Gas proportional valve

Abstract

The application provides a gas proportional valve with a new structure, which comprises a proportional adjusting device, a sleeve component and a valve rod core body assembly, the proportional adjusting device is provided with a containing cavity, the valve rod core body assembly comprises a core body component and a valve rod component, the core body component comprises a core body body part and a movable core component, the movable core component is located at the outer circumferential part of the core body body part, the upper end part of the core body body part is provided with a clamping groove, the clamping groove is provided with a clamping part, the valve rod component comprises a clamping part, the clamping part comprises an extension part and a clamping buckle part, the extension part extends along the axial direction of the valve rod part, the clamping part can be deformed, the clamping buckle part is in abutment with the clamping part, at least part of the clamping buckle part is located in the clamping groove, the core body body part and the valve rod are both made of plastic material, the connection mode of the valve rod component and the core body component is convenient, and the product can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic control and gas control, and in particular to a gas proportional valve. Background Art

[0002] The gas proportional valve includes a proportional adjustment device, which includes a moving core valve stem component and a static iron core. The moving core valve core component includes a moving iron core and a valve stem. The lower end of the valve stem is connected to a diaphragm assembly. When the proportional adjustment device is in the power-on mode, the moving core valve stem component moves downward toward the static iron core, the two are attracted, and the diaphragm assembly is relatively close to the proportional adjustment valve port. When the proportional adjustment device is in the power-off mode, the magnetic force disappears, the moving core valve stem component separates from the static iron core and moves upward, and the diaphragm assembly is relatively far away from the proportional adjustment valve port. The moving core and the valve stem are generally formed of metal materials, with high manufacturing costs and need to be fixed by interference fitting or welding, and the process is relatively cumbersome. Summary of the Invention

[0003] The main purpose of the present invention is to provide a gas proportional valve with a new structure, which is relatively convenient to connect the valve stem component and the core component and can relatively reduce the product manufacturing cost.

[0004] The present invention provides a gas proportional valve, including a proportional adjustment device, the proportional adjustment device is provided with an accommodating cavity, and also includes a sleeve component and a valve stem core assembly, at least part of the valve stem core assembly is located in the accommodating cavity, the valve stem core assembly includes a core component and a valve stem component, the core component includes a core body part and a dynamic core component, the dynamic core component is located at the outer periphery of the core body part, the dynamic core component can perform axial lifting and lowering movement along the sleeve wall of the sleeve component, the upper end portion of the core body part is provided with a slot, and also includes a stopping part, the valve stem part includes a locking part, the locking part includes an extension part and a buckle part, the extension part extends roughly along the axial direction of the valve stem part, the locking part can be deformed, the buckle part is engaged with the stopping part and abuts against each other, at least part of the buckle part is located in the slot, the core body part and the valve stem are both processed and molded from plastic material.

[0005] The present invention provides a gas proportional valve with a new structure, including a sleeve component and a valve stem core assembly. The valve stem core assembly includes a core component and a valve stem component. The core component includes a core body part and a moving core component. The moving core component is located at the outer periphery of the core body part. The upper end of the core body part is provided with a slot and also includes a stopping part. The valve stem component includes a locking part, and the locking part includes an extension part and a buckle part. The extension part extends roughly along the axial direction of the valve stem part. The locking part can be deformed, and the buckle part and the stopping part are engaged and offset. At least part of the buckle part is located in the slot. The core body part and the valve stem are both processed and molded from plastic material. Through the optimized design of the valve stem core assembly structure, the connection between the valve stem component and the core component can be made more convenient, and the product manufacturing cost can be relatively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 A schematic cross-sectional view of the overall structure of the gas proportional valve provided in this application;

[0007] Figure 2 A schematic cross-sectional view of a valve stem assembly provided for this application;

[0008] Figure 3 for Figure 1 A schematic cross-sectional view of a proportional adjustment device;

[0009] Figure 4 A schematic cross-sectional view of the structure of a proportional adjustment device of a first embodiment of a gas proportional valve provided in this application;

[0010] Figure 5 Schematic diagram of the cross-sectional structure of the proportional adjustment device of the second embodiment of the gas proportional valve provided in this application DETAILED DESCRIPTION

[0011] It should be noted that this application optimizes the design of the electromagnetic drive device structure, focusing on protecting the valve stem assembly structure of the electromagnetic drive device and the relationship between the valve stem assembly structure and components such as the sleeve and elastic parts. For other structures such as the static iron core, diaphragm assembly and other structures, adaptive improvements can be made according to customer or gas system requirements.

