, and the guide rail in the workpiece 5 to be measured is installed at the corresponding position. The action crankshaft 3 is driven by the driving motor assembly 2 to rotate at a uniform speed. A plurality of action eccentric positions 301 are provided on the action crankshaft 3, and one end of the pneumatic connecting rod 4 is connected to the action eccentric position 301 on the action crankshaft 3 and maintains a rotation connection, so that it can be understood that the position of one end of the pneumatic connecting rod 4 rotates along the transmission shaft position of the driving motor assembly 2. Figure 5For example, the other end of the pneumatic connecting rod 4 pulls the slider in the workpiece 5 to be tested to reciprocate on the guide rail. For the reciprocating motion of the workpiece 5 to be tested in the present invention, the force direction of the slider is not limited to the horizontal direction, but the force angle of the pneumatic connecting rod 4 is further set by the eccentricity of the action eccentric position 301 relative to the action crankshaft 3 when rotating, so as to simulate the application requirements of different conditions, but the overall process can still drive the workpiece 5 to be tested to perform a small reciprocating motion; And further explain the pneumatic connecting rod 4: the essence of the pneumatic connecting rod 4 can refer to the oil cylinder structure. Figure 6 For example, two air nozzles are arranged at the lower side of the pneumatic connecting rod 4, and the pneumatic connecting rod 4 is composed of a sliding sleeve and a sliding rod, and air chambers corresponding to the two air nozzles are opened inside the sliding sleeve and the sliding rod. When the pneumatic connecting rod 4 is relatively displaced under the eccentric rotation of the action crankshaft 3, the gas in one of the air chambers is compressed, so that the pressure in the air chamber increases. It should be further explained that: if the friction resistance generated by the sealing component between the slider and the guide rail in the workpiece 5 to be tested is large, the degree of compression of the air chamber is further increased, so that the pressure in the air chamber is further increased, so that the sealing performance of the workpiece 5 to be tested can also be fed back according to the pressure change in the pneumatic connecting rod 4; In combination with the above content, it is further explained that: the overall action crankshaft 3 is provided with kinetic energy by the motor drive assembly 2, and under the preset condition of "optimal sealing performance, negligible or even no friction resistance of the seal to the slider and the guide rail", the rotation process of the action crankshaft 3 will not be subjected to resistance from the workpiece 5 to be measured, so it is further understood that: without considering motor aging, voltage instability, and heat dissipation effect, when the load changes, the current value fluctuates significantly, and combined with the relevant content in the present invention, it can be understood and explained that: when the friction resistance caused by the seal in the workpiece 5 to be measured is large, the load of the drive motor assembly 2 increases, thereby the current value in the drive motor assembly 2 changes significantly, and this is combined with the pressure change, temperature value and vibration frequency in the above-mentioned pneumatic linkage 4 to judge the sealing performance of the workpiece 5 to be measured.

