Connecting structure for vibration test of on-load product and test system comprising same

Abstract

The invention discloses a connecting structure for vibration test of on-load products and a test system comprising the connecting structure, the connecting structure comprises an adjusting part connected with a transmission shaft, the adjusting part comprises at least one of a first adjusting part and a second adjusting part, the first adjusting part comprises an outer sleeve, a first flange and at least three groups of first adjusting parts, the first flange is provided with a connector arranged in the outer sleeve, the first flange is connected with the transmission shaft, and an adjusting gap is reserved between the connector and the outer sleeve in the radial direction; the number of the first adjusting parts in each set is at least two, each first adjusting part comprises an elastic block and is connected with the outer sleeve and the connector through two connecting bolts, and the second adjusting part is used for overcoming the axial telescopic force of the transmission shaft. By means of the connecting structure, swinging or shaking of the transmission shaft can be counteracted, meanwhile, by arranging the adjusting gap, the adjusting space for position restoration during swinging of the transmission shaft is larger, and the bending force on the transmission shaft is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration testing, and in particular to a connection structure for vibration testing of loaded products and a testing system comprising the same. Background Art

[0002] When testing a product's vibration performance, it must be placed in an operating state (also known as a "loaded" state). Therefore, the drive shaft of the driving source must be directly or indirectly connected to the product. Consequently, when the product is subjected to vertical or horizontal vibration, or reciprocating vibration parallel to the horizontal plane, the drive shaft will inevitably shake, sway, or vibrate, or be subjected to axial expansion and contraction forces. Since the driving source is fixed, this can easily cause the drive shaft to bend or deform, or affect its transmission performance for the product being tested.

[0003] If the shaking, wobbling or vibration of the drive shaft is not controlled, the drive shaft may even swing significantly under vibration. Since the length of the drive shaft is usually about 1 meter, the swing amplitude of the end of the drive shaft away from the product will be amplified when the product vibrates, causing a huge howling noise during the vibration test. The drive shaft will also be unable to smoothly drive the input shaft of the product to rotate, making the product unable to be in normal working condition, thereby affecting the effect of the test of the product's vibration performance under load.

[0004] Furthermore, vibration testing of the product under test may require performance testing in multiple vibration directions. Consequently, the drive shaft may cause different oscillations or interference with the product under test depending on the test requirements. Consequently, different connection structures for vibration testing of the loaded product must be replaced to meet different test requirements, increasing labor burden and testing costs. Summary of the Invention

[0005] In order to overcome the above-mentioned shortcomings, one of the objects of the present invention is to provide a connection structure for vibration testing of loaded products, which is used to connect with a transmission shaft and an input shaft of a product to be tested, and includes an adjustment part connected to the transmission shaft, the adjustment part includes at least one of a first adjustment part and a second adjustment part, the first adjustment part includes: an outer sleeve, having a hollow cylindrical body; a first flange, having a connecting head arranged inside the outer sleeve and a first connecting edge with an outer diameter larger than the connecting head, the first flange is connected to the transmission shaft through the first connecting edge, and an adjustment gap is reserved in the radial direction between the connecting head and the outer sleeve; at least three groups of first adjusting parts, the number of the first adjusting parts in each group is at least two, the first adjusting part includes an elastic block, and a connecting bolt is respectively provided on two sides of the elastic block away from each other, and the studs of the two connecting bolts are arranged in directions away from each other, the first adjusting part is connected to the outer sleeve and the connecting head respectively through the two connecting bolts, and the second adjusting part is used to overcome the axial expansion and contraction force of the transmission shaft.