[0012] like Figure 1As shown, the present invention provides a gas proportional valve, including a body, which is provided with an inlet 1a and an outlet 1b, and a channel 14 for gas pressure relief and a channel 15 for gas circulation are formed in the body. Gas flows in from the inlet 1a and flows out from the outlet 1b. The body can be die-casted by aluminum alloy. The body is also provided with a first valve port 11, a second valve port 12 and a third valve port 13. The gas proportional valve also includes an electromagnetic drive device 2, a proportional adjustment device 3 and a pressure difference adjustment device 5. The electromagnetic drive device 2 is provided with two safety valves as a safety control component to safely control the on and off of the gas to prevent gas leakage. The proportional adjustment device 3 approaches or moves away from the third valve port 13 through the gas circulation channel through the diaphragm assembly 40, and acts on the back pressure buffer air cavity 55. The gas pressure in the back pressure buffer air cavity 55 changes, thereby acting on the valve stem 53 of the pressure difference adjustment device 5 to realize the regulation of the gas flow of the main valve port 52 of the pressure difference adjustment device 5. The pressure difference change of the back pressure buffer air cavity 55 of the main valve plug 51 can approach or move away from the main valve port 52.

[0013] like Figure 1 Combine Figure 2-3As shown, the electromagnetic drive device 2 includes a static iron core 21, a sleeve 22, a sleeve 24, an elastic member 23 and a valve stem assembly 25. The coil component is located at the outer periphery of the sleeve 22, and the coil component is arranged as a whole in the magnet 27. The magnet 27 is a shell component with magnetic conductivity that roughly surrounds the coil component. The static iron core 21 is fixedly connected to the magnet 27, and the sleeve 22 is fixedly connected to the static iron core 21. The sleeve 22 and the static iron core 21 roughly define the inner cavity of the electromagnetic drive device. Part of the sleeve 22 is located in the through hole of the coil component, part of the static iron core 21 is located in the magnet through hole of the magnet 27, part of the sleeve 24 is located in the inner cavity, and the other part of the sleeve 24 is exposed in the inner cavity. The sleeve 24 can be moved in the inner cavity along the sleeve wall of the sleeve 22. Axial lifting movement, the sleeve 24 has a sleeve cavity, part of the valve stem assembly 25 is located in the sleeve cavity, the lower end of the sleeve 24 is flanged and embedded with the second valve plug 101, the second valve plug 101 can approach or move away from the second valve port 12, the valve stem assembly 25 includes a valve stem component 251 and a dynamic core component 252, the valve stem component 251 is roughly cylindrical in structure, and can be integrally injection molded by plastic material, including a connecting portion 2512, the connecting portion 2512 is embedded with the first valve plug 102, the first valve plug 102 can approach or move away from the first valve port 11, the dynamic core component 252 includes a dynamic core body, an abutment portion 2525 and a recessed portion 2521, the dynamic core body is roughly cylindrical, and the recessed portion 2521 is formed by the upper surface of the abutment portion 2525 toward the close position. The connecting portion 2512 is concavely formed to roughly form a concave cavity 2523 of the valve stem assembly 25. The moving core body is located at the outer periphery of the valve stem component 251. The valve stem component 251 is further provided with a limiting portion 2511 at a position close to the connecting portion 2512. The limiting portion 2511 is against the moving core body. The valve stem component 251 is generally hollow and cylindrical in structure. The valve stem component 251 is provided with a valve stem cavity 25a. The recessed portion 2521 is press-fitted with the inner wall of the valve stem component 251, and at least part of the recessed portion 2521 is located in the valve stem cavity 25a. The moving core component 252 is further provided with a roughly annular groove 2524. Part of the valve stem component 251 is located in the groove 2524 and is clamped between the side wall of the recessed portion 2521 and the moving core body. In order to achieve a more reliable connection between the valve stem component 251 and the moving core component 252, the top wall of the upper end of the valve stem component 251 can be abutted against the bottom wall 2522 of the groove 2524. The moving core component 252 is abutted against the limiting portion 2511 through the lower end, and the groove 2524 at the upper end is engaged with the valve stem component 251. The moving core component 252 is limited to the valve stem component 251 as a whole, and part of the elastic component 23 is located in the recessed cavity 2523, and one end of the elastic component 23 is directly or indirectly abutted against the top wall of the sleeve 24, and the other end is directly or indirectly abutted against the bottom wall of the recess 2521. The moving core body can perform axial lifting and lowering movement in the sleeve cavity along the sleeve wall of the sleeve 24, and the abutting portion 2525 can approach or move away from the top wall of the sleeve 24.

