Generator set lubricating oil viscosity on-line detection device

Abstract

The present application relates to the technical fields of viscosity determination, in particular to a kind of online detection device for generator set lubricating oil viscosity, it includes the mounting frame, wherein the outer wall of the mounting frame is provided with detection device and limiting device;The top plate of the mounting frame is fixedly installed with fixed frame, the fixed frame is opened with guide slot, the sliding rod is slidably installed in the guide slot, the circumferential surface of the sliding rod is rotatably installed with carbon fiber plate, the outer wall of the carbon fiber plate is fixedly installed with heat insulation plate, the outer wall of the fixed frame is rotatably installed with support roller, the outer wall of the mounting frame is fixedly installed with support plate, the outer wall of the mounting frame is fixedly installed with bracket fixed plate, by flexibly adjusting the parallel position and angle of carbon fiber plate, lubricating oil sample can be conveniently and quickly recovered, and carbon fiber plate can be quickly put into next round test, so as to improve the overall efficiency of lubricating oil viscosity test.

Description

Technical Field

[0001] This invention relates to the field of viscosity measurement technology, and more specifically, to an online viscosity detection device for generator set lubricating oil. Background Technology

[0002] The generator set lubricating oil viscosity online detection device is a device that can monitor the changes in the viscosity of generator set lubricating oil in real time. By continuously monitoring the viscosity of lubricating oil, it can promptly reflect the deterioration, contamination or performance degradation of the oil, providing key data support for the safe operation and maintenance of generator sets.

[0003] A search revealed a modified asphalt coating viscosity testing device according to CN211978603U, which includes a leakage cup, a receiving cup located below the leakage cup, and a timer. The leakage cup includes a cup body, a holding cup located within the cup body, and a thermometer located within the holding cup. The top of the holding cup has a feeding port, and the bottom of the holding cup has a discharge port. A control valve is provided at the discharge port to open or close the discharge port. An electric heating wire is provided between the holding cup and the cup body. This patent uses the relationship curve between the coating viscosity and the dripping weight at different temperatures as the viscosity judgment basis. By measuring the weight of the coating dripping over a certain period of time, the viscosity is determined. Compared with the traditional method of characterizing viscosity by dripping time, this method is more suitable for modified asphalt coatings with strong adhesion and easy cooling and wall adhesion, and has higher measurement accuracy.

[0004] The aforementioned patent can effectively improve the accuracy of viscosity measurement. However, in actual testing, in order to simulate the temperature conditions of real-world use scenarios, the lubricating oil sample needs to be heated. When the heated lubricating oil is tested through the filter cup, it is easy to adhere to the cup wall and bottom, forming stubborn residues. If the residues are not thoroughly cleaned, they will contaminate subsequent lubricating oil samples, forcing operators to spend a lot of time cleaning the residual lubricating oil in the filter cup, including physical scraping, solvent cleaning and drying, which seriously slows down the overall progress of multi-temperature gradient testing.

[0005] Based on this, the present invention discloses an online detection device for lubricating oil viscosity of generator sets. Summary of the Invention

[0006] To address the problem mentioned in the background art that lubricating oil is difficult to clean after viscosity testing, the present invention provides an online lubricating oil viscosity detection device for generator sets, which includes a mounting frame, wherein the outer wall of the mounting frame is provided with a detection device and a limiting device;

[0007] In this proposed solution, to facilitate the cleaning of residual lubricating oil samples, it is necessary to change the testing environment to a closed one.

[0008] As a further improvement to this technical solution, a fixed frame is fixedly installed on the top plate of the mounting frame. A guide groove is provided on the fixed frame, and a sliding rod is slidably installed in the guide groove. A carbon fiber plate is rotatably installed on the circumferential surface of the sliding rod. A heat insulation plate is fixedly installed on the outer wall of the carbon fiber plate. A support roller is rotatably installed on the outer wall of the fixed frame. A support plate is fixedly installed on the outer wall of the mounting frame. A bracket fixing plate is fixedly installed on the outer wall of the mounting frame. A temperature sensor is provided on the top of the fixed frame. The temperature sensor is used to monitor the temperature of the carbon fiber plate in real time.

