Electric contact pressure gauge with alarm function

Abstract

The invention relates to the field of electro connecting pressure gauges, in particular to an electro connecting pressure gauge with an alarm function, which comprises an external pipeline connected with an external pressure pipeline, the outer end face of the external pipeline is fixedly connected with a dial plate, and a transparent shield is embedded and matched on the dial plate; the pointer adjusting mechanism is used for adjusting the position of the pointer, and the pointer adjusting mechanism is arranged in the center of the transparent shield; the pointer mechanism is used for carrying out alarm processing when an upper limit is exceeded or a lower limit is lower, and the pointer mechanism is arranged on the dial plate and is protected by the transparent protective cover; wherein the pointer adjusting mechanism comprises a circular groove, the circular groove is formed in the top of the transparent protective cover, and according to the electric contact pressure gauge with the alarm function, a friction damper (such as metal sheet contact friction) is arranged on a reset path, vibration energy is consumed through friction, and impact and residual vibration of the second bourdon tube in the reset process are reduced.

Description

Technical Field

[0001] This invention relates to the field of electric contact pressure gauges, specifically an electric contact pressure gauge with an alarm function. Background Technology

[0002] Electrical contact pressure gauges are widely used in petroleum, chemical, metallurgical, power plant, and machinery industries, or in the installation of electromechanical equipment, to measure the pressure of various non-explosive fluid media. Typically, when used with appropriate electrical components (such as relays and frequency converters), the instrument can automatically control and send signals (alarms) for various gaseous and liquid media under measured (controlled) pressure.

[0003] The existing electric contact pressure gauges have the following problems: The traditional method for adjusting the upper and lower limit pointers is to rotate the push button to deflect the pointers and adjust them. However, during this process, the operator's hand may shake, causing the pointers to not be adjusted to the intended position, requiring multiple adjustments. Summary of the Invention

[0004] The present invention provides an electrical contact pressure gauge with an alarm function to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an electric contact pressure gauge with an alarm function, comprising an external pipe for connecting to an external pressure pipeline, wherein a dial is fixedly connected to the outer end face of the external pipe, and a transparent protective cover is embedded in the dial. A pointer adjustment mechanism for adjusting the position of the pointer is located at the center of the transparent cover; A pointer mechanism is used to trigger an alarm when the upper limit is exceeded or the lower limit is exceeded. The pointer mechanism is mounted on the dial and is protected by the transparent cover. The pointer adjustment mechanism includes a circular groove, which is opened on the top of the transparent cover. A pneumatic rod is slidably adapted inside the circular groove, and a limit sleeve is fixedly connected to the outside of the fixed end of the pneumatic rod. An adjustment button is connected to the top of the pneumatic rod via a disc component. A return spring is fixedly connected to the outside of the adjustment button. The bottom end of the return spring is fixedly connected to the top of the transparent cover. The return spring is used to reset the adjustment button.

[0006] Preferably, a connecting shaft is fixedly connected to the bottom of the adjustment button, a gear is fixedly installed on the outside of the connecting shaft, and a toggle pointer is fixedly connected to the bottom of the connecting shaft; The toggle pointer is used to adjust the pointer inside the pointer mechanism.

[0007] Preferably, a gear shaft is rotatably mounted on the top of the inner cavity of the transparent protective cover, a spring is fixedly connected to the outside of the gear shaft, and the top end of the spring is fixedly connected to the top of the inner cavity of the transparent protective cover. By pressing down the adjustment button and then rotating it, the gear meshes with the gear shaft and drives the dial pointer to rotate.

[0008] Preferably, the pointer mechanism includes a base, and a pointer assembly is fixedly mounted on the top of the base. The pointer assembly is provided with a lower limit mechanism and an upper limit mechanism.

[0009] Preferably, the pointer assembly includes a first separator disk, which is fixedly connected to the base. A relay is provided on the top of the first separator disk, and a permanent magnet is provided on the top of the relay. A terminal is threadedly connected to the outer side of the permanent magnet. The terminal block is connected to an external circuit and performs circuit control processing on the pointer mechanism.

[0010] Preferably, a core shaft is fitted onto the surface of the permanent magnet, and the bottom of the core shaft is fixedly connected to the first partition plate. A reset shaft is rotatably installed inside the first partition plate, a pressure pointer is fixedly connected to the outside of the reset shaft, and a first blocking rod is fixedly connected to the top of the pressure pointer. The pressure pointer represents the actual pressure inside the pipe.

