Shifting rod device and shifting rod method for adjusting positions of upper and lower limit pointers of pressure gauge

Abstract

The invention discloses a shifting rod device and a shifting rod method for adjusting the positions of upper and lower limit pointers of a pressure gauge, and relates to the technical field of pressure gauges. A shifting rod device for adjusting the positions of upper and lower limit pointers of a pressure gauge comprises a pressure gauge transparent shell connected with a sleeve, and further comprises an end cylinder located at one end of the sleeve; the main shaft is movably connected in the sleeve, a sleeve rod is movably connected in an end sleeve of the sleeve, the sleeve rod is connected with one end of the main shaft, a shifting rod piece is installed on the end face of the sleeve rod, and the shifting rod piece is located in a transparent shell of the pressure gauge; by changing the position of the main shaft in the sleeve, the operation of driving the shifting rod piece to rotate substantially and rotate finely is achieved, specifically, the tail end block on the main shaft is separated from the end barrel, so that the main shaft and the rubber sleeve are matched to achieve large-amplitude adjustment, and when the tail end block enters the end barrel, meshing of the interval teeth and the interval grooves is achieved; and fine adjustment operation is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of pressure gauges, and in particular relates to a lever device for adjusting the positions of upper and lower limit pointers of a pressure gauge. Background Art

[0002] Electric contact pressure gauges are widely used in industries such as petroleum, chemical industry, metallurgy, power stations, machinery, and other industries, or in supporting electromechanical equipment to measure the pressure of various non-explosive fluid media. Electric contact pressure gauges require a lever structure to adjust the upper and lower limit pointers. The lever is usually set to rotate, which can make the lever rotate and move the upper and lower limit pointers for rotation and shifting. The flexibility of the shaft rotation is the key to determining the rotation of the upper and lower limit pointers. When the shaft rotation flexibility is too high, the damping feeling is lost, and it is difficult to flexibly move the upper and lower limit pointers when adjusting them. Moreover, when not moving, an overly flexible or loose shaft may also affect the use of the pressure gauge. At the same time, when fine-tuning the upper and lower limit pointers, it is difficult to accurately control the angle of fine-tuning rotation of the existing lever, which makes it difficult to perform the operation when fine-tuning the upper and lower limit pointers is required. Therefore, a lever device for adjusting the position of the upper and lower limit pointers of the pressure gauge is proposed. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a position shifting device for adjusting the upper and lower limit pointers of a pressure gauge, which can overcome the above problems or at least partially solve the above problems.

[0004] To solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a position shift lever device for adjusting the upper and lower limit pointers of a pressure gauge, comprising a transparent housing of a pressure gauge connected to a sleeve, and further comprising: an end tube located at one end of the sleeve; a main shaft movably connected to the sleeve, a sleeve rod movably connected in the end tube of the sleeve, the sleeve rod being connected to one end of the main shaft, a shift lever member being installed on the end surface of the sleeve rod, and the shift lever member being located in the transparent housing of the pressure gauge; a rubber sleeve located in the sleeve, the rubber sleeve being provided on the main shaft for providing friction for the rotation of the main shaft; an end block fixedly connected to one end of the main shaft, spacer teeth being provided on the outer circumference of the end block, and spacer grooves being provided on the inner wall of the end tube, when the main shaft is pushed toward the transparent housing of the pressure gauge, the spacer teeth engage with the spacer grooves to provide spacer damping for fine adjustment of the shift lever member; when the main shaft is pulled away from the transparent housing of the pressure gauge, the spacer teeth disengage from the spacer grooves.

[0005] Preferably, a connecting column is fixedly connected to the end block, a polygonal slider is fixedly connected to the end of the connecting column away from the main shaft, a polygonal slide groove is provided in the sleeve rod near the main shaft, and the polygonal slide block is slidably connected in the polygonal slide groove.

[0006] Furthermore, a metal ring is fixedly connected to the outer periphery of the sleeve rod, and magnets are symmetrically arranged on the inner wall of the end tube. When the main shaft is pulled away from one end of the transparent shell of the pressure gauge, the sleeve rod moves with the main shaft until the magnet and the metal ring are adsorbed.