[0006] The present invention has the following beneficial effects: ① The elastic block of the first adjusting member of the first adjusting portion of the present application is connected to the outer sleeve and the connector respectively. Therefore, when the product to be tested is subjected to a force in a direction perpendicular to the transmission shaft, the transmission shaft vibrates and the gap between the outer sleeve and the connector changes. At this time, the elastic block applies a force opposite to the swinging force to the connector, thereby enabling the connector to always remain at the radial center of the outer sleeve. Since the connector is connected to the transmission shaft, the swing or shaking of the transmission shaft can be offset. By providing an adjustment gap between the outer sleeve and the connector, the transmission shaft has a larger adjustment space for position recovery when it swings, reducing the bending force on the transmission shaft. At the same time, it facilitates the deformation recovery of the first adjusting member, allowing the transmission shaft to maintain a radially centered position even when it vibrates and swings significantly, thereby preventing the transmission shaft from swinging under vibration, ensuring stable input of the circumferential rotational force of the product to be tested, without generating noise, and providing more accurate test results.

[0007] The present application arranges an elastic block on the outer peripheral side of the connector, thereby being able to quickly offset the swinging force exerted on the transmission shaft. Since the elastic block is respectively connected to the outer sleeve and the connector, the elastic block has a certain "rigidity" effect while maintaining the original elastic restoring force, thereby being able to quickly achieve the radial centering effect of the transmission shaft.

[0008] ② The first adjusting member of the present application is provided with a connecting bolt on both sides of the elastic block away from each other, and the studs of the two connecting bolts are arranged in directions away from each other, so that the first adjusting member can be quickly and conveniently connected to the outer sleeve and the connecting head.

[0009] ③ The present invention configures the first flange to have a connecting head arranged inside the outer sleeve and a first connecting edge with an outer diameter larger than the connecting head. Thus, the force acting on the transmission shaft is transmitted to the connecting head located inside the outer sleeve through the first connecting edge connected to the transmission shaft, and the position of the connecting head can be further adjusted and restored through the first adjusting member, thereby overcoming the shaking or swinging force acting on the transmission shaft.

[0010] ④ When the connection structure of the present invention includes both the first adjustment part and the second adjustment part, it can simultaneously offset the shaking or swaying of the transmission shaft and the telescopic force along the axial direction. Therefore, it can meet the requirements of performing multiple modes of vibration detection on the product, and there is no need to replace the connection structure when switching between different vibration detection modes.

[0011] Furthermore, a first receiving groove for accommodating a portion of the elastic block is provided on the surface of the connector near the outer sleeve, and a second receiving groove for accommodating a portion of the elastic block is provided on the outer sleeve in an area opposite the first receiving groove. Thus, the elastic block can be connected to both the outer sleeve and the connector simultaneously. Consequently, when the shaking or oscillating force exerted on the drive shaft is transmitted to the connector, the connector will also generate a radial oscillating force. At this time, the elastic block will quickly offset the vibration force exerted on the connector, positioning the connector in a radially centered position, thereby eliminating the shaking caused by vibration on the drive shaft.

[0012] Furthermore, a second mounting hole is provided on the wall of the outer sleeve, recessed toward its axial centerline. The second mounting hole is connected to the second receiving groove, and the inner diameter of the second mounting hole is larger than the diameter of the second receiving groove. A stepped structure is formed between the bottom of the second mounting hole and the second receiving groove. The stud portion of the connecting bolt of the first adjusting member is located within the second mounting hole. A blocking piece that can be sleeved on the connecting bolt is provided within the second mounting hole, and the blocking piece abuts against the stepped structure at the bottom of the second mounting hole. Therefore, by providing a locking nut within the second mounting hole that abuts against the blocking piece, the first adjusting member and the outer sleeve can be quickly connected.

[0013] Furthermore, the two connecting bolts of the first adjusting member are integrated with the elastic block, thereby facilitating connection of the first adjusting member with other structures and enabling the swinging force of the transmission shaft transmitted by the connector to be offset after being transmitted to the first adjusting member via the connecting bolts.

[0014] Furthermore, each set of first adjusting members includes two, and each set of first adjusting members is evenly distributed along the circumference of the outer sleeve. Thus, the two first adjusting members cooperate with each other to quickly offset the swing force applied to the connector, minimizing the swing amplitude of the transmission shaft connected to the connector.