[0011] Preferably, a Bourdon tube is fixedly connected to the outer side of the movement shaft, and a turntable is fixedly connected to the end of the Bourdon tube away from the movement shaft. The turntable is rotatably mounted on the outer side of the movement shaft, and a warning contact is fixedly connected to the outer side of the turntable, wherein the warning contact is limited and blocked by the first blocking rod. The top of the first separator plate has a notch, and a clamp is slidably fitted inside the notch. A bladder is provided on each side of the clamp.

[0012] Preferably, the upper limit mechanism includes an upper limit pointer, which is rotatably mounted on the outside of the movement shaft. A second force pointer is sleeved on the top of the upper limit pointer, and a second contact switch is fixedly connected to the bottom of the second force pointer. The second contact switch is rotatably mounted on the outside of the movement shaft, and a second blocking rod is fixedly connected to the bottom of the second contact switch.

[0013] Preferably, the lower limit mechanism includes a lower limit pointer, which is rotatably mounted on the outside of the movement shaft. A first force pointer is sleeved on the top of the lower limit pointer, and a first contact switch is fixedly connected to the bottom of the first force pointer. The permanent magnet is provided with a second partition plate, which is sleeved on the outside of the movement shaft. A tube is fixedly connected to the outside of the movement shaft. A sleeve rod is sleeved inside the tube. A soft steel ring is fixedly connected to the end of the sleeve rod away from the tube. An arc-shaped rod is fixedly connected to the outside of the soft steel ring. A second warning contact is fixedly connected to the top of the arc-shaped rod.

[0014] Preferably, a second Bourdon tube is fixedly connected to the outer side of the movement shaft, and the end of the second Bourdon tube away from the movement shaft is fixedly connected to the soft steel ring; The second separator plate has an arc-shaped groove, and a sliding plate is adapted to slide inside the arc-shaped groove. Damping plates are symmetrically connected to both sides of the sliding plate. A double-headed plate is fixedly connected to the end of the damping plate away from the sliding plate. The double-headed plate is fixedly connected to the second Bourdon tube.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. Through the meshing transmission between gears and gear shafts, the pointer can be adjusted more smoothly to adjust the lower and upper limit pointers, thus avoiding errors in the direction of adjustment of the lower and upper limit pointers caused by pointer wobbling, and preventing deviations in the upper and lower pressure.

[0016] 2. The bladder is filled with a non-Newtonian fluid. When the first alarm contact vibrates or shakes during rotation or the first Bourdon tube twists, the non-Newtonian fluid inside the bladder hardens and stops the twisting of the first Bourdon tube at that moment. When the vibration or shaking stops, the bladder returns to its initial state while the first Bourdon tube continues to compress and twist.

[0017] 3. If the pressure pointer exceeds the upper limit pointer range, the first alarm contact will be blocked by the second blocking rod and simultaneously come into contact with the second contact switch. At this time, the alarm will sound again, thus reminding the operator that the pressure in the pressure pipeline is too high and needs to be released.

[0018] 4. Install a friction damper (such as a metal sheet contact friction) on the reset path to consume vibration energy through friction, reduce the impact and residual vibration of the second Bourdon tube during reset, thereby preventing the tail end of the second Bourdon tube from swinging due to inertia, which would cause the second alarm contact to frequently switch on and off with the first contact switch at this moment, resulting in frequent start and stop of actuators such as regulating valves, alarms, and pumps. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the external structure of an electrical contact pressure gauge with alarm function according to the present invention.

[0020] Figure 2 This is a schematic diagram of the internal structure of the electric contact pressure gauge of the present invention.

[0021] Figure 3 This is a schematic diagram of the pointer adjustment mechanism of the present invention.

[0022] Figure 4 This is a schematic diagram of the bottom structure of the pointer adjustment mechanism of the present invention.

[0023] Figure 5 This is a schematic diagram of the full cross-sectional structure of the pointer adjustment mechanism of the present invention.

[0024] Figure 6 This is a schematic diagram of the pointer mechanism of the present invention.

[0025] Figure 7 This is a schematic diagram of the pointer component of the present invention.

[0026] Figure 8 This is a schematic diagram of the full cross-sectional structure of the pointer component of the present invention.

[0027] Figure 9 This is an enlarged structural schematic diagram of a component of the pointer assembly of the present invention.

[0028] Figure 10 This is a schematic diagram of the upper limit mechanism of the present invention.

[0029] Figure 11 This is a schematic diagram of the lower limit mechanism of the present invention.

[0030] Figure 12 This is an enlarged structural schematic diagram of some components of the lower limit mechanism of the present invention.