[0009] Based on this, in order to collect the flow efficiency of lubricating oil samples at different temperatures, the entire testing process needs to be recorded.

[0010] As a further improvement to this technical solution, a loading frame is fixedly installed on the top of the fixed frame, and a heating device is fixedly installed on the bottom of the loading frame. The heating device irradiates the lubricating oil sample in area A.

[0011] In another scenario, because the carbon fiber plate can be flexibly adjusted, excessive movement of the plate by the tester during lubricant application could cause it to accidentally detach from the support roller and collide, compromising its safety. Therefore, safety restrictions need to be placed on the movement of the carbon fiber plate.

[0012] As a further improvement to this technical solution, the limiting device includes a frame, which is fixedly installed on the top of the mounting frame. An elastic telescopic rod is fixedly installed on the inner wall of the frame, and an L-shaped plate is fixedly installed on the telescopic end of the elastic telescopic rod. An elastic sheet is provided on the side of the L-shaped plate away from the elastic telescopic rod.

[0013] To allow for flexible adjustment of the L-shaped plate's position so that it does not obstruct the carbon fiber plate during rotation,

[0014] As a further improvement to this technical solution, a limiting block is fixedly installed on the top of the frame, a rectangular plate is fixedly installed on the top of the L-shaped plate, a pin is slidably passed through the top of the rectangular plate, a groove is provided on the side of the limiting block near the elastic telescopic rod, a round hole is provided on the top of the limiting block, and the pin contacts the inner wall of the round hole.

[0015] In another approach, carbon fiber plates, due to their low thermal conductivity, light weight, and high hardness, are excellent carriers for applying lubricating oil samples. However, the tester needs to concentrate while rotating the carbon fiber plate to ensure it contacts the support plate, minimizing impact during adjustment. To achieve stable contact of the carbon fiber plate...

[0016] As a further improvement to this technical solution, the speed reduction device includes a tripod and a hollow cylinder. The tripod is fixedly installed on the outer wall of the support plate, and the hollow cylinder is fixedly installed on the inner wall of the tripod. A round rod slides through the top of the hollow cylinder, a top plate is fixedly installed on the top of the round rod, and a pressure plate is fixedly installed on the bottom of the round rod. A spring is provided on the pressure plate between the pressure plate and the hollow cylinder. The pressure plate is slidably connected to the hollow cylinder through the spring. Tap water is provided inside the hollow cylinder, and several through holes are opened on the surface of the pressure plate.

[0017] To ensure that the round rod does not deviate during movement, it is necessary to enhance the smoothness of the round rod's movement.

[0018] As a further improvement to this technical solution, a connecting rod is fixedly installed on the circumferential surface of the round rod, and the connecting rod contacts the inner wall of the movable groove.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. In this online lubricating oil viscosity testing device for generator sets, a heat insulation plate naturally divides the coating area into two test areas, A and B. By using a carbon fiber plate as a carrier for the lubricating oil sample, the temperature difference between the lubricating oil samples in area A and area B becomes significant, making it easy for testers to compare the performance differences of lubricating oil samples at room temperature and high temperature. At the same time, a scraper is used to gently scrape along the inclined surface of the carbon fiber plate to ensure that the residual lubricating oil sample is completely recovered. By flexibly adjusting the parallel position and angle of the carbon fiber plate, the lubricating oil sample can be recovered conveniently and quickly, and the carbon fiber plate can be quickly put into the next round of testing, thereby improving the overall efficiency of lubricating oil viscosity testing.

[0021] 2. In this online lubricating oil viscosity testing device for generator sets, the elastic sheet reduces the impact force generated when the carbon fiber plate contacts the L-shaped plate. Through the synergistic effect of the L-shaped plate and the elastic sheet, the movement range of the carbon fiber plate can be precisely limited, ensuring a smoother stopping process. At the same time, the pin contacts the groove of the limiting block, re-locking the position of the rectangular plate. Through the cooperation of the pin and the limiting block, the tester can quickly adjust the position of the L-shaped plate, ensuring that the adjustment process of the carbon fiber plate meets the test requirements.