[0007] Preferably, a fixing ring and a limiting ring are fixedly connected to the sleeve respectively, a spring is sleeved on the main shaft between the fixing ring and the end block, the limiting ring is located between the fixing ring and the end block, the outer diameter of the end block is larger than the inner diameter of the limiting ring, and the outer diameter of the spring is smaller than the inner diameter of the limiting ring.

[0008] Furthermore, a biting edge is provided on the circumference of the outer wall of the main shaft, and the biting edge corresponds to the rubber sleeve.

[0009] Preferably, a front cover is provided at one end of the sleeve, the rubber sleeve is connected to the front cover, a cable tie is provided on the rubber sleeve, one end of the cable tie passes through the sleeve to the outside of the sleeve, and the tightness of the rubber sleeve is adjusted by pulling one end of the cable tie.

[0010] Furthermore, a connecting rod is fixedly connected to the outer periphery of the main shaft, a tightening sleeve is fixedly connected to the connecting rod, and the tightening sleeve is provided on the rubber sleeve.

[0011] Preferably, a knob is installed at one end of the main shaft away from the transparent housing of the pressure gauge.

[0012] Preferably, the sleeve is mounted on the transparent housing of the pressure gauge by screws.

[0013] A method for adjusting the position of the upper and lower limit pointers of a pressure gauge comprises the following steps: S1. Push the spindle close to the transparent housing of the pressure gauge. While pushing the spindle, push the sleeve rod synchronously to make the lever close to the upper and lower limit pointers. S2. When the lever is rotated significantly, after pushing the sleeve rod, the main shaft is pulled back to separate the end block on the main shaft from the end tube; S3. When fine-tuning is performed to rotate the lever, after pushing the sleeve rod and engaging the spacing teeth with the spacing grooves, the main shaft is rotated to perform fine-tuning.

[0014] After adopting the above technical solution, the present invention has the following advantages compared with the prior art: the present invention realizes the operation of driving the lever member to rotate greatly and fine-tune the rotation by changing the position of the main shaft in the sleeve. Specifically, the end block on the main shaft is separated from the end tube, so that the main shaft and the rubber sleeve can cooperate to achieve large-scale adjustment. When the end block enters the end tube, the spaced teeth and the spaced grooves are engaged, thereby achieving fine-tuning operation. Furthermore, when it is necessary to fine-tune the upper and lower limit pointers in the pressure gauge, the adjustment is basically the same as the large-scale adjustment. The difference is that after pushing the main shaft, the main shaft is no longer pulled to reset. Instead, after pushing the main shaft so that the lever is close to the upper and lower limit pointers, the main shaft is directly rotated. Because when the main shaft is pushed close to the transparent shell of the pressure gauge, the end block enters the end tube, so that the spacing teeth on the outer periphery of the end block are engaged with the spacing grooves on the inner diameter of the end tube. At this time, when the main shaft is rotated, the spacing teeth and the spacing grooves rub against each other, and a spacing damping feeling will appear, and the spacing damping feeling will be transmitted to the operator's hand. Therefore, when the operator is making fine adjustments, he can achieve the fine-tuning operation of driving the upper and lower limit pointers according to the interval damping feeling. At the same time, during fine-tuning, the main shaft is simultaneously subjected to friction damping by the rubber sleeve, the spacing teeth, and the spacing grooves, which makes the adjustment of the main shaft more precise. By setting the bite blade, when pushing and pulling the spindle, the bite blade will produce friction with the rubber sleeve, so that the blade mark will appear on the inner diameter of the rubber sleeve, thereby increasing the friction between the rubber sleeve and the spindle, thereby preventing the friction between the rubber sleeve and the spindle from weakening after long-term use; At the same time, when making large adjustments, the setting of the bite edge can also increase the damping of the spindle rotation, making it more convenient to rotate the spindle; When the gap between the rubber sleeve and the main shaft increases, causing the main shaft to rotate too easily, one end of the cable tie can be pulled to tighten the part of the cable tie on the rubber sleeve, thereby maintaining the friction damping between the rubber sleeve and the main shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In the attached figure: Figure 1 This is a structural schematic diagram of a lever member of a lever device for adjusting the positions of the upper and lower limit pointers of a pressure gauge proposed by the present invention; Figure 2 This is a structural schematic diagram of a sleeve of a lever device for adjusting the positions of the upper and lower limit pointers of a pressure gauge proposed by the present invention; Figure 3 This is a structural schematic diagram of the main shaft of a lever device for adjusting the positions of the upper and lower limit pointers of a pressure gauge proposed by the present invention; Figure 4 This is a structural schematic diagram of a limit ring of a lever device for adjusting the positions of the upper and lower limit pointers of a pressure gauge proposed by the present invention; Figure 5The present invention proposes a lever device for adjusting the position of the upper and lower limit pointers of a pressure gauge. Figure 4 Schematic diagram of the structure at A in the middle; Figure 6 This is a structural diagram of a sleeve rod and an end block of a lever device for adjusting the positions of the upper and lower limit pointers of a pressure gauge proposed by the present invention; Figure 7 This is a structural diagram of a rubber sleeve and a biting blade of a lever device for adjusting the positions of the upper and lower limit pointers of a pressure gauge proposed by the present invention; Figure 8 This is an exploded view of a lever device for adjusting the positions of the upper and lower limit pointers of a pressure gauge proposed by the present invention.