[0015] Furthermore, the second adjustment portion includes two groups of second adjustment members respectively arranged near two ends of the transmission shaft that are far away from each other, and each group of the second adjustment members includes two U-shaped springs with openings arranged opposite to each other, the diameter direction of the opening of the U-shaped spring is along the length direction of the transmission shaft, and the length direction of the U-shaped spring is perpendicular to the axial direction of the transmission shaft. The adjustment portion of the present invention includes at least one of a first adjustment portion and a second adjustment portion, the first adjustment portion can overcome the swing of the transmission shaft during the vibration process, and the second adjustment portion can offset the vibration force along the axial direction of the transmission shaft. The second adjustment portion of the present application cleverly utilizes the U-shaped spring structure, and its adjustment space in the middle along the axial direction of the transmission shaft is larger, so that the axial compression deformation of the transmission shaft that can be offset is larger, which can be as high as 2-3cm, thereby meeting the vibration performance detection requirements for higher amplitudes.

[0016] Furthermore, two sets of second adjustment members, located at two ends of the drive shaft facing away from each other, are staggered at 90 degrees. Therefore, when the drive shaft rotates at high speeds, the two second adjustment assemblies achieve a staggered balance effect, minimizing interference with the axial expansion and contraction force of the drive shaft and maintaining overall transmission stability during testing.

[0017] Furthermore, a connecting plate for securing the U-shaped spring is disposed on each outer side of the U-shaped spring. When the connection structure for vibration testing of a loaded product includes a first adjustment portion and a second adjustment portion, two sets of the first adjustment portion are connected to the two ends of the transmission shaft, and two sets of connecting plates for the second adjustment portion are correspondingly disposed on the side of the first adjustment portion away from the transmission shaft. When the connection structure for vibration testing of a loaded product includes only the second adjustment portion, the connecting plate of the second adjustment portion is connected to the transmission shaft. Thus, the two U-shaped springs and the two connecting plates form an integrated structure with an adjustable compression range, and facilitate connection of the second adjustment portion to other mechanisms.

[0018] A second object of the present invention is to provide a vibration testing system, which includes the aforementioned connection structure for vibration testing of loaded products.

[0019] Furthermore, the system further includes an output shaft connected to the transmission shaft via the first adjustment portion and / or the second adjustment portion, a driving gear being disposed on the output shaft, and a driven gear being coaxially disposed on the input shaft of the product to be tested, wherein the tooth diameter of the driving gear is larger than the tooth diameter of the driven gear. Thus, by setting the tooth diameter ratio of the driving gear to the driven gear to be greater than 1, it is possible to simulate the higher operating speed conditions of the product to be tested while maintaining a relatively low speed of the drive source. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the first adjusting portion of the present invention being connected to the transmission shaft; Figure 2 This is a structural diagram of the first adjusting portion of the present invention when connected to the second flange; Figure 3 This is a structural schematic diagram of the first adjustment portion of the connecting structure of the present invention without the first adjustment member; Figure 4 It is a structural schematic diagram of the connection structure of the present invention when it is connected to the driving source and the transmission shaft; Figure 5 This is a schematic structural diagram of the connection structure of the present invention when the first adjustment part and the second adjustment part are provided at the same time; Figure 6 This is a structural diagram of the connection structure of the present invention when it only includes the second adjustment part.