[0022] 3. In this online lubricating oil viscosity testing device for generator sets, the elastic resistance of the spring and the resistance of the tap water work together to gradually reduce the descent speed of the carbon fiber plate. This achieves double buffering through the spring and tap water, effectively reducing the impact and vibration when the carbon fiber plate contacts the top plate, preventing the lubricating oil sample from shifting due to vibration and affecting the accuracy of the test results. At the same time, the connecting rod transmits the supporting force to the round rod, enhancing the straightness and stability of the round rod's axial movement. By setting the connecting rod, the cooperation between the connecting rod and the support plate ensures that the round rod moves strictly along the axial direction, avoiding skewing or swinging, and ensuring a stable testing environment. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the fixing frame and loading rack structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the carbon fiber plate and support roller structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the internal structure of the fixed frame of the present invention;

[0027] Figure 5 This is a schematic diagram of the heating device structure of the present invention;

[0028] Figure 6 This is a schematic diagram of the heat insulation panel structure of the present invention;

[0029] Figure 7 This is a schematic diagram of the limiting device structure of the present invention;

[0030] Figure 8 This is a schematic diagram of the limiting block and pin structure of the present invention;

[0031] Figure 9 This is a schematic diagram of the support plate and connecting rod structure of the present invention;

[0032] Figure 10 This is a schematic diagram of the internal structure of the speed reduction device of the present invention.

[0033] The meanings of the labels in the diagram are as follows:

[0034] 1. Mounting frame;

[0035] 21. Fixed frame; 22. Sliding rod; 23. Carbon fiber plate; 24. Heat insulation plate; 25. Support roller; 26. Support plate; 27. Loading rack; 28. Heating device;

[0036] 31. Bracket mounting plate; 32. Temperature sensor;

[0037] 41. Frame; 42. Elastic telescopic rod; 43. L-shaped plate; 44. Elastic sheet; 45. Limiting block; 46. Rectangular plate; 47. Pin;

[0038] 51. Tripod; 52. Hollow cylinder; 53. Round rod; 54. Top plate; 55. Pressure plate; 56. Spring; 57. Connecting rod. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In existing lubricating oil viscosity tests, it is usually necessary to put the lubricating oil sample into a container and heat it to ensure the stability of temperature control. However, this closed testing environment presents significant cleaning challenges.

[0041] Therefore, this invention provides an online detection device for generator set lubricating oil viscosity. See [link to related document]. Figures 1-6 As shown, it includes a mounting frame 1, wherein the outer wall of the mounting frame 1 is provided with a detection device and a limiting device. The detection device includes: a fixed frame 21, which is fixedly installed on the top of the mounting frame 1, and a guide groove is opened on the surface of the fixed frame 21; a sliding rod 22, which is slidably installed in the guide groove of the fixed frame 21; a carbon fiber plate 23, which is rotatably installed on the circumferential surface of the sliding rod 22; a heat insulation plate 24, which is fixedly installed on the outer wall of the carbon fiber plate 23; a support roller 25, which is rotatably installed on the outer wall of the fixed frame 21 and contacts the bottom of the carbon fiber plate 23; a support plate 26, which is fixedly installed on the outer wall of the mounting frame 1; and a bracket fixing plate 31 is fixedly installed on the outer wall of the mounting frame 1. The bracket fixing plate 31 is used to fix the camera equipment. A temperature sensor 32 is provided on the top of the fixed frame 21. The temperature sensor 32 is used to monitor the temperature of the carbon fiber plate 23 in real time.