[0031] In the diagram: 1. Dial; 2. External pipe; 3. Transparent cover; 4. Pointer adjustment mechanism; 5. Pointer mechanism; 41. Circular groove; 42. Pneumatic rod; 43. Limit sleeve; 44. Adjustment button; 45. Return spring; 46. Connecting shaft; 47. Gear; 48. Pointer actuation mechanism; 49. Gear shaft; 40. Spring; 51. Base; 52. Pointer assembly; 53. Lower limit mechanism; 54. Upper limit mechanism; 61. Relay; 62. Permanent magnet; 63. Terminal block; 64. Movement shaft; 65. Pressure pointer; 66. No. 1 barrier rod; 67. No. 1 Bourdon tube. 68. Turntable; 69. Alarm Contact No. 1; 60. Body; 601. Clamping Plate; 602. Divider Plate No. 1; 603. Reset Shaft; 71. Lower Limit Indicator; 72. Force Indicator No. 1; 73. Contact Switch No. 1; 74. Divider Plate No. 2; 75. Tube Sleeve; 76. Sleeve Rod; 77. Soft Steel Ring; 78. Bourdon Tube No. 2; 79. Arc Rod; 70. Alarm Contact No. 2; 81. Upper Limit Indicator; 82. Force Indicator No. 2; 83. Contact Switch No. 2; 84. Barrier Rod No. 2; 91. Arc Groove; 92. Slide Plate; 93. Damping Plate; 94. Double-Ended Plate. Detailed Implementation

[0032] The present invention will now be further described with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. It should be understood that the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] Please see Figures 1 to 12 The present invention provides a technical solution: such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, it includes an external pipe 2 for connecting to an external pressure pipe, that is, the external pipe 2 is connected to different components such as boilers and reactors that need to measure pressure through the pressure pipe; a dial 1 is fixedly connected to the outer end face of the external pipe 2, and a transparent protective cover 3 is embedded on the dial 1; the transparent protective cover 3 is a cover made of glass or transparent plastic shell. The pointer adjustment mechanism 4 is used to adjust the position of the pointer, and the pointer adjustment mechanism 4 is located at the center of the transparent cover 3; The pointer mechanism 5 is used to trigger an alarm when the upper limit is exceeded or the lower limit is exceeded. The pointer mechanism 5 is set on the dial 1 and is protected by a transparent cover 3.

[0034] The pointer adjustment mechanism 4 includes a circular groove 41, which is located on the top of the transparent cover 3. A pneumatic rod 42 is slidably fitted inside the circular groove 41, and a limit sleeve 43 is fixedly connected to the outer side of the fixed end of the pneumatic rod 42. The pneumatic rod 42 serves to buffer the adjustment button 44 during the reset process, preventing excessive friction caused by moving it up and down too quickly.

[0035] The top of the pneumatic rod 42 is connected to an adjustment button 44 via a disc. A return spring 45 is fixedly connected to the outside of the adjustment button 44. The bottom end of the return spring 45 is fixedly connected to the top of the transparent cover 3. The return spring 45 is used to reset the adjustment button 44. The elastic force and torsional force of the return spring 45 and the spring 40 are less than the meshing transmission force between the gear 47 and the gear shaft 49. In other words, during the meshing process of the gear 47 and the gear shaft 49, the elastic force and torsional force of the return spring 45 and the spring 40 will not affect the operator's pressing and twisting, and there will be no problem of the elastic force of the return spring 45 and the spring 40 causing the pointer 48 to shake.

[0036] A connecting shaft 46 is fixedly connected to the bottom of the adjustment button 44, a gear 47 is fixedly installed on the outside of the connecting shaft 46, and a toggle pointer 48 is fixedly connected to the bottom of the connecting shaft 46. The toggle pointer 48 is used to adjust the pointer inside the pointer mechanism 5; A gear shaft 49 is rotatably mounted on the top of the inner cavity of the transparent cover 3. A spring 40 is fixedly connected to the outside of the gear shaft 49, and the top of the spring 40 is fixedly connected to the top of the inner cavity of the transparent cover 3. By embedding the transparent cover 3 on the dial 1, the transparent cover 3 serves to protect the pointer. Then, the operator first presses down the adjustment button 44, causing the return spring 45 to compress downward. At the same time, the gear 47 and the pointer 48, which are connected to the bottom of the adjustment button 44 through the connecting shaft 46, will move downward synchronously. At this time, the gear 47 will be at the same height as the gear that was not initially at the same height. When shaft 49 is engaged, the operator rotates the adjustment button 44 clockwise. The return spring 45 twists, and simultaneously, gear 47 engages with gear shaft 49. Spring 40, connected to gear shaft 49, also twists. Finally, pointer 48 deflects via connecting shaft 46, actuating force pointers 72 and 82 respectively. This adjusts the lower limit pointer 71 and upper limit pointer 81, thus regulating the upper and lower pressure limits of the electrical contact pressure gauge. Furthermore, the engagement between gear 47 and gear shaft 49 allows pointer 48 to more smoothly adjust the lower and upper limit pointers 71 and 81, preventing directional errors caused by pointer 48 wobbling and ensuring proper adjustment of the upper and lower pressure limits.

