High-efficiency testing device for central bolt

Abstract

The utility model provides a central bolt high-efficiency testing device, which relates to the field of central bolts and comprises a feeding frame, a transfer frame and a testing frame. The transfer frame is connected with a clamping assembly; a transfer station of the test frame is provided with a positioning base, the positioning base is provided with a test cavity, the positioning base is provided with an air outlet channel corresponding to an oil outlet of a central bolt, the test frame is further provided with a driving assembly used for driving the positioning base to move, and the test frame is provided with an upper pressing plate and an upper driving cylinder. An upper air inlet pipe communicated with a top oil inlet of the central bolt is arranged on the upper pressing plate; the testing frame is further provided with a flow sensor used for monitoring the flow in the central bolt. According to the high-efficiency testing device for the central bolt, an oil way is replaced by air flow, product flow performance detection is achieved, and an air source is neater and more environmentally friendly.

Description

Technical Field

[0001] The utility model relates to the technical field of central bolts, in particular to a high-efficiency testing device for central bolts. Background Art

[0002] The central bolt is installed in the engine timing system and plays the role of controlling the direction of the oil circuit. An oil channel is arranged in the central bolt, and a sleeve, a one-way valve, a filter and a spring are arranged on the oil channel. The spring is used to make the one-way valve press against the filter so that the one-way valve can play the role of one-way flow. In simple terms, the opening and direction of the oil circuit are adjusted through the movement of the valve core, so that the engine can obtain better fuel performance.

[0003] At present, after the central bolt is assembled, it needs to go through multiple testing processes for performance testing, which mainly includes internal flow testing, valve core stroke testing, and valve core movement friction testing. In the existing technology, different tooling equipment is generally used for separate testing of the above different performance tests, which has low testing efficiency; in addition, the flow test is traditionally carried out using an oil circuit test bench. Although it can accurately simulate the operating conditions of the engine, medium oil needs to be introduced into the oil circuit test, which not only has a long test cycle, but also does not meet environmental protection requirements and has pollution problems. In addition, the existing test process requires long-term manual intervention, resulting in waste of manual resources and increased costs. Utility Model Content

[0004] In order to overcome at least one defect in the above prior art, the utility model provides a central bolt high-efficiency testing device with a simple structure. The device replaces the oil circuit with air flow to achieve product flow performance testing, and the air source is cleaner and more environmentally friendly.

[0005] The utility model provides a high-efficiency testing device for a central bolt: it comprises a loading rack, a transfer rack and a test rack, the loading rack being slidably connected with a transfer tray for carrying the central bolt; the transfer rack being connected with a clamping assembly for transferring the central bolt; the transfer station of the test rack is provided with a positioning base, the positioning base is provided with a test cavity for the central bolt to be inserted and matched, the positioning base is provided with an air outlet channel connected to the test cavity and corresponding to the oil outlet of the central bolt, the test rack is also provided with a driving assembly for driving the positioning base to reciprocate between the transfer station and the test station, and an upper pressure plate for pressing the central bolt and an upper driving cylinder for driving the central bolt to rise and fall are provided at a position corresponding to the test station on the test rack, the upper pressure plate is provided with an upper air inlet pipe connected with the top oil inlet of the central bolt; the test rack is also provided with a flow sensor connected with the air outlet channel to realize internal flow monitoring of the central bolt.

[0006] Compared with the prior art, the central bolt high-efficiency testing device of the utility model has the following advantages:

[0007] In the central bolt high-efficiency testing device of the utility model, the original oil circuit test is replaced by the air circuit test. Compared with the traditional medium oil, the compressed air as the medium is cleaner and more environmentally friendly. In addition, during the entire testing process, the central bolt from loading to clamping, testing and unloading and transportation are all automated through mechanical settings. No human intervention is required in the intermediate process, which is safe and reliable, and the testing efficiency is high.