[0016] In the figure: 1. Transparent shell of pressure gauge; 2. Sleeve; 20. End sleeve; 200. Spacer groove; 201. Limiting ring; 202. Spring; 203. Fixing ring; 204. Front cover; 205. Engaging edge; 206. Rubber sleeve; 207. Tightening sleeve; 208. Connecting rod; 209. Knob; 21. Spindle; 22. End block; 221. Spacer teeth; 23. Connecting column; 24. Polygonal slider; 25. Sleeve rod; 251. Metal ring; 252. Magnet; 26. Polygonal slide groove; 27. Lever; 3. Cable tie; 4. Screw. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0018] Example 1: Reference Figures 1-8 A lever device for adjusting the position of the upper and lower limit pointers of a pressure gauge includes a transparent housing 1 of a pressure gauge connected to a sleeve 2, and further includes: an end sleeve 20 located at one end of the sleeve 2; a main shaft 21 movably connected to the sleeve 2, a sleeve rod 25 movably connected to the end sleeve 20 of the sleeve 2, the sleeve rod 25 is connected to one end of the main shaft 21, a lever member 27 is installed on the end surface of the sleeve rod 25, and the lever member 27 is located in the transparent housing 1 of the pressure gauge; a rubber sleeve 206 is located in the sleeve 2, and the rubber sleeve 206 is sleeved on the main shaft 2 1, used to provide friction for the rotation of the main shaft 21; the end block 22 is fixedly connected to one end of the main shaft 21. The outer periphery of the end block 22 is provided with spacing teeth 221, and the inner wall of the end tube 20 is provided with a spacing groove 200. When the main shaft 21 is pushed toward the transparent housing 1 of the pressure gauge, the spacing teeth 221 engage with the spacing groove 200, providing spacing damping for the fine adjustment of the lever member 27; when the main shaft 21 is pulled away from the transparent housing 1 of the pressure gauge, the spacing teeth 221 disengage from the spacing groove 200. A connecting column 23 is fixedly connected to the end block 22. A polygonal slider 24 is fixedly connected to the end of the connecting column 23 away from the main shaft 21. A polygonal slide groove 26 is provided in the sleeve rod 25 near the main shaft 21. The polygonal slider 24 is slidably connected to the polygonal slide groove 26. A knob 209 is installed at one end of the main shaft 21 away from the transparent housing 1 of the pressure gauge; The sleeve 2 is mounted on the transparent housing 1 of the pressure gauge by means of screws 4; When the device is in use, when it is necessary to adjust the upper and lower limit pointers in the pressure gauge by the lever member 27, the main shaft 21 is first pushed close to the transparent housing 1 of the pressure gauge so that the end block 22 on the main shaft 21 slides into the end tube 20. When the end block 22 contacts one end of the sleeve rod 25, the main shaft 21 pushes the sleeve rod 25 to slide on the end tube 20, thereby pushing the lever member 27 close to the upper and lower limit pointers. Then, the main shaft 21 is pulled to separate the main shaft 21 and the sleeve rod 25 (it should be understood that there is a certain friction resistance between the sleeve rod 25 and the end tube 20), so that the end block 22 is separated from the end tube 20. Then, the main shaft 21 is rotated. The main shaft 21 relies on the friction damping provided by the rubber sleeve 206 to drive the lever member 27 to rotate, thereby dialing the upper and lower limit pointers for rotation adjustment. The provision of the rubber sleeve 206 can reduce the flexibility of the main shaft 21 during the rotation process, thereby preventing the main shaft 21 from rotating or shaking arbitrarily.

