Static force loading test bench

Abstract

The invention discloses a static loading test bench, and belongs to the technical field of servo mechanism tests. The test bed comprises a portal frame, a force loading assembly and a force implementation assembly. One end of the force applying assembly is fixed at the top end of the door frame, the other end of the force applying assembly is connected with the tested servo mechanism through the force loading assembly, and the other end of the tested servo mechanism is fixed on the bottom surface of the door frame. And a force applying assembly. The force loading assembly realizes quadrilateral diagonal tightening and opening through forward and reverse rotation of a hand wheel and drives the force loading assembly to move, so that the force loading assembly generates continuously adjustable pressure or pulling force applied to the tested servo mechanism, stretching and compression loading examination of the self-locking capability of the servo mechanism is realized, and the device has the advantages of simple structure, convenience in movement, high reliability and the like. And the occupied space is small.

Description

Technical Field

[0001] The invention relates to a static loading test bench, belonging to the technical field of servo mechanism testing. Background Art

[0002] The static loading test bench is a loading test bench used to inspect the hydraulic lock on the servo mechanism. With the development of science and technology, the performance index requirements of the servo mechanism are becoming more and more stringent. The locking capacity of the hydraulic lock affects the zero position retention of the servo mechanism under the presence of external loads. In addition, the internal leakage of the hydraulic lock has a greater impact on the overall dynamic characteristics. Based on the above needs, the development of static loading test benches is promoted.

[0003] Traditional loading test benches include electro-hydraulic servo loading type and mechanical loading type through mass block loading. However, the electro-hydraulic servo loading type is more complicated in structure and operation, and requires test personnel to monitor the system operation in real time. The mechanical type is widely used due to its simple structure, easy operation, and many advantages such as long-term loading without supervision.

[0004] Chinese patent CN106404401B proposes a servo mechanism zero-position locking test bench and test method, which consists of a frame assembly, a mass block assembly and a mechanical lever. The loading platform cannot continuously adjust the pulling pressure. Each time the pulling or pressing direction is changed or the pulling force is adjusted, the mass block assembly needs to be removed by a crane, which is time-consuming and labor-intensive. Summary of the invention

[0005] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art and to propose a static loading test bench to apply a continuously adjustable tensile and compressive static load to a servo mechanism to examine the hydraulic locking function of the servo mechanism.

[0006] The technical solution of the present invention is:

[0007] A static loading test bench comprises a gantry, a force loading component and a force implementing component;

[0008] The gantry is a vertical frame structure, one end of the force implementation component is fixed to the top of the gantry, and the other end is connected to the tested servo mechanism through the force loading component, and the other end of the tested servo mechanism is fixed to the bottom surface of the gantry;

[0009] The force implementation assembly comprises a lower trunnion, an upper trunnion, two guide rings, a connecting rod, a lead screw shaft and a force application part; the upper trunnion, a guide ring, the lower trunnion and another guide ring are sequentially connected by the connecting rod to form a closed diamond structure; the two guide rings are provided with threads with opposite rotation directions, and the lead screw shaft is connected to the force application part after connecting the two guide rings; the upper trunnion is connected to the top of the gantry, and the lower trunnion is connected to the force loading assembly;

[0010] Under the action of the force implementing component, the force loading component applies a continuously adjustable pressure or tension to the servo mechanism under test, thereby testing the hydraulic locking function of the servo mechanism under test.

[0011] Further, the force loading assembly includes a loading shaft, a lower end cover, an upper end cover, a retaining ring, a disc spring, a sleeve and an upper support ear;

[0012] The sleeve is a cylindrical structure, and two retaining rings are located at both ends of the inner cavity of the sleeve;

[0013] The two retaining rings have the same structure, both of which are cylindrical structures with a light hole in the middle;

[0014] The upper end cover and the lower end cover are connected to the two ends of the sleeve respectively, and both have light holes in the middle;

[0015] The loading shaft is a hydraulically symmetrical piston rod-shaped structure. The hydraulically symmetrical piston is located in the middle of the inner cavity of the sleeve. The rods at both ends pass through the light holes of the retaining ring on the same side and the light holes of the upper and lower end covers respectively, and then are connected to the lower ear shaft and the upper ear respectively. The loading shaft can slide freely axially in the sleeve.

[0016] A plurality of disc springs are installed on both sides of the hydraulic symmetrical piston, one end of the disc spring is connected to the hydraulic symmetrical piston, and the other end is connected to the retaining ring on the side.

[0017] Furthermore, one end of the upper support ear is a pin hole for connecting to the piston rod support ear of the tested servo mechanism; the other end of the upper support ear is an external thread for connecting to the loading shaft portion and being locked by a locking nut.