[0014] When the electromagnetic drive device is in the power-on state, under the influence of the magnetic force, the valve stem assembly 25 moves as a whole toward the static iron core 21, and the valve stem assembly 25 overcomes the elastic force of the elastic member 23 and moves axially upward. The first valve plug 102 opens the first valve port 11, and the abutting portion 2525 abuts against the sleeve 24. The sleeve 24 moves axially upward, and the second valve plug 101 overcomes the main spring force and moves upward to open the second valve port 12. The first valve port and the second valve port are both in the open state. The gas enters from the inlet 1a and is discharged from the first valve port. 11 and the second valve port 12 flow into the gas flow channel 15; when the electromagnetic drive device is in the power-off state, the magnetic force disappears, the valve stem assembly 25 is separated from the static iron core 21, and is reset by the main spring force. The second valve plug 101 closes the second valve port 12, and is reset by the elastic member 23. The abutment portion 2525 is separated from the sleeve 24, and the first valve plug 102 closes the first valve port 11. It should be noted that in the actual opening or closing process of the first valve port and the second valve port, they are almost opened or closed at the same time.

[0015] The present invention provides a gas proportional valve, including an electromagnetic drive device, the electromagnetic drive device includes a valve stem assembly, the valve stem assembly includes a valve stem component and a dynamic core component, the valve stem component has a valve stem cavity, the dynamic core component includes a dynamic core body portion and a recessed portion, the dynamic core body portion is located at the outer periphery of the valve stem component, the recessed portion is press-fitted with the valve stem component, at least part of the recessed portion is located in the valve stem cavity, the dynamic core component is provided with a groove, part of the valve stem component is located in the groove, and the valve stem component is formed by processing of plastic material.

[0016] Through the optimized design of the valve stem assembly structure, the valve stem component is integrally formed from plastic material, and the dynamic core component is limitedly connected to the valve stem component. Compared with the dynamic core valve stem component formed from all-metal parts, better cost reduction can be achieved. In addition, the overall weight of the valve stem assembly can be relatively reduced, thereby relatively improving the weight and manufacturing cost of the gas proportional valve as a whole.