[0037] By pressing down and then rotating the adjustment button 44, the gear 47 meshes with the gear shaft 49 and drives the dial pointer 48 to rotate.

[0038] like Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, the pointer mechanism 5 includes a base 51, and a pointer assembly 52 is fixedly installed on the top of the base 51. The pointer assembly 52 is provided with a lower limit mechanism 53 and an upper limit mechanism 54 respectively.

[0039] The pointer assembly 52 includes a first divider 602, which is fixedly connected to the base 51. A relay 61 is provided on the top of the first divider 602, and a permanent magnet 62 is provided on the top of the relay 61. A terminal 63 is threadedly connected to the outer side of the permanent magnet 62. Terminal 63 is connected to external circuitry and provides circuit control for pointer mechanism 5. The surface of the permanent magnet 62 is fitted with a mechanism shaft 64, and the bottom of the mechanism shaft 64 is fixedly connected to the first partition plate 602. The first partition plate 602 is rotatably installed with a reset shaft 603. The outside of the reset shaft 603 is fixedly connected with a pressure pointer 65, and the top of the pressure pointer 65 is fixedly connected with a first blocking rod 66. The pressure pointer 65 represents the actual pressure inside the pipe. A Bourdon tube 67 is fixedly connected to the outer side of the movement shaft 64. A turntable 68 is fixedly connected to the end of the Bourdon tube 67 away from the movement shaft 64. The turntable 68 is rotatably mounted on the outer side of the movement shaft 64. An alarm contact 69 is fixedly connected to the outer side of the turntable 68, and the alarm contact 69 is limited and blocked by a stop bar 66. By energizing the electric contact pressure gauge and filling the pressure pipe connected to the external pipe 2 with pressure, the pressure pointer 65 will move through the reset shaft 603. A clockwise deflection occurs, where the first warning contact 69 is rotatably mounted on the movement shaft 64 via the turntable 68. At the same time, the first Bourdon tube 67 provides a torsional force to the first warning contact 69, so that the first warning contact 69 will always be in contact with the outside of the first blocking rod 66. Therefore, when the pressure pointer 65 rotates clockwise with the first blocking rod 66, the first warning contact 69 will rotate clockwise synchronously under the torsional force of the first Bourdon tube 67 and remain in close contact with the outside of the first blocking rod 66.

[0040] The top of the first partition plate 602 has a notch, and a clamping plate 601 is slidably fitted inside the notch. A bladder 60 is provided on each side of the clamping plate 601. When the first alarm contact 69 rotates clockwise, the first Bourdon tube 67 will simultaneously compress and twist. During this process, each layer of spring plates in the first Bourdon tube 67 will adhere to and compress its corresponding clamping plate 601. Simultaneously, the bladders 60 on both sides of the clamping plate 600 will compress and increase in height on one side, while extending and decreasing in height on the other side. Furthermore, the bladders 60 are filled with a non-Newtonian fluid. This fluid hardens when the first alarm contact 69 vibrates or shakes during rotation or when the first Bourdon tube 67 twists, instantly limiting and stopping the twisting of the first Bourdon tube 67. When the vibration or shaking stops, the bladder 60 returns to its initial state, while the first Bourdon tube 67 continues to compress and twist.

[0041] like Figure 10 , Figure 11 and Figure 12 As shown, the upper limit mechanism 54 includes an upper limit pointer 81, which is rotatably mounted on the outside of the movement shaft 64. A second force pointer 82 is sleeved on the top of the upper limit pointer 81. A second contact switch 83 is fixedly connected to the bottom of the second force pointer 82. The second contact switch 83 is rotatably mounted on the outside of the movement shaft 64. A second blocking rod 84 is fixedly connected to the bottom of the second contact switch 83.