[0008] As an improvement, the lower end surface of the upper pressure plate is connected with a first clamping ring for clamping the central bolt housing, and a first channel is opened in the middle of the first clamping ring; a vertically arranged linear slide module is connected to the upper pressure plate, and a fixed plate is connected to the slider of the linear slide module, and a vertically arranged upper air intake pipe is connected to the fixed plate, and the lower end of the upper air intake pipe is slidably arranged in the first channel. In the above improved structure, the central bolt housing is first clamped by the first clamping ring, and then the upper air intake pipe is driven to dock with the top oil inlet of the central bolt by the linear slide module, so as to ensure that the central bolt will not be displaced during the test process and improve the test accuracy.

[0009] As a further improvement, a second clamping ring is further provided on the lower end face of the upper pressure plate, and the second clamping ring and the first clamping ring are arranged in a straight line along the moving direction of the positioning base, a second channel is opened in the middle of the second clamping ring, and a pressure rod for driving the valve stem of the central bolt to rise and shrink, a displacement sensor for monitoring the vertical displacement of the pressure rod, and a force sensor for monitoring the friction force of the valve stem movement are also provided on the fixed plate, and when the fixed plate descends until the force sensor detects that the lower end face of the pressure rod begins to abut against the valve stem of the central bolt, the displacement sensor is set to zero position. In the above improved structure, in addition to the first clamping ring, a second clamping ring is added, and a pressure rod is inserted into the second clamping ring, and the central bolt valve core is pushed to be compressed by the pressure rod, and the stroke detection of the valve core and the friction force detection during the movement of the valve core are realized by combining the displacement sensor and the force sensor, and the airflow, stroke and friction force detection are completed simultaneously by one device, saving costs and improving efficiency.

[0010] Further improvement, the lower end of the positioning base is connected to a vertical push rod, the upper end of the vertical push rod is slidably and sealingly inserted into the lower end of the test cavity, and the middle part of the vertical push rod is provided with a lower air inlet pipe connected to the top and bottom oil inlets of the central bolt; the test frame is also provided with a lower driving cylinder, and the piston rod of the lower driving cylinder is connected with an air supply pipe; when the positioning base is moved to the test station and the first clamping ring or the second clamping ring is clamped and limited at the top of the central bolt, the lower driving cylinder is used to drive the air supply pipe to rise, thereby driving the lower air inlet pipe together with the vertical push rod to rise until the upper end surface of the lower air inlet pipe abuts and seals against the bottom of the central bolt, and the inner cavity of the lower air inlet pipe is connected to the bottom oil inlet of the central bolt. In the above-mentioned improved structure, a liftable vertical push rod and a lower air inlet pipe are arranged under the positioning base, so that the test fixture can simultaneously detect two different types of central bolts, one with the oil inlet at the top and the other with the oil inlet at the bottom. There is no need to perform detection through two separate devices, which saves testing costs and effectively improves detection efficiency.

[0011] In a further improvement, a circular positioning ring is provided at the lower end of the vertical push rod, and a plurality of connecting bolts distributed along the circumferential direction are passed through the positioning ring from bottom to top, and the upper end of each connecting bolt is connected to the positioning base, and an elastic member is provided between the lower end surface of the positioning base and the upper end surface of the positioning ring. In the above improved structure, the elastic member is provided so that when the lower air intake pipe moves upward and drives the vertical push rod to move, there is an elastic buffer to avoid damage to the product caused by hard contact.

[0012] Preferably, the elastic member includes a plurality of springs, and each of the springs is respectively sleeved on the outside of a plurality of connecting bolts, and the upper and lower ends of each spring are respectively in contact with the lower end surface of the positioning base and the upper end surface of the positioning ring. In this structure, the spring is selected as the elastic member, which has a simple structure, is easy to install, and has low cost.

[0013] As a further improvement, a rotating cylinder is connected to the transfer frame, and two symmetrical rotating arms are connected to the power output end of the rotating cylinder. Both rotating arms are connected to finger cylinders for clamping the central bolts on the loading station and the transfer station respectively.

[0014] Further improved, the lower end of the loading rack is provided with a lifting cylinder at a position corresponding to the loading station, the free end of the lifting cylinder is connected to a positioning block, the positioning block is provided with a positioning pin protruding outward, and the lower end of the transfer tray is provided with a positioning groove for accommodating the positioning block and a positioning hole for inserting and positioning the positioning pin. In the above improved structure, after the positioning structure at the lower end of the loading rack is set, the stability of the transfer tray at the loading station is effectively guaranteed, that is, the central bolt is accurately located at the set position, so that the clamped component can be better clamped and transferred quickly and smoothly.