[0042] During operation, the carbon fiber plate 23 is manually and horizontally pulled out, allowing it to move smoothly towards the support plate 26. The movement of the carbon fiber plate 23 causes the sliding rod 22 to move synchronously. During this process, the bottom surface of the carbon fiber plate 23 rubs against the support roller 25, causing the support roller 25 to rotate and reducing frictional resistance during the movement of the carbon fiber plate 23. Once the carbon fiber plate 23 reaches the designated position and stops moving, the lubricating oil sample is evenly coated onto its surface using a scraper. The heat insulation plate 24 naturally divides the coating area into two test areas, A and B. After coating is complete, the carbon fiber plate 23 is pushed back to its initial position, and the sliding rod 22 resets accordingly. The heating device 28 is activated to evenly heat the lubricating oil sample in area A. Simultaneously, the temperature sensor 32 on the fixed frame 21 monitors the surface temperature of the lubricating oil samples in areas A and B in real time. The data is wirelessly transmitted to the monitoring terminal. By using the carbon fiber plate 23 as the carrier for the lubricating oil sample, the temperature difference between areas A and B becomes significant, facilitating comparison of the performance differences of the lubricating oil samples at room temperature and high temperature.

[0043] For details, see Figures 1-6 As shown, since the carbon fiber plate 23 in the parallel state cannot guide the lubricating oil sample to flow well, the lubricating oil viscosity test time is prolonged. Therefore, it is necessary to adjust the angle of the carbon fiber plate 23 while ensuring the stability after adjustment. The top of the fixed frame 21 is fixedly installed with a loading rack 27, and the bottom of the loading rack 27 is fixedly installed with a heating device 28.

[0044] The side wall of the support plate 26 is provided with a movable groove, the top of the support plate 26 is set as an inclined surface, and a rectangular groove is provided on the inclined surface of the support plate 26. A speed reduction device is provided on the support plate 26.

[0045] A shim is provided on the circumferential surface of the sliding rod 22. The shim contacts the outer wall of the fixed frame 21 and is used to restrict the axial movement of the sliding rod 22.

[0046] During operation, after the lubricating oil sample is heated, the receiving container is placed in the designated position, and the carbon fiber plate 23 is manually pulled out until it is completely detached from the support roller 25. At this point, the front end of the carbon fiber plate 23 loses support and is released from its horizontal locking state. The front end of the carbon fiber plate 23 is then rotated downwards to contact the inclined surface of the support plate 26, forming an inclined state. The inclined carbon fiber plate 23 uses gravity to accelerate the flow of the lubricating oil sample, which then slides naturally along the carbon fiber plate 23 and eventually detaches from it, falling into the recovery container below. Simultaneously, the camera on the bracket fixing plate 31 records the flow state of the lubricating oil sample throughout the process, capturing key data such as the flow rate for subsequent viscosity analysis. After the test, a scraper is used to gently scrape along the surface of the inclined carbon fiber plate 23 to ensure that any residual lubricating oil sample is completely recovered, preventing contamination of subsequent lubricating oil samples. By flexibly adjusting the parallel position and angle of the carbon fiber plate 23, the lubricating oil sample can be recovered conveniently and quickly, and the carbon fiber plate 23 can be quickly put into the next round of testing, thereby improving the overall efficiency of lubricating oil viscosity testing.

[0047] Further, see Figures 7-8 As shown, the limiting device includes a frame 41, which is fixedly installed on the top of the mounting frame 1. An elastic telescopic rod 42 is fixedly installed on the inner wall of the frame 41. An L-shaped plate 43 is fixedly installed on the telescopic end of the elastic telescopic rod 42. An elastic sheet 44 is provided on the side of the L-shaped plate 43 away from the elastic telescopic rod 42.

[0048] A limiting block 45 is fixedly installed on the top of the frame 41, and a rectangular plate 46 is fixedly installed on the top of the L-shaped plate 43. A pin 47 slides through the top of the rectangular plate 46. A groove is provided on the side of the limiting block 45 near the elastic telescopic rod 42, and a round hole is provided on the top of the limiting block 45. The pin 47 contacts the inner wall of the round hole.