[0021] In the picture: 1. Transmission shaft; 11. Second connecting edge; 2. Input shaft; 3. First adjustment portion; 31. Outer sleeve; 311. Accommodating groove 2; 312. Mounting hole 2; 32, first flange; 321, connector; 3211, receiving groove 1; 3212, mounting hole 1; 322, first connecting edge; 33. First adjusting member; 331. Elastic block; 332. Connecting bolt; 34. Adjusting gap; 35. Blocking piece; 4. Second adjusting portion; 41. Second adjusting member; 42. Connecting plate; 5. Second flange; 51. Avoidance groove; 52. Gasket; 53. Spring gasket. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0023] Example 1: See attached Figure 1-6As shown, the connection structure for vibration testing of a loaded product in this embodiment is connected to a drive shaft 1 and an input shaft 2 of the product under test. It includes a first adjustment portion 3 connected to the drive shaft 1. The drive shaft 1 is used to transmit the rotational force of the drive source to the product under test. The first adjustment portion 3 is used to offset the swing, vibration, or shaking force of the drive shaft 1 during the vibration testing of the loaded product, ensuring that the product under test is in a stable loaded operating state during vibration performance testing.

[0024] See attached Figure 2 and attached Figure 3 As shown, the first adjustment portion 3 of the present invention includes an outer sleeve 31, a first flange 32, and at least three sets of first adjustment members 33. The outer sleeve 31 has a hollow cylindrical body. The first flange 32 includes a connector 321 disposed inside the outer sleeve 31 and a first connection edge 322 having an outer diameter greater than that of the connector 321. The connector 321 and the first connection edge 322 are integral. The transmission shaft 1 is connected to the first connection edge 322 of the first flange 32. An adjustment gap 34 is reserved in the radial direction between the connector 321 and the outer sleeve 31. The first adjustment members 33 are connected to the outer sleeve 31 and the connector 321, respectively. The width of the adjustment gap 34 is set along the radial direction of the outer sleeve 31, and the length is set along the axial direction of the outer sleeve 31. The width of the adjustment gap 34 is generally 1-5 mm, for example, 1 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, etc. Therefore, when the transmission shaft 1 connected to the product to be tested swings due to vibration, the range of its swing is roughly within the conical space range with the straight line where the transmission shaft 1 is located when it is not vibrating as the central axis. By setting the adjustment gap 34, a larger adjustment distance can be formed. At the same time, with the action of the first adjustment member 33, the transmission shaft 1 can still maintain an axially centered position in a vibrating environment, so that the transmission shaft 1 will not swing under vibration, ensuring the stable input of the circumferential rotation force of the product to be tested, without generating noise and effectively simulating the loaded working state of the product, and the test results are more accurate.

[0025] The structure adopted in the prior art is to arrange an elastic sheet at the end of the transmission shaft 1 along the axial direction. When the transmission shaft 1 swings, since the elastic sheet is arranged along the axial direction, its force to overcome the swinging force of the transmission shaft 1 is weak, and since the transmission shaft 1 is in contact with or connected to the area of ​​the center of the elastic sheet, when the transmission shaft 1 applies a deformation force to the elastic sheet, the elastic sheet can allow the transmission shaft 1 to have a relatively limited displacement space in the swinging direction, and therefore, the ability to offset the swing of the transmission shaft is weak.

[0026] The number of each group of first adjusting members 33 of the present invention is at least two, and each group of first adjusting members 33 is distributed in sequence along the axial direction of the outer sleeve 31. The axial direction of the first adjusting member 33 is perpendicular to the axial direction of the outer sleeve 31. The first adjusting member 33 includes an elastic block 331 with elastic deformation capability (for example, the elastic block 331 can be made of elastic rubber or silicone material), and a connecting bolt 332 is respectively provided on two sides of the elastic block 331 away from each other. The studs of the two connecting bolts 332 are arranged in directions away from each other. Therefore, when installing the first adjusting member 33, one connecting bolt 332 can be connected to the connecting head 321, and the other connecting bolt 332 can be connected to the wall of the outer sleeve 31.