[0015] Further improved, the driving assembly includes a transverse driving cylinder horizontally arranged on the test frame, the free end of the transverse driving cylinder is connected to the positioning base, and the test frame is also provided with two mutually parallel linear slide rails, and the positioning base is slidably connected to the linear slide rails through a slider.

[0016] As a further improvement, the test stand is also provided with two groups of travel switches for respectively limiting the movement limit positions of the positioning base.

[0017] Other improved features and advantages of the utility model will be described in the subsequent specific embodiments, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be achieved and obtained through the structures specifically pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural diagram of the central bolt high-efficiency testing device of the utility model;

[0019] Figure 2 This is a front view of the central bolt high-efficiency testing device of the utility model;

[0020] Figure 3 This is a transverse cross-sectional view of the central bolt high-efficiency testing device of the utility model along the positioning base;

[0021] Figure 4 This is another angled cross-sectional view of the central bolt high-efficiency testing device of the utility model. (Removing the loading rack)

[0022] Description of reference numerals:

[0023] 1. Loading rack; 2. Transfer rack; 3. Test rack; 4. Transfer tray; 5. Positioning base; 6. Test chamber; 7. Upper pressure plate; 8. Upper drive cylinder; 9. Upper air inlet pipe; 10. First clamping ring; 11. Linear slide module; 12. Fixed plate; 13. Second clamping ring; 14. Pressure rod; 15. Displacement sensor; 16. Vertical push rod; 17. Lower air inlet pipe; 18. Lower drive cylinder; 19. Air supply pipe; 20. Positioning ring; 21. Connecting bolt; 22. Elastic part; 23. Rotating cylinder; 24. Finger cylinder; 25. Lifting cylinder; 26. Positioning pin; 27. Transverse drive cylinder; 28. Travel switch. DETAILED DESCRIPTION

[0024] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0025] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "fixed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0026] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] See also Figure 1 to Figure 4 As shown, an embodiment of the present application discloses a high-efficiency central bolt testing device, including a loading rack 1, a transfer rack 2 and a testing rack 3, wherein the loading rack 1 is slidably connected with a transfer tray 4 for carrying the central bolt. Specifically, the loading rack 1 is a link in the loading line, which is used to continuously move the central bolts to be tested one by one to the loading station through the transfer tray 4, and at the same time, transfer the central bolts that have been tested to the next link.

[0028] In addition, a clamping assembly for transferring the central bolt is connected to the transfer frame 2, which is used to clamp and transfer the central bolt on the loading station to one side of the test frame 3. Specifically, a positioning base 5 is provided at the transfer station of the test frame 3, and a test cavity 6 for the central bolt to be inserted and matched is provided on the positioning base 5. More specifically, in the above structure, an air outlet channel connected to the test cavity 6 and corresponding to the oil outlet of the central bolt is opened on the positioning base 5, and a driving assembly for driving the positioning base 5 to reciprocate between the transfer station and the test station is also provided on the test frame 3, and an upper pressure plate 7 for tightening the central bolt and an upper driving cylinder 8 for driving it to rise and fall are provided at a position corresponding to the test station on the test frame, and an upper air inlet pipe 9 connected to the top oil inlet of the central bolt is provided on the upper pressure plate 7; a flow sensor connected to the air outlet channel to realize internal flow monitoring of the central bolt is also provided on the test frame 3.