[0017] The following combination Figure 1 as well as Figure 4-Figure 5The structure of the proportional adjustment device of the gas proportional valve provided in the present application is introduced in detail. The proportional adjustment device 3 includes a magnet 31, a coil component 35 and a magnetic bushing 37. The coil component 35 is arranged as a whole in the magnet 31. The magnet 31 is provided with a magnet through-hole. The coil component 35 is provided with a coil component through-hole. The coil component 35 includes a skeleton component. The magnetic bushing 37 includes an upper magnetic bushing 371 and a lower magnetic bushing 372. The upper magnetic bushing 371 is limitedly connected to the skeleton component, and the lower magnetic bushing 372 is limitedly connected to the skeleton component. It also includes an adjusting part 32, an adjusting rod 33 and a matching part 34. Part of the matching part 34 is located in the magnet through-hole. The proportional adjustment device 3 also includes a sleeve component. The magnet 31 includes an upper magnet 31 1. The lower magnetic conductor 312 and the connecting portion 313, the sleeve component 36 is fixedly connected to the lower magnetic conductor, and part of the sleeve component 36 is clamped between the upper magnetic conductor bushing 371 and part of the matching component 34. In order to ensure good coaxiality between the components, the matching component 34 can be press-fitted with the sleeve component. The matching component 34 can be formed of plastic material and can be fixedly connected to the magnetic conductor 31 by tightening screws. The present application does not limit the material of the matching component 34. The matching component 34 includes an internal threaded portion 34a of the matching component, and the adjusting portion 32 includes an external threaded portion 32a of the adjusting portion. Through the threaded cooperation between the external threaded portion 32a of the adjusting portion and the internal threaded portion 34a of the matching component, the adjusting portion 32 can move downward or upward relative to the matching component 34 to achieve a high-pressure outlet pressure state. In order to accurately adjust the gas flow under the pressure, the adjusting part 32 can be integrally formed by plastic material. A hexagonal hole is provided on the top of the adjusting part 32 to facilitate the use with tools such as hexagonal bolts. The adjusting part 32 is also provided with an internal threaded portion 32b of the adjusting part, and the adjusting rod 33 is provided with an external threaded portion of the adjusting rod. The external threaded portion of the adjusting rod and the internal threaded portion 32b of the adjusting part are also threadedly matched. Through the threaded matching of the two, accurate adjustment of the gas flow under low-pressure outlet pressure state can be achieved. The proportional adjustment device 3 includes a valve stem core assembly and is also provided with an accommodating chamber B. At least part of the valve stem core assembly is located in the accommodating chamber B. The valve stem core assembly includes a core component 38 and a valve stem component 39. The core component 38 includes a core body portion 381, a dynamic core component 382 and a limiter 383, the core body part 381 is roughly a hollow cylindrical structure, the lower end of the core body part 381 is provided with a connecting portion 3811, the connecting portion 3811 and the diaphragm assembly 40 are embedded, the core body part 381 can be formed by integral injection molding of plastic material, the core body part 381 is also provided with a limiting boss portion near the connecting portion 3811, the moving core component 382 is roughly a cylindrical structure, the moving core component 382 is sleeved on the outer periphery of the core body part 381, and the lower end surface of the moving core component 382 is directly or indirectly against the limiting boss portion, the limiting member 383 is sleeved on the outer periphery of the core body part 381, the upper end surface of the moving core component 382 is directly or indirectly against the limiting member 383, and the moving core component 382 is clamped between the limiting member 383 and the limiting boss portion,The upper part of the dynamic core component 382 is acted upon by the limiting member 383, and the lower part is acted upon by the limiting boss portion to be limited as a whole on the core body portion 381. In order to achieve a more reliable limiting effect, the limiting member 383 can adopt a hollow annular metal pressing sheet and an interference fit with the core body portion 381. The dynamic core component 382 can perform axial lifting and lowering movement in the accommodating cavity B along the sleeve wall of the sleeve component 36. It should be noted that the dynamic core component 382 can also be directly sleeved on the core body portion 381 by means of press-fitting. The outer periphery of the core body 381, the valve stem component 39 is roughly located above the core body component 38, including an abutment portion 391, a main body portion 392 and a locking portion 393. The valve stem component 39 also has a valve stem cavity 39a. The adjustment portion 32 is provided with an adjustment portion inner cavity 32C and a notch. The lower end is provided with a support portion 321 extending roughly radially toward the axial direction of the adjustment portion 32. The main body 392 of the valve stem component 39 can be installed into the adjustment portion inner cavity 32C with a notch roughly in the radial direction. When When the proportional adjustment device is in the de-energized state, the abutment portion 391 abuts against the adjustment rod 33, the abutment portion 391 is relatively far away from the support portion 321, the valve stem component 39 is limitedly connected to the core component 38, and the diaphragm assembly 40 is also relatively far away from the third valve port 13. The valve port opening of the third valve port 13 is relatively large, and the gas flow rate at the outlet 1b is relatively small when the proportional adjustment device is in the energized state, the dynamic core component 382 moves in the direction of maximum magnetic flux, and the core component 38 moves downward toward the lower magnetic conductive bushing 372 until the abutment portion 391 abuts against the support portion 321. At this time, the abutment portion 391 is relatively far away from the adjustment rod 33, the diaphragm assembly 40 is relatively close to the third valve port 13, the valve port opening of the third valve port 13 is relatively small, the gas pressure acting on the gas flow channel 15 is relatively large, affecting the gas pressure in the back pressure buffer air cavity 55, the main valve port 52 is relatively open, and the outlet 1b is in the relatively high pressure adjustment mode, with a relatively large gas flow rate.