[0017] Embodiment 2: Supplementary explanation is given for the installation position of the workpiece 5 to be tested in combination with the technical content in Embodiment 1: The installation position of the workpiece 5 to be measured is directly related to the eccentric action position 301. Two workpieces 5 to be measured are connected to one eccentric action position 301. The two workpieces 5 to be measured can be synchronously moved under the action of the same action crankshaft 3. For specific performance, refer to Figure 5Explanation: When the action crankshaft 3 rotates clockwise, the rotation point of the action crankshaft 3 is A, and the connection point between the pneumatic connecting rod 4 and the action crankshaft 3 is B. The workpiece 5 to be tested at the left position is pulled by the action crankshaft 3, which can be indirectly understood as: the connection point B of the workpiece 5 to be tested at the left position rotates counterclockwise along the rotation point A, so the slider in the workpiece 5 to be tested at the left position moves linearly from left to right on the guide rail, and in this process, the connection point B of the workpiece 5 to be tested at the right position rotates clockwise along the rotation point A. Therefore, the slider in the workpiece 5 to be tested at the right position moves linearly from right to left on the guide rail, so that the connection point B in the two pneumatic connecting rods 4 jointly completes a 360° rotation. When the action crankshaft 3 rotates 180°, the two workpieces 5 to be tested jointly complete a reciprocating motion, specifically corresponding to the unidirectional part and the complementary part, so that after the two workpieces 5 to be tested perform a unidirectional movement, the pressure value in the pneumatic connecting rod 4, the current value in the drive motor assembly 2, and the temperature value and vibration frequency in the workpiece 5 to be tested perform a complementary analysis action. Embodiment 3: The operation process of the integrated detection module is described as follows in combination with the relevant contents in Embodiment 1 and Embodiment 2: S1: Ft, It, Tt and Qt are respectively represented as pressure value, current value, temperature value and vibration frequency. First, the pressure value Ft is explained: As shown in the first embodiment, the pressure values ​​of the two gas chambers in the pneumatic connecting rod 4 are equal in the initial state. When the workpiece 5 to be measured in the one-way part and the complementary part moves synchronously, the gas in one of the gas chambers of the pneumatic connecting rod 4 is compressed, so that the pressure value Ft therein increases. Therefore, the pressure value, temperature value and vibration frequency can be further divided into: Ft z and Ft. y , Tt z and Tt y and Qt z and Qt y and Ft z and Ft. y For explanation, the two represent the pressure values ​​in the one-way part and the complementary part respectively, and so on; S2: Because the moving directions of the workpiece 5 to be tested in the unidirectional part and the complementary part are opposite but the moving strokes are equal, if the whole workpiece 5 to be tested is in the best state, Ft z and Ft. y , Tt z and Tt y and Qt z and Qt yThe error is very small or even non-existent. For this complementary analysis action, it is necessary to further set the constant current value Io in the drive motor assembly 2, and synchronously obtain the error ratio of the associated pressure value, temperature value, vibration frequency and current value when the action crankshaft 3 rotates at a constant speed. Specifically, it is expressed as MF=Ft z / Ft y MT=Tt z / Tt y 、MQ=Qt z and Qt y And MI=Io / It, and needs to be based on Ft z and Ft. y , Tt z and Tt y , Qt z and Qt y As well as the specific values ​​of Io and It, MF, MT, MQ and MI are restricted to values ​​greater than 1; S3: Based on the technology in S2, the complementary analysis action is judged again, which is specifically manifested as follows: S3-1: The intermediate coefficient 1.09 is set based on the error ratio of MI. A brief explanation of 1.09 is that since there is friction resistance between the slider and the guide rail in the workpiece 5 to be tested, the drive motor assembly 2 is always in a load state, so Io in the drive motor assembly 2 is less than It. For this, 0.09 is used as the error value. When 1<MI<1.09, it means that the sealing performance of the workpiece 5 to be tested is in a better state. When MI>1.09, MF, MT, and MQ are recorded synchronously, and it is first determined that the sealing performance of the workpiece 5 to be tested is in a defective state, and then the detailed state of the workpiece 5 to be tested is determined according to the specific values ​​of MF, MT, and MQ.

[0018] S4: Combined with the relevant content in S3, the following is explained: synchronously record the number of rotations of the action crankshaft 3 when the optimal state or defective state appears. The more the number of rotations of the action crankshaft 3 when the optimal state or defective state appears, the better the sealing performance of the workpiece 5 to be tested is.

[0019] In summary: the functional test process of the linear guide is optimized, specifically as follows: two workpieces to be tested are set on both sides of the action crankshaft, and a number of eccentric action positions are set on the action crankshaft, which is mainly used to limit the setting positions of the rotation point A and the connection point B, so that one end of the pneumatic connecting rod can be eccentrically rotated through the action crankshaft. While maintaining the horizontal sliding of the workpiece to be tested, the application requirements of different force directions can be simulated, and the action crankshaft can promote the workpiece to be tested to perform two reciprocating motions when completing a single full rotation, which is mainly used to shorten the test time. The key content is: using the current value of the drive motor assembly as the basic reference condition, and using the pressure value, temperature value and vibration frequency to calculate the error ratio for complementary analysis, so as to make a state judgment on the sealing performance.