[0019] When it is necessary to fine-tune the upper and lower limit pointers in the pressure gauge, the adjustment is basically the same as the large-scale adjustment. The difference is that after pushing the main shaft 21, the main shaft 21 is no longer pulled to reset. Instead, after pushing the main shaft 21 so that the lever 27 is close to the upper and lower limit pointers, the main shaft 21 is directly rotated. Because when the main shaft 21 is pushed close to the transparent shell 1 of the pressure gauge, the end block 22 enters the end tube 20, so that the spacing teeth 221 on the outer periphery of the end block 22 engage with the spacing groove 200 on the inner diameter of the end tube 20. At this time, when the main shaft 21 is rotated, the spacing teeth 221 rub against the spacing groove 200, and a spacing damping feeling will appear, and the spacing damping feeling will be transmitted to the operator's hand. Therefore, when the operator is making fine adjustments, he can achieve the fine adjustment operation of driving the upper and lower limit pointers according to the spacing damping feeling. At the same time, during fine adjustment, the main shaft 21 is simultaneously subjected to friction damping by the rubber sleeve 206, the spacing teeth 221, and the spacing groove 200, which makes the adjustment of the main shaft 21 more precise.

[0020] When the adjustment is completed, the main shaft 21 is pulled, and when the polygonal slider 24 slides to the front end of the polygonal slide groove 26, the main shaft 21 will drive the sleeve rod 25 to move together, thereby making the lever member 27 move away from the upper and lower limit pointers.

[0021] Example 2: Reference Figures 1-8A lever device for adjusting the position of the upper and lower limit pointers of a pressure gauge includes a transparent housing 1 of a pressure gauge connected to a sleeve 2, and further includes: an end tube 20 located at one end of the sleeve 2; a main shaft 21 movably connected to the sleeve 2, a sleeve rod 25 movably connected in the end tube 20 of the sleeve 2, the sleeve rod 25 is connected to one end of the main shaft 21, a lever member 27 is installed on the end surface of the sleeve rod 25, and the lever member 27 is located in the transparent housing 1 of the pressure gauge; a rubber sleeve 206 is located in the sleeve 2, and the rubber sleeve 206 is sleeved on the main shaft The end block 22 is fixedly connected to one end of the main shaft 21, and a spacing tooth 221 is provided on the outer periphery of the end block 22. A spacing groove 200 is provided on the inner wall of the end tube 20. When the main shaft 21 is pushed toward the transparent housing 1 of the pressure gauge, the spacing tooth 221 engages with the spacing groove 200 to provide interval damping for the fine adjustment of the lever 27; when the main shaft 21 is pulled away from the transparent housing 1 of the pressure gauge, the spacing tooth 221 engages with the spacing groove 200. 00 disengagement; a connecting column 23 is fixedly connected to the end block 22, and a multi-faceted slider 24 is fixedly connected to the end of the connecting column 23 away from the main shaft 21. A multi-faceted slide groove 26 is provided in the sleeve rod 25 near the main shaft 21, and the multi-faceted slider 24 is slidably connected to the multi-faceted slide groove 26; a biting blade 205 is provided on the circumference of the outer wall of the main shaft 21, and the biting blade 205 corresponds to the rubber sleeve 206; a connecting rod 208 is fixedly connected to the outer periphery of the main shaft 21, and a tight sleeve 20 is fixedly connected to the connecting rod 208 7. The tightening sleeve 207 is sleeved on the rubber sleeve 206; a knob 209 is installed on the end of the main shaft 21 away from the transparent housing 1 of the pressure gauge; the sleeve 2 is installed on the transparent housing 1 of the pressure gauge by screws 4. Furthermore, a metal ring 251 is fixedly connected to the outer periphery of the sleeve rod 25, and magnets 252 are symmetrically arranged on the inner wall of the end tube 20. When the main shaft 21 is pulled toward the end away from the transparent housing 1 of the pressure gauge, the sleeve rod 25 moves with the main shaft 21 until the magnet 252 and the metal ring 251 are attracted; When the upper and lower limit pointers are adjusted, the main shaft 21 is pulled, which causes the sleeve rod 25 to move together. In order to prevent the sleeve rod 25 from sliding and causing the lever member 27 to approach the upper and lower limit pointers again, the metal ring 251 on the outer circumference of the sleeve rod 25 is attracted by the magnet 252 when the sleeve rod 25 moves with the main shaft 21, thereby completing the limit of the sleeve rod 25. In addition, the metal ring 251 slides in the end tube 20 to limit the sleeve rod 25 .