[0049] During operation, when the carbon fiber plate 23 moves towards the frame 41, it comes into contact with the elastic sheet 44 on the L-shaped plate 43. During this contact, the continuous movement of the carbon fiber plate 23 applies pressure to the elastic sheet 44, causing it to elastically deform. The deformed elastic sheet 44 then exerts a counterforce on the carbon fiber plate 23, reducing the impact force generated when the carbon fiber plate 23 contacts the L-shaped plate 43. Subsequently, the L-shaped plate 43 firmly blocks the movement of the carbon fiber plate 23, preventing excessive displacement. Through the synergistic effect of the L-shaped plate 43 and the elastic sheet 44, the movement range of the carbon fiber plate 23 can be precisely limited, ensuring a smoother stopping process. When it is necessary to adjust the angle of the carbon fiber plate 23, the pin 47 is pulled upwards. This allows the rectangular plate 46 to disengage from the circular hole of the limiting block 45, thereby releasing the lock on the rectangular plate 46. The L-shaped plate 43 is then pushed towards the elastic telescopic rod 42, causing the rectangular plate 46 to move synchronously and compressing the telescopic end of the elastic telescopic rod 42 during this movement. The rectangular plate 46 then moves the pin 47 synchronously. When the rectangular plate 46 reaches the designated position, the pin 47 is pressed down, making it contact the groove of the limiting block 45, thus relocking the position of the rectangular plate 46. After adjustment, the carbon fiber plate 23 is no longer obstructed by the L-shaped plate 43 as it moves along the guide groove, allowing for free angle adjustment. Through the cooperation of the pin 47 and the limiting block 45, the tester can quickly adjust the position of the L-shaped plate 43, ensuring that the adjustment process of the carbon fiber plate 23 meets the test requirements.

[0050] Among them, see Figures 9-10 As shown, the speed reduction device includes a tripod 51 and a hollow cylinder 52. The tripod 51 is fixedly installed on the outer wall of the support plate 26, and the hollow cylinder 52 is fixedly installed on the inner wall of the tripod 51. A round rod 53 slides through the top of the hollow cylinder 52. A top plate 54 is fixedly installed on the top of the round rod 53, and a pressure plate 55 is fixedly installed on the bottom of the round rod 53. A spring 56 is provided on the pressure plate 55 between the pressure plate 55 and the hollow cylinder 52. The pressure plate 55 is slidably connected to the hollow cylinder 52 through the spring 56. Tap water is provided inside the hollow cylinder 52, and several through holes are opened on the surface of the pressure plate 55.

[0051] A connecting rod 57 is fixedly installed on the circumference of the round rod 53, and the connecting rod 57 is in contact with the inner wall of the movable groove.

[0052] During operation, when the carbon fiber plate 23 rotates downwards, its edge first contacts the top plate 54, pushing the top plate 54 downwards. The top plate 54 then moves the round rod 53 downwards simultaneously, which in turn moves the pressure plate 55 downwards. During this process, the pressure plate 55 compresses the spring 56 as it moves downwards. The deformed spring 56 exerts a continuous reaction force on the pressure plate 55, partially offsetting the downward pressure of the carbon fiber plate 23. Simultaneously, the pressure plate 55 squeezes the tap water inside the hollow cylinder 52, forcing the water to flow upwards through the through-holes on the pressure plate 55. The flow of water creates resistance, further slowing the downward speed of the pressure plate 55. The elastic resistance of the spring 56 and the resistance of the tap water work together to gradually reduce the descent speed of the carbon fiber plate 23, eventually bringing it into contact with the support plate 26 at a gentle speed. Through the dual buffering effect of the spring 56 and the tap water, the downward speed of the carbon fiber plate 23 is effectively reduced. The impact and vibration when in contact with the top plate 54 prevent the lubricating oil sample from shifting due to vibration, which would affect the accuracy of the test results. When the carbon fiber plate 23 rotates upward and disengages from the top plate 54, the spring 56 pushes the pressure plate 55 upward to reset due to the elastic restoring force, preparing for the next deceleration process. During this process, when the round rod 53 moves, it drives the connecting rod 57 connected to it to slide along the movable groove. The support plate 26 provides stable support for the connecting rod 57 through the movable groove, preventing the round rod 53 from deviating or shaking. The connecting rod 57 transmits the supporting force of the support plate 26 to the round rod 53, enhancing the straightness and smoothness of the round rod 53's axial movement and reducing the risk of vibration or jamming. By setting the connecting rod 57, the cooperation between the connecting rod 57 and the support plate 26 ensures that the round rod 53 moves strictly along the axial direction, avoiding skewness or swaying and ensuring a stable test environment.