[0018] Furthermore, the lower trunnion is connected to the end of the loading shaft through threads and is locked with a locking nut.

[0019] Furthermore, there are support ears and pin holes on both sides of the upper end of the lower support ear shaft, and the support ears are hingedly connected to the connecting rod through the pin.

[0020] Furthermore, the rod of the loading shaft is engraved with scales to facilitate reading the magnitude of the tension and pressure of the loading.

[0021] Furthermore, each connecting rod is a shaft with pin support ears at both ends, which is used to connect the upper support ear shaft, the lower support ear shaft or the two guide rings.

[0022] Furthermore, the two guide rings are both sheet-like structures, with internal threads arranged inside the sheet-like structures and support ear pin holes at both ends, which are respectively hinged to the connecting rods through pins.

[0023] Furthermore, the top of the upper support ear shaft is fixed to the top of the door frame by a locking nut; by adjusting the locking nut, the entire force implementation assembly is moved up and down, and the force implementation assembly drives the power loading assembly to move, so as to meet the test of the test servo mechanism with different installation zero position requirements.

[0024] Further, the gantry includes wheels, a stand and lower lugs;

[0025] The stand is a vertical frame structure, with a beam at the upper end and a flat plate at the lower end, and the upper and lower ends are connected by two columns;

[0026] A plurality of wheels are installed at the lower part of the flat plate to support and move the entire test bench;

[0027] The lower end of the lower support ear is installed on the upper surface of the flat plate, and the upper end is a pin shaft hole for connecting with the cylinder support ear of the tested servo mechanism.

[0028] The advantages of the present invention compared with the prior art are:

[0029] (1) The present invention adopts a static loading method of a movable door frame and a handwheel-type loading test bench with reverse self-locking capability to realize the tensile and compressive loading assessment of the self-locking capability of the servo mechanism, and has the advantages of simple structure, convenient movement, and small space occupation.

[0030] (2) The present invention adopts a quadrilateral diagonal tightening and opening adjustment structure and a bidirectional disc spring loading structure, which can realize the tensile and compressive force loading of the servo mechanism by rotating the hand wheel forward and reverse, and has the advantage of simple operation.

[0031] (3) The hand-wheel type loading test bench designed by the present invention can be adjusted up and down by double nuts, so as to realize the tensile and compressive loading assessment of the servo mechanism with different zero position lengths, and has the advantage of strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0033] Figure 1 This is a schematic diagram of the structure of a static loading test bench according to an embodiment of the present invention;

[0034] Figure 2 It is a partially enlarged schematic diagram of the force loading component of the static loading test bench according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0036] The present invention proposes a static loading test bench, which is a brand-new test equipment for testing the zero-position locking function of a servo mechanism. It generates axial force through a disc spring to apply continuously adjustable tensile and compressive static forces to the servo mechanism under test, thereby solving the problems of complex operation and low reliability of existing electro-hydraulic servo loading test benches.

[0037] This test bench includes a gantry, a force loading assembly and a force implementation assembly. One end of the force implementation assembly is fixed to the top of the gantry, and the other end is connected to the test servo mechanism through the force loading assembly. The other end of the test servo mechanism is fixed to the bottom surface of the gantry.

[0038] like Figure 1 As shown, the gantry includes four wheels 1, a test bench 2, and a lower support ear 3. The four wheels 1 are installed on the lower bottom surface of the test bench 2 by bolts, and are used to support and move the entire test bench. The lower support ear 3 is installed on the upper bottom surface of the test bench 2 by bolts. Among them, the wheel 1 is a standard part, the test bench 2 is a steel welded part, and the gantry is T-shaped as a whole. The two vertical steel sections are supported by reinforced steel on both sides. The bottom surface of the lower support ear 3 is a flange, and the four light holes are used to pass screws to fix it on the test bench 2. The upper end is a pin shaft hole, which is used to connect with the cylinder support ear of the tested servo mechanism 4.