[0022] Example 3: Reference Figures 1-8A lever device for adjusting the position of the upper and lower limit pointers of a pressure gauge includes a transparent housing 1 of a pressure gauge connected to a sleeve 2, and further includes: an end tube 20 located at one end of the sleeve 2; a main shaft 21 movably connected to the sleeve 2, a sleeve rod 25 movably connected in the end tube 20 of the sleeve 2, the sleeve rod 25 is connected to one end of the main shaft 21, a lever member 27 is installed on the end surface of the sleeve rod 25, and the lever member 27 is located in the transparent housing 1 of the pressure gauge; a rubber sleeve 206 is located in the sleeve 2, and the rubber sleeve 206 is sleeved on the main shaft 21 for The end block 22 is fixedly connected to one end of the main shaft 21, and a spacing tooth 221 is provided on the outer periphery of the end block 22. A spacing groove 200 is provided on the inner wall of the end tube 20. When the main shaft 21 is pushed toward the transparent housing 1 of the pressure gauge, the spacing tooth 221 engages with the spacing groove 200 to provide spacing damping for the fine adjustment of the lever 27; when the main shaft 21 is pulled away from the transparent housing 1 of the pressure gauge, the spacing tooth 221 disengages from the spacing groove 200; the end block 22 is fixedly connected to one end of the main shaft 21. A connecting column 23 is connected, and a polygonal slider 24 is fixedly connected to the end of the connecting column 23 away from the main shaft 21. A polygonal slide 26 is provided in the sleeve rod 25 near the main shaft 21, and the polygonal slider 24 is slidably connected to the polygonal slide 26; a bite blade 205 is provided on the circumference of the outer wall of the main shaft 21, and the bite blade 205 corresponds to the rubber sleeve 206; a connecting rod 208 is fixedly connected to the outer circumference of the main shaft 21, and a tight sleeve 207 is fixedly connected to the connecting rod 208, and the tight sleeve 207 is sleeved on the rubber sleeve 206; the main shaft A knob 209 is installed at the end of the sleeve 21 away from the transparent housing 1 of the pressure gauge; the sleeve 2 is installed on the transparent housing 1 of the pressure gauge by means of screws 4. Furthermore, a fixing ring 203 and a limiting ring 201 are fixedly connected to the sleeve 2, respectively. A spring 202 is sleeved on the main shaft 21 between the fixing ring 203 and the end block 22. The limiting ring 201 is located between the fixing ring 203 and the end block 22. The outer diameter of the end block 22 is larger than the inner diameter of the limiting ring 201, and the outer diameter of the spring 202 is smaller than the inner diameter of the limiting ring 201. The setting of the spring 202 enables the main shaft 21 to quickly return to its original position when the sleeve rod 25 is pulled back, facilitating large-scale rotation or fine-tuning operations; The setting of the limiting ring 201 can prevent the main shaft 21 from being pulled too far.