[0029] The entire testing process is roughly as follows:

[0030] First, the transfer pallet 4 carrying the central bolt moves to the loading station, the clamping assembly is used to transfer the central bolt to be tested to the positioning base 5, the driving assembly drives the positioning base 5 to move to the testing station, the upper driving cylinder 8 drives the upper pressure plate 7 to press and limit the top of the central bolt to realize product positioning, and the upper air inlet pipe 9 is connected to the oil inlet at the top of the central bolt, and the external air source ventilates the upper air inlet pipe 9, and the internal flow of the central bolt is monitored by the flow sensor, and the test results are compared with the design standards to determine whether the product is qualified. When the test is completed, the clamping assembly continues to clamp the central bolt on the positioning base 5 and transfer it to the shipping pallet. If the product test is qualified, the shipping pallet continues to flow backward to the qualified product channel. If the product test is unqualified, the shipping pallet continues to flow backward to the unqualified product channel; in this process, the first transfer pallet 4 can flow backward first when the central bolt is clamped and moved to the positioning base 5, and starting from the second transfer pallet 4, the central bolt of the previous test can be interchanged with the central bolt on the next transfer pallet 4 to improve the efficiency of automated circulation.

[0031] In this embodiment, the lower end face of the upper pressure plate 7 is connected with a first clamping ring 10 for clamping the central bolt housing, a first channel is opened in the middle of the first clamping ring 10, and a sealing ring is installed on the lower end face of the first clamping ring 10; the upper pressure plate 7 is connected with a vertically arranged linear slide module 11, the slider of the linear slide module 11 is connected with a fixed plate 12, the fixed plate 12 is connected with a vertically arranged upper air intake pipe 9, and the lower end of the upper air intake pipe 9 is slidably passed through the first channel. During inspection, the positioning base 5 moves to the test station, and the upper pressure plate 7 moves downward until the first clamping ring 10 is tightly sealed on the upper end face of the central bolt, and the slider moves downward to drive the upper air intake pipe 9 to move downward until its lower end face abuts against and is connected to the oil inlet at the upper end of the central bolt.

[0032] In addition, a second clamping ring 13 is provided on the lower end surface of the upper pressure plate 7, and the second clamping ring 13 and the first clamping ring 10 are arranged in a straight line along the moving direction of the positioning base 5, and a second channel is opened in the middle of the second clamping ring 13. The fixed plate 12 is also provided with a pressure rod 14 for driving the valve stem of the central bolt to extend and retract, a displacement sensor 15 for monitoring the vertical displacement of the pressure rod 14, and a force sensor for monitoring the friction force of the valve stem movement; when testing, this structure can not only detect the internal flow condition of the central bolt, but also realize the valve core movement stroke detection and the friction force condition during the valve core movement process. Specifically, the above-mentioned test station includes two test points, one for testing the flow rate, recorded as the first test point, and the other for testing the stroke and friction force, recorded as the second test point, and the two test points are switched by driving the positioning base 5 to move through the driving component. The flow test has been described in the previous article and will not be repeated here. Here, a second test point is taken as an example for explanation. That is, when the positioning base 5 moves to the second test point, the upper drive cylinder 8 drives the upper pressure plate 7 downward until the second clamping ring 13 is clamped and limited on the upper end face of the central bolt. Then the linear slide module 11 runs, driving the fixed plate 12 to move downward until the force sensor senses that the pressure rod 14 is in contact with the valve core. The displacement sensor 15 is set to zero position, and then the pressure rod 14 continues to move downward until the valve core moves to the extreme position and no longer moves. At this time, the value of the displacement sensor 15 is the stroke of the valve core. At the same time, the force sensor can detect the friction during the movement of the valve core.

[0033] In the present embodiment, more specifically, a vertical push rod 16 is also connected to the lower end of the positioning base 5, and the upper end of the vertical push rod 16 is slidably and sealedly penetrated into the lower end of the test cavity 6, and a lower air inlet pipe 17 connected to the top and bottom oil inlets of the central bolt is provided in the middle part of the vertical push rod 16; a lower driving cylinder 18 is also provided on the test frame 3, and an air supply pipe 19 is connected to the piston rod of the lower driving cylinder 18; when the positioning base 5 moves to the test station (the first test point), and the first clamping ring 10 or the second clamping ring 13 is clamped and limited at the top of the central bolt, the lower driving cylinder 18 is used to drive the air supply pipe 19 to rise, driving the lower air inlet pipe 17 together with the vertical push rod 16 to rise until the upper end surface of the lower air inlet pipe 17 abuts and seals against the bottom of the central bolt, and the inner cavity of the lower air inlet pipe 17 is connected to the bottom oil inlet of the central bolt. After this structure is set up, the test fixture can simultaneously detect two different types of central bolts, one with the oil inlet at the top and the other with the oil inlet at the bottom. There is no need to use two separate devices for detection, which saves test costs and effectively improves detection efficiency.