[0027] The connection structure of the present invention, by providing an elastic block 331 on the outer circumference of the connector 321, can quickly offset the swinging force exerted on the transmission shaft 1. Since the elastic block 331 is respectively connected to the outer sleeve 31 and the connector 321, the elastic block 331 has a certain "rigidity" effect while maintaining its original elastic restoring force. Therefore, it can quickly achieve the effect of radial centering of the transmission shaft 1, thereby minimizing the swing of the transmission shaft 1 caused by vibration. By providing an adjustable gap 34 between the outer sleeve 31 and the connector 321, the adjustment space for the transmission shaft 1 to restore its position during swinging is larger, and the bending force on the transmission shaft can also be reduced.

[0028] There is also a gap between the side of the connecting head 321 close to the bottom of the barrel of the outer sleeve 31 and the bottom of the barrel, thereby facilitating the rapid restoration of the position of the connecting head 321 in the outer sleeve 31 to the center position.

[0029] In some embodiments, the two connecting bolts 332 of the first adjusting member 33 are integral with the elastic block 331. For example, the two connecting bolts 332 can be directly injection-molded into an integral part with the elastic block 331 during the injection molding of the elastic block 331. This facilitates the connection of the first adjusting member 33 with other structures, and the integral structure of the first adjusting member 33 facilitates the transmission shaft 1 swinging force transmitted by the connector 321 to be transmitted to the first adjusting member 33 through the connecting bolts 332 and offset.

[0030] In other possible embodiments, the connecting bolt 332 and the elastic block 331 can also be separate parts. A limiting hole for accommodating the head of the connecting bolt 332 is also provided on one side of the elastic block 331 close to the connecting head 321 and the outer sleeve 31. The hole wall of the limiting hole can limit and wrap the head of the connecting bolt 332, thereby enabling the connecting bolt 332 to form a tighter connection effect with the elastic block 331. Furthermore, when the product is subjected to load testing, when the transmission shaft 1 generates a swinging force, the connecting head 321 also swings in the outer sleeve 31. At this time, the elastic block 331 brings a restoring force to keep the connecting head 321 in a radially centered position, thereby overcoming the swinging force on the transmission shaft 1 and always keeping the transmission shaft 1 in a centered position.

[0031] See attached Figure 3 In some embodiments, a first receiving groove 3211 for accommodating a portion of the elastic block 331 is provided on the outer surface of the connector 321, and a second receiving groove 311 for accommodating a portion of the elastic block 331 is provided on the area of ​​the outer sleeve 31 opposite to the first receiving groove 3211. That is, the elastic block 331 is connected to both the outer sleeve 31 and the connector 321, and the volume and height of the elastic block 331 in the first receiving groove 3211 and the second receiving groove 311 are similar. Therefore, after the vibration force applied to the transmission shaft 1 is transmitted to the connector 321, the connector 321 will also generate a radial swinging force. At this time, the elastic block 331 will quickly offset the vibration force applied to the connector 321, placing the connector 321 in a radially centered position, thereby eliminating the shaking caused by the vibration on the transmission shaft 1.

[0032] In some embodiments, a mounting hole 3212 communicating with the receiving groove 3211 is further provided on the connecting head 321 , and the screw of the connecting bolt 332 of the first adjusting member 33 close to the connecting head 321 can be installed in the mounting hole 3212 .

[0033] A second mounting hole 312 is provided on the wall of the outer sleeve 31, which is recessed toward its axial center line. The second mounting hole 312 is communicated with the second accommodating groove 311, and the inner diameter of the second mounting hole 312 is larger than the aperture of the second accommodating groove 311. A stepped structure is formed between the bottom of the second mounting hole 312 and the second accommodating groove 311. The stud portion of the connecting bolt 332 of the first adjusting member 33 is located in the second mounting hole 312. By providing a baffle 35 that can be sleeved on the connecting bolt 332 in the second mounting hole 312, and abutting the baffle 35 against the stepped structure area at the bottom of the second mounting hole 312, the adjusting bolt and the outer sleeve 31 are quickly connected by providing a locking nut.

[0034] In some embodiments, the groups of first adjusting members 33 of the present invention are evenly distributed along the circumferential direction of the outer sleeve 31 , thereby making the centering force applied by the first adjusting members 33 to the connector 321 more uniform.