[0018] The following combination Figure 4 and Figure 5 The connection relationship between the valve stem component 39 and the core component 38 is described in detail. The upper end of the core body part 381 is provided with a slot 3812 near the limit piece 383, and also includes a locking portion 3813. The locking portion 3813 is roughly a protrusion in the radial direction toward the axial direction of the core body part 381. The locking portion 393 includes an extension portion 3931 and a buckle portion 3932. The extension portion 3931 extends roughly along the axial direction of the valve stem component 39, and the buckle portion 3932 protrudes roughly in the radial direction away from the axial direction of the valve stem component 39. The locking portion 393 can undergo elastic or plastic deformation. The buckle portion and the locking portion 3813 are locked and offset. At least part of the buckle portion 3932 is located in the slot 3812, so that the valve stem component 39 and the core component 38 are connected in a locked and limited manner as a whole. The valve stem cavity 39a is to facilitate the deformation of the locking portion 393.

[0019] When the proportional adjustment device is in the power-off state, the horizontal projection of the moving core component 382 on the axis of the core body 381 and the horizontal projection of the upper magnetic conductive bushing 371 on the axis of the core body 381 have a first overlapping area, and the horizontal projection of the moving core component 382 on the axis of the core body 381 and the horizontal projection of the lower magnetic conductive bushing 372 on the axis of the core body 381 do not have an overlapping area, and the two form a spacing L, and the height of the first overlapping area is greater than the height of the spacing L; when the proportional adjustment device is in the power-on state, the valve stem core assembly moves downward as a whole, and the moving core component 382 moves in the direction of maximum magnetic flux, that is, toward the lower magnetic conductive bushing 3 72 movement, the horizontal projection of the moving core component 382 on the axis of the core body part 381 and the horizontal projection of the lower magnetic conductive bushing 372 on the axis of the core body part 381 have a second overlapping area, and the height of the first overlapping area is greater than the height of the second overlapping area. Through the above arrangement, the downward movement stroke of the moving core component after power is turned on can be relatively guaranteed. By optimizing the overall structure of the valve stem core assembly, the setting of the static iron core component can be cancelled. By separately arranging the upper and lower magnetic conductive bushings to achieve cooperation with the moving core component, the valve stem core assembly as a whole can be able to perform axial lifting and lowering movement in the accommodating chamber B, thereby optimizing the overall structure of the proportional adjustment device and reducing the parts setting.

[0020] The present invention optimizes the overall structure of the valve stem core assembly. Compared with the background technology that requires interference pressing or welding to connect the valve stem dynamic core component, the valve stem component and the core component of the present invention can be connected through a relatively simple snap-fit ​​limit, and the connection method between the two is relatively convenient. In addition, the structure does not have a static iron core structure, the number of parts is reduced, and the overall structure of the proportional adjustment device is optimized. In addition, the core body part 381 of the core component 38 and the valve stem component 39 can both be processed and formed from plastic materials, which can achieve further cost reduction compared to metal material processing, and the product manufacturing cost can be greatly reduced.

[0021] The following combination Figure 5 Another embodiment of the valve stem core assembly of the proportional control device is introduced. Figure 4The difference is that the engagement positions of the valve stem component and the core body part have been changed. The valve stem component 39' includes abutment portion 391', a body portion and a locking portion, the locking portion includes an extension portion 3931' and a snap portion 3932', the valve stem component has a valve stem cavity 391', the valve stem cavity 391' also includes a valve stem groove, the snap portion 3932' protrudes roughly in the radial direction toward the axial direction close to the valve stem component 39', the upper end of the core body part is provided with a locking groove 3812', and also includes a locking portion 3813', the locking portion 3813' extends roughly in the radial direction toward the axial direction away from the core body part, at least part of the locking portion 3813' is located in the valve stem groove, the locking portion is deformed, the snap portion 3932' is locked and limited with the locking portion 3813', and at least part of the snap portion 3932' is located in the locking groove 3812', which can also achieve the technical effect of the present application, and the corresponding technical effect has been mentioned above. Figure 4 The specific description will be made in the embodiments of the present invention, and will not be repeated here.