[0034] A circular positioning ring 20 is provided at the lower end of the vertical push rod 16, and a plurality of connecting bolts 21 distributed in the circumferential direction are passed through the positioning ring 20 from bottom to top. The upper end of each connecting bolt 21 is connected to the positioning base 5, and an elastic member 22 is provided between the lower end surface of the positioning base 5 and the upper end surface of the positioning ring 20. Preferably, the elastic member 22 includes a plurality of springs, and each spring is respectively sleeved on the outside of the plurality of connecting bolts 21, and the upper and lower ends of each spring are respectively abutted against the lower end surface of the positioning base 5 and the upper end surface of the positioning ring 20. In this structure, the elastic member 22 is provided so that when the lower air intake pipe 17 moves upward to drive the vertical push rod 16 to move, there is an elastic buffer to avoid damage to the product due to hard contact; and a sealing ring is also provided at the top of the lower air intake pipe 17.

[0035] In this embodiment, a rotating cylinder 23 is connected to the transfer frame 2, and two symmetrical rotating arms are connected to the power output end of the rotating cylinder 23. Both rotating arms are connected to finger cylinders 24 for clamping the central bolts on the loading station and the transfer station respectively.

[0036] On the other hand, in order to ensure that the transfer tray 4 is stably limited at the loading station, a lifting cylinder 25 is provided at the lower end of the loading rack 1 at a position corresponding to the loading station. The free end of the lifting cylinder 25 is connected to a positioning block and a positioning pin 26. The lower end of the transfer tray is provided with a positioning groove for accommodating the positioning block and a positioning hole for inserting and positioning the positioning pin 26.

[0037] The driving assembly includes a transverse driving cylinder 27 horizontally arranged on the test frame 3, the free end of the transverse driving cylinder 27 is connected to the positioning base 5, and two parallel linear slide rails are also arranged on the test frame 3, and the positioning base 5 is slidably connected to the linear slide rails through a slider.

[0038] The test stand 3 is also provided with two sets of travel switches 28 for respectively limiting the movement limit positions of the positioning base 5, so as to ensure that the positioning base 5 can accurately move to the transfer station and the test station when moving. In addition, there are two travel switches 28 corresponding to the test station, which are respectively used to locate the first test point and the second test point.

[0039] In the description of the present application, the description with reference to the terms "present embodiment", "some embodiments", etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradicting each other.

[0040] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A central bolt high-efficiency testing device, characterized in that: The invention comprises a loading rack (1), a transfer rack (2) and a test rack (3), wherein the loading rack (1) is slidably connected with a transfer tray (4) for carrying a central bolt; the transfer rack (2) is connected with a clamping assembly for transferring the central bolt; the transfer station of the test rack (3) is provided with a positioning base (5), the positioning base (5) is provided with a test cavity (6) for the central bolt to be inserted and matched, the positioning base (5) is provided with an air outlet channel connected to the test cavity (6) and corresponding to the oil outlet of the central bolt, and the The test frame (3) is also provided with a driving assembly for driving the positioning base (5) to reciprocate between the transfer station and the test station, and an upper pressure plate (7) for pressing the central bolt and an upper driving cylinder (8) for driving the central bolt to rise and fall are provided at a position corresponding to the test station on the test frame, and an upper air inlet pipe (9) connected to the top oil inlet of the central bolt is provided on the upper pressure plate (7); the test frame (3) is also provided with a flow sensor connected to the air outlet channel to realize internal flow monitoring of the central bolt.

2. The central bolt high-efficiency testing device according to claim 1, characterized in that: The lower end surface of the upper pressure plate (7) is connected to a first clamping ring (10) for clamping the central bolt housing, and a first channel is opened in the middle of the first clamping ring (10); the upper pressure plate (7) is connected to a vertically arranged linear slide module (11), the slider of the linear slide module (11) is connected to a fixed plate (12), the fixed plate (12) is connected to a vertically arranged upper air intake pipe (9), and the lower end of the upper air intake pipe (9) is slidably arranged in the first channel.