[0053] In summary, this effectively solves the problem of existing lubricating oils being difficult to clean after viscosity testing.

[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An online detection device for lubricating oil viscosity of generator sets, comprising a mounting frame (1), characterized in that: in, The outer wall of the mounting frame (1) is provided with a detection device and a limiting device, the detection device comprising: A fixed frame (21) is fixedly installed on the top of the mounting frame (1), and a guide groove is provided on the surface of the fixed frame (21); A sliding rod (22) is slidably installed in a guide groove of a fixed frame (21); Carbon fiber plate (23), said carbon fiber plate (23) is rotatably mounted on the circumferential surface of sliding rod (22); A heat insulation board (24) is fixedly installed on the outer wall of the carbon fiber plate (23); Support roller (25), which is rotatably mounted on the outer wall of the fixed frame (21), and the support roller (25) is in contact with the bottom of the carbon fiber plate (23); Support plate (26), the support plate (26) is fixedly installed on the outer wall of the mounting frame (1); The limiting device includes a frame (41), which is fixedly installed on the top of the mounting frame (1). An elastic telescopic rod (42) is fixedly installed on the inner wall of the frame (41). An L-shaped plate (43) is fixedly installed on the telescopic end of the elastic telescopic rod (42). An elastic sheet (44) is provided on the side of the L-shaped plate (43) away from the elastic telescopic rod (42). A limiting block (45) is fixedly installed on the top of the frame (41), and a rectangular plate (46) is fixedly installed on the top of the L-shaped plate (43). A pin (47) slides through the top of the rectangular plate (46). A groove is provided on the side of the limiting block (45) near the elastic telescopic rod (42), and a round hole is provided on the top of the limiting block (45). The pin (47) contacts the inner wall of the round hole.

2. The online detection device for generator set lubricating oil viscosity according to claim 1, characterized in that: The outer wall of the mounting frame (1) is fixedly installed with a bracket fixing plate (31), which is used to fix the camera equipment. A temperature sensor (32) is provided on the top of the fixing frame (21), which is used to monitor the temperature of the carbon fiber plate (23) in real time.

3. The online viscosity detection device for generator set lubricating oil according to claim 2, characterized in that: A loading rack (27) is fixedly installed on the top of the fixed frame (21), and a heating device (28) is fixedly installed on the bottom of the loading rack (27).

4. The online detection device for generator set lubricating oil viscosity according to claim 3, characterized in that: The side wall of the support plate (26) is provided with a movable groove, the top of the support plate (26) is set as an inclined surface, and a rectangular groove is provided on the inclined surface of the support plate (26). A speed reduction device is provided on the support plate (26).

5. The online detection device for generator set lubricating oil viscosity according to claim 4, characterized in that: A gasket is provided on the circumferential surface of the sliding rod (22), and the gasket contacts the outer wall of the fixed frame (21). The gasket is used to restrict the sliding rod (22) from moving axially.

6. The online viscosity detection device for generator set lubricating oil according to claim 5, characterized in that: The speed reduction device includes a tripod (51) and a hollow cylinder (52). The tripod (51) is fixedly installed on the outer wall of the support plate (26), and the hollow cylinder (52) is fixedly installed on the inner wall of the tripod (51). A round rod (53) slides through the top of the hollow cylinder (52). A top plate (54) is fixedly installed on the top of the round rod (53). A pressure plate (55) is fixedly installed on the bottom of the round rod (53). A spring (56) is provided on the pressure plate (55) between the pressure plate (55) and the hollow cylinder (52). The pressure plate (55) is slidably connected to the hollow cylinder (52) through the spring (56). Tap water is provided inside the hollow cylinder (52). Several through holes are opened on the surface of the pressure plate (55).

7. The online viscosity detection device for generator set lubricating oil according to claim 6, characterized in that: A connecting rod (57) is fixedly installed on the circumferential surface of the round rod (53), and the connecting rod (57) is in contact with the inner wall of the movable groove.

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