[0022] It should be noted that the ordinal numbers such as "first, second" and the directional words such as "upper, lower" mentioned in the present invention are all described based on the drawings in the specification. They are only used to distinguish the naming methods of different components and should not be considered to have any restrictions on the order of the components. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A gas proportional valve, characterized in that: It includes a proportional adjustment device, which is provided with an accommodating cavity, and also includes a sleeve component and a valve stem core assembly, at least part of the valve stem core assembly is located in the accommodating cavity, the valve stem core assembly includes a core component and a valve stem component, the core component includes a core body part and a dynamic core component, the dynamic core component is located at the outer periphery of the core body part, the dynamic core component can perform axial lifting and lowering movement along the sleeve wall of the sleeve component, the upper end of the core body part is provided with a slot, and also includes a stopping part, the valve stem part includes a locking part, the locking part includes an extension part and a snap part, the extension part extends along the axial direction of the valve stem part, the locking part can be deformed, the snap part is engaged with the stopping part and abuts against each other, at least part of the snap part is located in the slot, the core body part and the valve stem part are both processed and molded from plastic material.

2. A gas proportional valve according to claim 1, characterized in that: The locking portion protrudes in a radial direction toward an axial direction close to the core body portion, and the buckle portion protrudes in a radial direction toward an axial direction away from the valve stem component.

3. A gas proportional valve according to claim 1, characterized in that: The locking portion protrudes radially toward the axial direction away from the core body, and the buckle portion protrudes radially toward the axial direction close to the valve stem component. The valve stem component is provided with a valve stem cavity, and the valve stem cavity includes a valve stem groove. At least part of the locking portion is located in the valve stem groove.

4. A gas proportional valve according to claim 1, characterized in that: The proportional adjustment device includes an upper magnetic conductive bushing and a lower magnetic conductive bushing. When the proportional adjustment device is in a power-off state, a horizontal projection of the dynamic core component on the axis of the valve stem component and a horizontal projection of the upper magnetic conductive bushing on the axis of the valve stem component have a first overlapping area, and a horizontal projection of the dynamic core component on the axis of the valve stem component and a horizontal projection of the lower magnetic conductive bushing on the axis of the valve stem component do not have an overlapping area. When the proportional adjustment device is in an energized state, a second overlapping area exists between the horizontal projection of the moving core component on the axis of the valve stem component and the horizontal projection of the lower magnetic bushing on the axis of the valve stem component, and the height of the first overlapping area is greater than the height of the second overlapping area.

5. A gas proportional valve according to any one of claims 1 to 4, characterized in that: The core component further includes a limiting member, the core body portion includes a limiting boss portion, the limiting member is press-fitted with the core body portion, and the dynamic core component is directly or indirectly clamped between the limiting member and the limiting boss portion.

6. A gas proportional valve according to claim 5, characterized in that: The core body portion further includes a connecting portion, in which a diaphragm assembly is embedded, and the limiting boss portion is arranged close to the connecting portion.

7. A gas proportional valve according to any one of claims 1 to 4, characterized in that: The proportional adjustment device includes a magnetic conductor, a matching piece, an upper magnetic conductive bushing and a lower magnetic conductive bushing. The matching piece is fixedly connected to the magnetic conductor. The magnetic conductor includes an upper magnetic conductor, a lower magnetic conductor and a connecting part. The sleeve part is fixedly connected to the lower magnetic conductor. Part of the matching piece is located in the through hole of the magnetic conductor, and part of the sleeve part is clamped between the upper magnetic conductive bushing and the matching piece.

8. A gas proportional valve according to any one of claims 1 to 4, characterized in that: The proportional adjustment device also includes an adjustment part, which is provided with an adjustment part inner cavity and a notch. The valve stem component is provided with a valve stem cavity, and also includes an abutment part and a main body part. The main body part is located between the abutment part and the locking part, and the main body part can be radially inserted into the adjustment part inner cavity through the notch.

9. A gas proportional valve according to claim 8, characterized in that: The proportional adjustment device also includes a mating piece and an adjustment rod, the mating piece is threadedly engaged with the adjustment part, the adjustment rod is threadedly engaged with the adjustment part, and the adjustment part includes a supporting part. When the proportional adjustment device is in a power-on state, the abutting part is relatively far away from the adjustment rod and abuts against the supporting part. When the proportional adjustment device is in a power-off state, the abutting part is relatively far away from the support part and abuts against the adjustment rod.

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