[0039] The force loading assembly includes a loading shaft 7, a lower end cover 8, an upper end cover 12, two retaining rings 9, a number of disc springs 11, a sleeve 10, and an upper support ear 5. The loading shaft 7 is in the shape of a hydraulic symmetrical piston rod, which is hollow inside and has an external thread at the bottom, which is used to connect with the upper support ear 5. The upper end of the lower end cover 8 is internally threaded, the lower end is externally hexagonal, and there is a light hole in the middle, allowing the loading shaft 7 to slide axially freely. The retaining ring 9 is an annular structure, with two cylinders of unequal diameters and a light hole in the middle. The sleeve 10 is a cylindrical structure, with external threads at both ends and a light hole in the middle, which can allow the piston of the loading shaft 7 to slide axially inside it. In the middle of the outer circle of the cylinder, two symmetrical small planes are processed to fix the sleeve when the upper end cover 12 and the lower end cover 8 are installed on the sleeve. The disc spring 11 is a standard part. Such as Figure 2As shown, the loading shaft 7 is installed in the sleeve 10 and can slide freely in the axial direction. Disc springs 11 are installed on both sides of the loading shaft piston. The disc springs are supported by the lower end cover 8 and the upper end cover 12 through the retaining ring 9. The upper end cover and the lower end cover are connected to the sleeve 10 through their own threads. One end of the upper support ear 5 is a pin shaft hole for connecting with the piston rod support ear of the tested servo mechanism 4, and the other end is an external thread for connecting with the loading shaft 7 and locking through the locking nut 6. The locking nut 6 is a standard part.

[0040] The force implementation assembly includes a locking nut 13, a lower trunnion 14, an upper trunnion 15, two locking nuts 16, eight pins 17, two guide rings 19, four connecting rods 18, a screw shaft 20, and a handwheel 21. The lower end of the lower trunnion 14 is externally threaded and is threadedly fastened to the upper end cover 12. There are supporting ears and pin holes on both sides of the upper end, which are respectively hinged to the connecting rod 18 through the pin 17. The upper trunnion 15 and the lower trunnion 14 are similar in structure, except that the thread length at the upper end is longer than that of the upper trunnion 15. The locking nut 16 is a standard part and is used to fix the upper trunnion 15 and the stand 2. The pin 17 is a standard part and is used to hinge the connecting rod 18 with the upper trunnion 15, the lower trunnion 14, and the guide ring 19. The connecting rod 18 is a shaft with pin supporting ears at both ends, which is used to connect the upper trunnion 15, the lower trunnion 14, and the guide ring 19. The guide ring 19 is a sheet structure with upper and lower ear pin holes, which are respectively hinged with the connecting rod 18 through the pin 17. The lead screw 20 and the hand wheel 21 are standard parts.

[0041] The upper trunnion 15, the lower trunnion 14 and the two guide rings 19 are connected by connecting rods 18 at four vertices through the pin shaft 17 to form a diamond structure. The lower trunnion 14 is installed in the upper end cover 12 through an external thread and is locked by a locking nut 13. The upper trunnion 15 is installed below the top of the stand 2 through two locking nuts 16. The screw shaft 20 passes through the two guide rings 19, and the internal threads of the two guide rings are rotated in opposite directions. The handwheel 21 is fixed to the screw shaft 20 by a nut. In order to make the drawing clear, the screws and standard parts mentioned above that play a fixing role are shown in the figure. Figure 1 Not all are shown.

[0042] The servo mechanism 4 under test is a test piece. In addition to the hydraulic servo mechanism, the test piece can also be other test pieces that need to be statically loaded. It only needs to make corresponding changes to the connecting parts. The method for testing the servo mechanism 4 under test on this test bench is:

[0043] The servo mechanism 4 under test is installed in the test stand 2 and is respectively connected to the lower ear 3 and the upper ear 5. The two locking nuts 16 of the upper ear shaft 15 are adjusted to complete the up and down movement of the upper ear 5 to meet the test of the servo mechanism 4 under test with different installation zero position requirements.

[0044] Rotating the hand wheel 21 forward or backward makes the two guide rings 19 of the diamond structure move toward and in the opposite direction, thereby driving the upper end cover 12, sleeve 10, lower end cover 8, retaining ring 9 to move up and down, pushing the disc springs on both sides of the piston of the loading shaft 7 to compress and transmit it to the loading shaft, which is manifested as applying tension and pressure to the tested servo mechanism 4. The loading shaft 7 is engraved with scales to facilitate reading the size of the tension and pressure of the loading.

[0045] The beneficial effects of this test bench include:

[0046] (1) When the locking function of the servo mechanism under test is tested for tension and pressure, it is only necessary to turn the hand wheel, and the lead screw drives the two guide rings to move toward or away from each other, thereby deforming the rhombus formed by the connecting rod. Because the upper trunnion is fixed, the rotation of the lead screw driven by the hand wheel will cause the lower trunnion to move up and down, and then drive the upper end cover, sleeve and lower end cover to move up and down together, thereby compressing the disc spring assemblies on both sides of the loading shaft piston and transmitting the tension pressure to the servo mechanism piston rod;

[0047] (2) By adjusting the two locking nuts 16, the upper support ear 5 can be moved up and down, which can meet the installation requirements of the zero position of different servo mechanisms and the static loading test of different servo mechanisms;

[0048] (3) The loading tension is continuously adjustable, and the loading load can be observed through the scale on the loading shaft 7;

[0049] (4) Changing the connection form of the upper and lower ears can meet the needs of other products or components that require static loading tests except for servo mechanisms;

[0050] (5) The purely mechanical loading test bench has a simple and reliable structure and can meet the needs of long-term loading tests without human supervision.