[0023] Example 4: Reference Figures 1-8 A lever device for adjusting the position of the upper and lower limit pointers of a pressure gauge is basically the same as that of Example 3, but further comprises: a biting blade 205 is provided on the circumference of the outer wall of the main shaft 21, and the biting blade 205 corresponds to the rubber sleeve 206; a front cover 204 is provided at one end of the sleeve 2, and the rubber sleeve 206 is connected to the front cover 204. A cable tie 3 is sleeved on the rubber sleeve 206, and one end of the cable tie 3 passes through the sleeve 2 to the outside of the sleeve 2. The tightness of the rubber sleeve 206 is adjusted by pulling the one end of the cable tie 3; By providing the biting blade 205, during the process of pushing and pulling the main shaft 21, the biting blade 205 will generate friction with the rubber sleeve 206, so that the inner diameter of the rubber sleeve 206 will have a blade mark, thereby increasing the friction between the rubber sleeve 206 and the main shaft 21, thereby preventing the friction between the rubber sleeve 206 and the main shaft 21 from weakening after long-term use; At the same time, when making large adjustments, the setting of the biting blade 205 can also increase the damping of the rotation of the main shaft 21, making it more convenient to rotate the main shaft 21; When the gap between the rubber sleeve 206 and the main shaft 21 increases, causing the main shaft 21 to rotate too easily, you can pull one end of the cable tie 3 to tighten the part of the cable tie 3 that is wrapped around the rubber sleeve 206, thereby maintaining the friction damping between the rubber sleeve 206 and the main shaft 21. Furthermore, a connecting rod 208 is fixedly connected to the outer periphery of the main shaft 21, and a tight sleeve 207 is fixedly connected to the connecting rod 208. The tight sleeve 207 is sleeved on the rubber sleeve 206; When the main shaft 21 is pulled back during large adjustments, the tightening sleeve 207 will press against and fit over the rubber sleeve 206, so that the rubber sleeve 206 is in close contact with the outer periphery of the main shaft 21, thereby preventing the problem of excessive gap between the main shaft 21 and the rubber sleeve 206 after long-term use; Example 5: Reference Figures 1-8 A method for adjusting the position of the upper and lower limit pointers of a pressure gauge includes the following steps: S1. Push the main shaft 21 close to the transparent housing 1 of the pressure gauge. When pushing the main shaft 21, push the sleeve rod 25 synchronously to make the lever 27 close to the upper and lower limit pointers; S2. When the lever 27 is rotated significantly, the sleeve rod 25 is pushed and the main shaft 21 is pulled back, so that the end block 22 on the main shaft 21 is separated from the end tube 20; S3. When fine adjustment is performed to rotate the lever 27, after pushing the sleeve rod 25 and making the spacing teeth 221 engage with the spacing grooves 200, the main shaft 21 is rotated to perform fine adjustment.

[0024] The present invention changes the position of the main shaft 21 in the sleeve 2, thereby achieving the operation of driving the lever member 27 to rotate greatly and fine-tune the rotation. Specifically, the end block 22 on the main shaft 21 is separated from the end tube 20, so that the main shaft 21 and the rubber sleeve 206 cooperate to achieve large-scale adjustment. When the end block 22 enters the end tube 20, the spacing teeth 221 are engaged with the spacing grooves 200, thereby achieving fine-tuning operation.

[0025] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the present invention can make slight changes or modifications to equivalent embodiments using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A lever device for adjusting the position of the upper and lower limit pointers of a pressure gauge, comprising a transparent housing (1) of the pressure gauge connected to a sleeve (2), characterized in that: Also includes: An end tube (20) is located at one end of the sleeve (2); A main shaft (21) is movably connected in the sleeve (2), a sleeve rod (25) is movably connected in the end tube (20) of the sleeve (2), the sleeve rod (25) is connected to one end of the main shaft (21), a lever member (27) is installed on the end surface of the sleeve rod (25), and the lever member (27) is located in the transparent housing (1) of the pressure gauge; A rubber sleeve (206) is located in the sleeve (2), and the rubber sleeve (206) is sleeved on the main shaft (21) and is used to provide friction for the rotation of the main shaft (21); The end block (22) is fixedly connected to one end of the main shaft (21), and the outer periphery of the end block (22) is provided with a spacing tooth (221), and the inner wall of the end tube (20) is provided with a spacing groove (200). When the main shaft (21) is pushed toward the transparent housing (1) of the pressure gauge, the spacing teeth (221) engage with the spacing grooves (200), providing spacing damping for fine adjustment of the lever member (27); When the main shaft (21) is pulled to move away from the transparent housing (1) of the pressure gauge, the spacing teeth (221) are disengaged from the spacing grooves (200).