[0020] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0021] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0022] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A sealing performance testing device for a linear guide rail rubber seal, comprising a housing (1) and a workpiece to be tested (5), characterized in that: An operating crankshaft (3) and a drive motor assembly (2) are arranged in the machine body shell (1), and both ends of the operating crankshaft (3) are mounted on the output ends of the drive motor assembly (2); The workpiece (5) to be measured is arranged at two end positions of the working crankshaft (3) in a manner perpendicular to the length direction of the working crankshaft (3); a pneumatic connecting rod (4) is arranged between the workpiece (5) to be measured and the working crankshaft (3); and the two end positions of the pneumatic connecting rod (4) are rotatably connected to the working crankshaft (3) and the workpiece (5) to be measured; The action crankshaft (3) is provided with a plurality of eccentric action positions (301), the center points of the plurality of eccentric action positions (301) are not on the same axis, and the center point of the eccentric action position (301) and the center point of the output end of the drive motor assembly (2) are not on the same axis; An integrated detection module associated with a plurality of workpieces to be tested (5) and a drive motor assembly (2) is provided on the body shell (1), wherein the integrated detection module comprises a temperature sensor applied on the workpieces to be tested (5), a vibration frequency sensor, a current detector applied on the drive motor assembly (2), and a pressure sensor applied on the pneumatic connecting rod (4).

2. The sealing performance detection device for a linear guide rail rubber seal according to claim 1, characterized in that: The rotation point of the driving motor assembly (2) and the action crankshaft (3) is set to A, and the connection point between the eccentric action position (301) in the action crankshaft (3) and one end of the pneumatic connecting rod (4) is set to B.

3. The sealing performance detection device for a linear guide rail rubber seal according to claim 2, characterized in that: One of the workpieces to be measured (5) disposed at both sides of an eccentric action position (301) in the action crankshaft (3) is set as a one-way portion, and the other workpiece to be measured (5) disposed at both sides of an eccentric action position (301) in the action crankshaft (3) is set as a complementary portion, wherein the sliding directions of the workpieces to be measured (5) in the one-way portion and the complementary portion are opposite.

4. The sealing performance detection device for a linear guide rail rubber seal according to claim 3, characterized in that: The integrated detection module performs complementary analysis on the pressure value, current value, temperature value and vibration frequency in the complementary part and the unidirectional part, and sets the pressure value, current value, temperature value and vibration frequency to Ft, It, Tt and Qt respectively, and splits Ft, Tt and Qt into: Ft according to the unidirectional part and the complementary part. z and Ft. y , Tt z and Tt y and Qt z and Qt y , and set the constant current value Io in the drive motor assembly (2).

5. The sealing performance detection device for a linear guide rail rubber seal according to claim 4, characterized in that: Ft z and Ft. y , Tt z and Tt y , Qt z and Qt y The error ratios of Io and It are calculated and expressed as MF, MT, MQ and MI respectively, and the error ratios of Io and It are calculated according to Ft z and Ft. y , Tt z and Tt y , Qt z and Qt y As well as the specific values ​​of Io and It, limit MF, MT, MQ and MI to values ​​greater than 1.

6. The sealing performance detection device for a linear guide rail rubber seal according to claim 5, characterized in that: The intermediate coefficient is set to 1.09 based on the error ratio of MI, and the following state analysis results are set according to the intermediate coefficient 1.09: State 1: When 1<MI<1.09, it indicates that the sealing performance of the workpiece (5) to be tested is in a better state; State 2: When MI>1.09, it indicates that the sealing performance of the workpiece (5) to be tested is in a defective state, and MF, MT, and MQ are synchronously marked to determine the detailed state of the workpiece (5) to be tested.

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