3. The central bolt high-efficiency testing device according to claim 2, characterized in that: The lower end surface of the upper pressure plate (7) is also provided with a second clamping ring (13), and the second clamping ring (13) and the first clamping ring (10) are arranged in a straight line along the moving direction of the positioning base (5), and a second channel is opened in the middle of the second clamping ring (13). The fixed plate (12) is also provided with a pressure rod (14) for driving the valve stem of the central bolt to extend and retract, a displacement sensor (15) for monitoring the vertical displacement of the pressure rod (14), and a force sensor for monitoring the friction force of the valve stem movement, and when the fixed plate (12) moves downward until the force sensor detects that the lower end surface of the pressure rod (14) begins to abut against the valve stem of the central bolt, the displacement sensor (15) is set to zero position.

4. The central bolt high-efficiency testing device according to claim 2 or 3, characterized in that: The lower end of the positioning base (5) is connected to a vertical push rod (16), the upper end of the vertical push rod (16) is slidably and sealingly inserted into the lower end of the test chamber (6), and the middle part of the vertical push rod (16) is provided with a lower air inlet pipe (17) which is connected to the top and bottom oil inlets of the central bolt; the test frame (3) is also provided with a lower drive cylinder (18), and the piston rod of the lower drive cylinder (18) is connected to an air supply pipe (19); when the positioning When the base (5) moves to the test station and the first clamping ring (10) or the second clamping ring (13) is clamped and limited at the top of the central bolt, the lower driving cylinder (18) is used to drive the air supply pipe (19) to rise, driving the lower air inlet pipe (17) together with the vertical push rod (16) to rise until the upper end surface of the lower air inlet pipe (17) is abutted and sealed against the bottom of the central bolt, and the inner cavity of the lower air inlet pipe (17) is connected to the oil inlet at the bottom of the central bolt.

5. The central bolt high-efficiency testing device according to claim 4, characterized in that: A circular positioning ring (20) is provided at the lower end of the vertical push rod (16), and a plurality of connecting bolts (21) distributed along the circumferential direction are passed through the positioning ring (20) from bottom to top, and the upper end of each connecting bolt (21) is connected to the positioning base (5), and an elastic member (22) is provided between the lower end surface of the positioning base (5) and the upper end surface of the positioning ring (20).

6. The central bolt high-efficiency testing device according to claim 5, characterized in that: The elastic member (22) comprises a plurality of springs, and each of the springs is respectively sleeved on the outside of a plurality of connecting bolts (21), and the upper and lower ends of each spring are respectively in contact with the lower end surface of the positioning base (5) and the upper end surface of the positioning ring (20).

7. The central bolt high-efficiency testing device according to claim 1, characterized in that: The transfer frame (2) is connected to a rotary cylinder (23), and the power output end of the rotary cylinder (23) is connected to two symmetrical rotary arms, and the two rotary arms are both connected to finger cylinders (24) for clamping the central bolts on the loading station and the transfer station respectively.

8. The central bolt high-efficiency testing device according to claim 1 or 7, characterized in that: A lifting cylinder (25) is provided at the lower end of the loading rack (1) at a position corresponding to the loading station, and a positioning block and a positioning pin (26) are connected to the free end of the lifting cylinder (25). A positioning groove for accommodating the positioning block and a positioning hole for inserting and positioning the positioning pin (26) are provided at the lower end of the transfer plate.

9. The central bolt high-efficiency testing device according to claim 1, characterized in that: The driving assembly comprises a transverse driving cylinder (27) horizontally arranged on the test frame (3), the free end of the transverse driving cylinder (27) is connected to the positioning base (5), and two mutually parallel linear slide rails are also arranged on the test frame (3), and the positioning base (5) is slidably connected to the linear slide rails via a slider.

10. The central bolt high-efficiency testing device according to claim 9, characterized in that: The test stand (3) is also provided with two groups of travel switches (28) for respectively limiting the movement limit positions of the positioning base (5).

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