[0035] In some embodiments, each group of first adjusting members 33 includes two, and is arranged along the axial direction of the transmission shaft 1. By providing two first adjusting members 33 in each group, it is possible to fully ensure that a restoring force is applied to the connector 321 to keep it centered, and the two first adjusting members 33 can minimize the swing of the connector 321 during vibration (when there is only one first adjusting member 33 in each group, although it still generates an elastic force to center the connector 321, the connector 321 still swings slightly; and when two first adjusting members 33 are provided, the connector 321 still swings slightly. Parts 33, the two can form a mutually restraining "pulling force" on the connecting head 321. For example, one first adjusting part 33 applies a force on the connecting head 321 in the direction away from the axial center line of the connecting head 321, while the other first adjusting part 33 applies a force on the connecting head 321 in the direction close to the axial center line of the connecting head 321. Therefore, under the mutual cooperation of the two first adjusting parts 33, the swing force on the connecting head 321 is quickly offset, thereby ensuring that the swing amplitude of the transmission shaft 1 connected to the connecting head 321 is reduced to the greatest extent).

[0036] In some embodiments, a first adjustment portion 3 is provided at each end of the transmission shaft 1 and is connected to the output shaft of the driving source and the input shaft 2 (or its transmission assembly) of the product to be tested, respectively.

[0037] In some embodiments, see Appendix Figure 1 As shown, a second connecting edge 11 opposite to the first connecting edge 322 of the first flange 32 is provided at one end of the transmission shaft 1 close to the first flange 32, and a plurality of connecting holes that can penetrate each other are provided on the first connecting edge 322 and the second connecting edge 11. The transmission shaft 1 can be connected to the first adjusting part 3 by installing fixing bolts in the connecting holes.

[0038] In some embodiments, see Appendix Figure 3 and attached Figure 4As shown, the output shaft of the driving source is connected to the connection structure of the present invention through the second flange 5. The output shaft of the driving source passes through the middle of the second flange 5. A concave avoidance groove 51 is provided at the end of the second flange 5 away from the driving source. By setting the nut in the avoidance groove 51, it is convenient to connect with the output shaft of the driving source without hindering the connection of the second flange 5 with the connection structure of the present invention. A plurality of mounting holes are provided on the side wall of the outer sleeve 31 on the side close to the second flange 5. Correspondingly, a hole body is provided on the second flange 5 in the axial direction of the second flange 5 that passes through the mounting hole. The connecting bolt 332 that passes through the hole body can be connected to the mounting hole, thereby realizing the connection of the second flange 5 with the connection structure of the present invention. A gasket 52 and a spring gasket 53 are also provided in sequence on the side of the nut close to the driving source, thereby ensuring a more stable connection with the output shaft of the driving source.

[0039] See attached Figure 5 and attached Figure 6 In some embodiments, the connection structure of the present invention also includes a second adjustment portion 4, which includes two groups of second adjustment members 41 respectively arranged at two ends away from each other close to the transmission shaft 1, each group of second adjustment members 41 is a U-shaped spring with two openings arranged opposite to each other, and the diameter direction of the opening of the U-shaped spring is along the length direction of the transmission shaft 1, and the length direction of the U-shaped spring is perpendicular to the axial direction of the transmission shaft 1.

[0040] The connection structure of the present invention can offset the vibration force in the axial direction of the transmission shaft 1 through the second adjustment member 41. The two sets of second adjustment members 41 arranged at two ends away from each other near the transmission shaft 1 of the present invention are staggered at 90 degrees, so that when the transmission shaft 1 rotates at high speed, a dislocation balance effect can be formed. In this embodiment, a U-shaped spring with openings arranged opposite to each other is used as the second adjustment part 4, and a connecting plate 42 for fixing the U-shaped spring is respectively provided on the two outer sides of the U-shaped spring. Therefore, the two U-shaped springs and the two connecting plates 42 can form an integral structure with an adjustable compression range in the axial direction of the transmission shaft 1, and it is convenient to connect the second adjustment part 4 with other mechanisms. Since the diameter of the arc-shaped cross-section of the opening of the U-shaped spring is set along the axial direction of the transmission shaft 1, when the transmission shaft 1 is subjected to axial compression, the U-shaped spring can apply a reverse force to the transmission shaft 1, thereby offsetting the compression force of the transmission shaft 1 in the axial direction, ensuring stable power output.