2. A lever device for adjusting the position of the upper and lower limit pointers of a pressure gauge according to claim 1, characterized in that: The end block (22) is fixedly connected to a connecting column (23), and an end of the connecting column (23) away from the main shaft (21) is fixedly connected to a multi-faceted sliding block (24). A multi-faceted sliding groove (26) is provided in the sleeve rod (25) near the main shaft (21), and the multi-faceted sliding block (24) is slidably connected in the multi-faceted sliding groove (26).

3. A lever device for adjusting the position of the upper and lower limit pointers of a pressure gauge according to claim 2, characterized in that: A metal ring (251) is fixedly connected to the outer periphery of the sleeve rod (25), and magnets (252) are symmetrically arranged on the inner wall of the end tube (20). When the main shaft (21) is pulled to move away from the end of the transparent housing (1) of the pressure gauge, the sleeve rod (25) moves along with the main shaft (21) until the magnet (252) and the metal ring (251) are attracted.

4. A lever device for adjusting the position of the upper and lower limit pointers of a pressure gauge according to claim 3, characterized in that: A fixing ring (203) and a limiting ring (201) are fixedly connected in the sleeve (2), a spring (202) is sleeved on the main shaft (21) between the fixing ring (203) and the end block (22), the limiting ring (201) is located between the fixing ring (203) and the end block (22), the outer diameter of the end block (22) is larger than the inner diameter of the limiting ring (201), and the outer diameter of the spring (202) is smaller than the inner diameter of the limiting ring (201).

5. The position lever device for adjusting the upper and lower limit pointers of a pressure gauge according to claim 4, characterized in that: A biting blade (205) is provided on the circumference of the outer wall of the main shaft (21), and the biting blade (205) corresponds to the rubber sleeve (206).

6. A lever device for adjusting the position of the upper and lower limit pointers of a pressure gauge according to claim 5, characterized in that: A front cover (204) is provided at one end of the sleeve (2), the rubber sleeve (206) is connected to the front cover (204), a cable tie (3) is provided on the rubber sleeve (206), one end of the cable tie (3) passes through the sleeve (2) to the outside of the sleeve (2), and the tightness of the rubber sleeve (206) is adjusted by pulling one end of the cable tie (3).

7. The position lever device for adjusting the upper and lower limit pointers of a pressure gauge according to claim 5, characterized in that: A connecting rod (208) is fixedly connected to the outer periphery of the main shaft (21), a tightening sleeve (207) is fixedly connected to the connecting rod (208), and the tightening sleeve (207) is sleeved on the rubber sleeve (206).

8. The position lever device for adjusting the upper and lower limit pointers of a pressure gauge according to claim 1, characterized in that: A knob (209) is mounted on one end of the main shaft (21) away from the transparent housing (1) of the pressure gauge.

9. The position lever device for adjusting the upper and lower limit pointers of a pressure gauge according to claim 8, characterized in that: The sleeve (2) is mounted on the transparent housing (1) of the pressure gauge via screws (4).

10. A method for adjusting the position of the upper and lower limit pointers of a pressure gauge, using the position of the upper and lower limit pointers of a pressure gauge according to claim 6, characterized in that: The following steps are involved: S1, push the main shaft (21) close to the transparent housing (1) of the pressure gauge, and when pushing the main shaft (21), simultaneously push the sleeve rod (25) to make the lever member (27) close to the upper and lower limit pointers; S2, when the lever member (27) is rotated significantly, after pushing the sleeve rod (25), the main shaft (21) is pulled back, so that the end block (22) on the main shaft (21) is separated from the end tube (20); S3. When fine adjustment is performed to rotate the lever member (27), after pushing the sleeve rod (25) and causing the spacing teeth (221) to engage with the spacing grooves (200), the main shaft (21) is rotated to perform fine adjustment.

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