[0051] The above-described embodiments are only preferred specific implementations of the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A static loading test bench, characterized in that: It includes a gantry, a force loading assembly and a force implementing assembly; The gantry is a vertical frame structure, one end of the force implementation component is fixed to the top of the gantry, and the other end is connected to the tested servo mechanism through the force loading component, and the other end of the tested servo mechanism is fixed to the bottom surface of the gantry; The force implementation assembly comprises a lower trunnion, an upper trunnion, two guide rings, a connecting rod, a lead screw shaft and a force application part; the upper trunnion, a guide ring, the lower trunnion and another guide ring are sequentially connected by the connecting rod to form a closed diamond structure; the two guide rings are provided with threads with opposite rotation directions, and the lead screw shaft is connected to the force application part after connecting the two guide rings; the upper trunnion is connected to the top of the gantry, and the lower trunnion is connected to the force loading assembly; Under the action of the force implementing component, the force loading component applies a continuously adjustable pressure or tension to the servo mechanism under test, thereby testing the hydraulic locking function of the servo mechanism under test.

2. A static loading test bench according to claim 1, characterized in that: The force loading assembly includes a loading shaft, a lower end cover, an upper end cover, a retaining ring, a disc spring, a sleeve and an upper support ear; The sleeve is a cylindrical structure, and two retaining rings are located at both ends of the inner cavity of the sleeve; The two retaining rings have the same structure, both of which are cylindrical structures with a light hole in the middle; The upper end cover and the lower end cover are connected to the two ends of the sleeve respectively, and both have light holes in the middle; The loading shaft is a hydraulically symmetrical piston rod-shaped structure. The hydraulically symmetrical piston is located in the middle of the inner cavity of the sleeve. The rods at both ends pass through the light holes of the retaining ring on the same side and the light holes of the upper and lower end covers respectively, and then are connected to the lower ear shaft and the upper ear respectively. The loading shaft can slide freely axially in the sleeve. A plurality of disc springs are installed on both sides of the hydraulic symmetrical piston, one end of the disc spring is connected to the hydraulic symmetrical piston, and the other end is connected to the retaining ring on the side.

3. A static loading test bench according to claim 2, characterized in that: One end of the upper support ear is a pin hole for connecting with the piston rod support ear of the tested servo mechanism; the other end of the upper support ear is an external thread for connecting with the loading shaft rod part and being locked by a locking nut.

4. A static loading test bench according to claim 2, characterized in that: The lower trunnion is connected to the end of the loading shaft through threads and is locked with a locking nut.

5. A static loading test bench according to claim 1 or 4, characterized in that: There are support ears and pin holes on both sides of the upper end of the lower support ear shaft, and the support ears are hingedly connected to the connecting rod through the pin.

6. The static loading test bench according to claim 1, characterized in that: There are scales engraved on the rod of the loading shaft to facilitate reading the size of the loading tension and pressure.

7. The static loading test bench according to claim 1, characterized in that: Each connecting rod is a shaft with pin support ears at both ends, which is used to connect the upper support ear shaft, the lower support ear shaft or the two guide rings.

8. The static loading test bench according to claim 1, characterized in that: Both guide rings are of sheet-like structure, with internal threads arranged inside the sheet-like structure and support ear pin shaft holes at both ends, which are respectively hinged with the connecting rod through pin shafts.

9. The static loading test bench according to claim 1, characterized in that: The top of the upper trunnion is fixed to the top of the door frame by a locking nut; by adjusting the locking nut, the entire force implementation assembly moves up and down, and the force implementation assembly drives the power loading assembly to move, so as to meet the test of the servo mechanism under test with different installation zero position requirements.

10. The static loading test bench according to claim 1, characterized in that: The gantry includes wheels, a platform and lower lugs; The stand is a vertical frame structure, with a beam at the upper end and a flat plate at the lower end, and the upper and lower ends are connected by two columns; A plurality of wheels are installed at the lower part of the flat plate to support and move the entire test bench; The lower end of the lower support ear is installed on the upper surface of the flat plate, and the upper end is a pin shaft hole for connecting with the cylinder support ear of the tested servo mechanism.

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