[0041] The connection structure of this embodiment prevents the transmission shaft 1 from swinging during vibration and offsets the vibration force along the axial direction of the transmission shaft 1. Therefore, it can meet the testing requirements for various vibration modes of the product and ensure stable power input to the product during vibration testing. It can effectively simulate the loaded state of the product without generating noise caused by the shaking or trembling of the transmission shaft 1 during the vibration process.

[0042] Compared with the structure of the prior art in which cowhide or other elastic sheets are arranged between two connecting plates, the second adjustment portion 4 of this embodiment has a larger adjustment space in the middle part along the axial direction of the transmission shaft 1, so it can offset a larger axial compression deformation of the transmission shaft 1, which can be as high as 2-3cm. If only an elastic sheet is arranged, the axial deformation that can be offset is usually only 2-3mm.

[0043] In some embodiments, two sets of first adjustment parts 3 are directly connected to the two ends of the transmission shaft 1, and two sets of second adjustment parts 4 are respectively arranged on the side of the first adjustment part 3 away from the transmission shaft 1. The outer sleeve 31 of the first adjustment part 3 is generally open cylindrical. The bottom wall of the outer sleeve 31 is located at the end away from the transmission shaft 1 and is connected to the connecting plate 42 on one side of the second adjustment member 41. Correspondingly, the connecting plate 42 on the other side of the second adjustment member 41 is connected to the second flange 5.

[0044] See attached Figure 6 In some embodiments, the connection structure of the present invention only includes the second adjustment portion 4, but does not include the first adjustment portion 3. Therefore, the connection structure of this embodiment can be applied to the case where the transmission shaft 1 only produces axial expansion and contraction deformation.

[0045] Example 2: This embodiment is a vibration testing system for a loaded product, which includes the connection structure and vibration table for vibration testing of a loaded product of embodiment one. By placing the product to be tested on an extended table connected to the vibration table and connecting the transmission shaft 1 to the input shaft 2 of the product, a vibration test of the product under load can be achieved.

[0046] When the load speed requirement of the product to be tested is high, an output shaft connected to the transmission shaft 1 through the first adjustment portion 3 and / or the second adjustment portion 4 can be provided, and a driving gear can be provided on the output shaft. Accordingly, a driven gear can be coaxially provided on the input shaft 2 of the product to be tested, and the tooth diameter of the driving gear can be set to be larger than the tooth diameter of the driven gear. Therefore, by setting the tooth diameter ratio of the driving gear to the driven gear to be greater than 1 or higher, the high operating speed of the product to be tested can be simulated under the premise of a relatively low speed of the driving source. Since the speed of the driving source is reduced, the shaking amplitude of the transmission shaft 1 can also be fundamentally reduced. For example, if the product to be tested is a generator, after the generator is connected to the performance test instrument, when the performance of the generator needs to be tested at a speed of 6000 rpm and under vibration, it is only necessary to set the wheel diameter ratio of the driving gear to the driven gear to 3:1. Then, only the output speed of the driving source needs to be 2000 rpm to meet the performance test requirements of the generator at a load speed of 6000 rpm and under vibration.

[0047] The above embodiments are only for illustrating the technical concept and features of the present invention. Its purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. It cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A connection structure for vibration testing of a loaded product, used to connect with a transmission shaft and an input shaft of a product to be tested, comprising an adjustment portion connected to the transmission shaft, characterized in that: The adjustment portion includes at least one of a first adjustment portion and a second adjustment portion, The first adjustment unit includes: An outer sleeve having a hollow cylindrical body; a first flange having a connecting head disposed inside the outer sleeve and a first connecting edge having an outer diameter larger than that of the connecting head, wherein the first flange is connected to the transmission shaft via the first connecting edge, and an adjustment gap is reserved between the connecting head and the outer sleeve in a radial direction; At least three groups of first adjusting members, each group of first adjusting members having at least two members, the first adjusting members including an elastic block, a connecting bolt being provided on two sides of the elastic block away from each other, the studs of the two connecting bolts being arranged in directions away from each other, the first adjusting member being connected to the outer sleeve and the connecting head respectively through the two connecting bolts, The second adjusting portion is used to overcome the axial expansion and contraction force of the transmission shaft.

2. The connection structure for vibration testing of loaded products according to claim 1, characterized in that: A first accommodating groove for accommodating a portion of the elastic block is provided on the surface of the connector close to the outer sleeve, and a second accommodating groove for accommodating a portion of the elastic block is provided in the area of ​​the outer sleeve opposite to the first accommodating groove.

3. The connection structure for vibration testing of loaded products according to claim 2, characterized in that: A second mounting hole is provided on the wall of the outer sleeve and is recessed toward its axial center line. The second mounting hole is communicated with the second accommodating groove, and the inner diameter of the second mounting hole is larger than the aperture of the second accommodating groove. A stepped structure is formed between the bottom of the second mounting hole and the second accommodating groove. The stud portion of the connecting bolt of the first adjusting member is located in the second mounting hole. A baffle that can be sleeved on the connecting bolt is provided in the second mounting hole, and the baffle is abutted against the stepped structure at the bottom of the second mounting hole.

4. The connection structure for vibration testing of loaded products according to claim 1, characterized in that: The two connecting bolts of the first adjusting member and the elastic block are integrated into one piece.

5. The connection structure for vibration testing of loaded products according to claim 1, characterized in that: The number of the first adjusting members in each group is two, and the first adjusting members in each group are distributed in equal phases along the circumferential direction of the outer sleeve.

6. The connection structure for vibration testing of loaded products according to any one of claims 1 to 5, characterized in that: The second adjustment portion includes two groups of second adjustment members respectively arranged near two ends of the transmission shaft that are far away from each other. Each group of second adjustment members includes two U-shaped springs with openings arranged opposite to each other. The diameter direction of the opening of the U-shaped spring is along the length direction of the transmission shaft, and the length direction of the U-shaped spring is perpendicular to the axial direction of the transmission shaft.

7. The connection structure for vibration testing of loaded products according to claim 6, characterized in that: The two groups of second adjusting members arranged at two ends close to the transmission shaft and away from each other are staggered at 90 degrees.

8. The connection structure for vibration testing of loaded products according to claim 7, characterized in that: A connecting plate for fixing the U-shaped spring is respectively provided on the two outer sides of the U-shaped spring. When the connection structure for vibration testing of loaded products has a first adjustment portion and a second adjustment portion, two sets of the first adjustment portions are connected to two ends of the transmission shaft, and two sets of connecting plates of the second adjustment portions are respectively provided on a side of the first adjustment portion away from the transmission shaft; When the connection structure for vibration testing of loaded products only has the second adjustment portion, the connection plate of the second adjustment portion is connected to the transmission shaft.

9. A vibration testing system, characterized in that: The invention comprises a connection structure for vibration testing of loaded products according to any one of claims 1 to 8.

10. The vibration testing system according to claim 9, characterized in that: It also includes an output shaft connected to the transmission shaft through the first adjustment part and / or the second adjustment part, a driving gear is provided on the output shaft, and a driven gear is coaxially provided on the input shaft of the product to be tested, and the tooth diameter of the driving gear is larger than the tooth diameter of the driven gear.

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