[0042] The lower limit mechanism 53 includes a lower limit pointer 71, which is rotatably mounted on the outside of the movement shaft 64. A first force pointer 72 is sleeved on the top of the lower limit pointer 71, and a first contact switch 73 is fixedly connected to the bottom of the first force pointer 72. A second separator plate 74 is installed on the permanent magnet 62. The second separator plate 74 is sleeved on the outside of the movement shaft 64. A sleeve 75 is fixedly connected to the outside of the movement shaft 64. A sleeve rod 76 is sleeved inside the sleeve 75. A flexible steel ring 77 is fixedly connected to the end of the sleeve rod 76 away from the sleeve 75. An arc-shaped rod 79 is fixedly connected to the outside of the flexible steel ring 77. A second alarm contact 70 is fixedly connected to the top of the arc-shaped rod 79. When the first blocking rod 66 continues to rotate and squeezes and pushes the arc-shaped rod 79, it interacts with the arc-shaped rod. The second alarm contact 70, connected to 79, is no longer in contact with the first contact switch 73, and the alarm sound will be turned off accordingly. Therefore, the non-Newtonian fluid inside the capsule 60 acts as follows: it allows the first blocking rod 66 to smoothly move the second alarm contact 70 away from the first contact switch 73. At this time, the first alarm contact 69 and the second alarm contact 70 are respectively located on both sides of the first blocking rod 66, and the pressure pointer 65 is within the fan-shaped area between the upper limit pointer 81 and the lower limit pointer 71. If the pressure pointer 65 exceeds the range of the upper limit pointer 81, the first alarm contact 69 will be blocked by the second blocking rod 84 and simultaneously contact the second contact switch 83. The alarm will then sound again, thus alerting the operator that the pressure pipeline is overfilled and requires depressurization.

[0043] A second Bourdon tube 78 is fixedly connected to the outside of the movement shaft 64, and the end of the second Bourdon tube 78 away from the movement shaft 64 is fixedly connected to the soft steel ring 77. The second partition plate 74 has an arc-shaped groove 91, inside which a sliding plate 92 is fitted. Damping plates 93 are symmetrically connected to both sides of the sliding plate 92. A double-ended plate 94 is fixedly connected to the end of the damping plate 93 away from the sliding plate 92, and the double-ended plate 94 is fixedly connected to the second Bourdon tube 78. Conversely, when the pressure inside the pressure pipeline decreases, and the pressure pointer 65 falls below the lower limit pointer 71, the second alarm contact 70 will re-engage with the first contact switch 73, and the alarm will sound again. The arc-shaped rod 79 is connected to the second Bourdon tube 78 via a flexible steel ring 77. Therefore, during the reset process of the second alarm contact 70 and the arc-shaped rod 79, the second Bourdon tube 78 will expand and reset. During the reset process, the double-ended plate 94 connected to the second Bourdon tube 78 will dampen the damping plate 93. During the compression, the slide plate 92 moves to the right along the arc groove 91, thereby setting up a friction damper, such as a metal sheet, on the reset path to consume vibration energy through friction, reduce the impact and residual vibration of the second Bourdon tube 78 during reset, and prevent the tail end of the second Bourdon tube 78 from swinging due to inertia, which would cause the second alarm contact 70 to frequently switch on and off with the first contact switch 73 at this moment, thus causing the actuators such as regulating valves, alarms, and pumps to frequently start and stop.

[0044] In use, the present invention is as follows: First, the transparent cover 3 is embedded in the dial 1. Then, the operator presses down the adjustment button 44, causing the return spring 45 to compress downward. At the same time, the gear 47 and the toggle pointer 48, which are connected to the bottom of the adjustment button 44 via the connecting shaft 46, move downward synchronously. At this time, the gear 47 will mesh with the gear shaft 49, which is not initially at the same height. Finally, the operator rotates the adjustment button 44 in the forward direction. The return spring 45 will twist, and the gear 47 will mesh with the gear shaft 49. In addition, the spring 40 connected to the gear shaft 49 will also twist. Finally, the toggle pointer 48 will deflect via the connecting shaft 46 and move the first force pointer 72 and the second force pointer 82 respectively. At the same time, the direction of the lower limit pointer 71 and the upper limit pointer 81 will be adjusted respectively.

[0045] Once the upper and lower pressure limits are determined, the four terminals 63 are connected to external wires. The terminals 63 are threaded to the other four permanent magnets 62. The different terminals 63 are explained from bottom to top. The bottom terminal 63 is called the first layer terminal. The first layer terminal is connected to the line of the upper limit pointer 81. The second layer terminal is connected to the line of the lower limit pointer 71. The third layer terminal is connected to the common line that the upper limit pointer 81 and the lower limit pointer 71 are in contact with. The fourth layer terminal is connected to the ground wire. By energizing the pressure gauge and filling the pressure pipe connected to the external pipe 2 with pressure, the pressure pointer 65 will deflect clockwise through the reset shaft 603. The first alarm contact 69 is rotatably mounted on the movement shaft 64 via the turntable 68. At the same time, the first Bourdon tube 67 will give the first alarm contact 69 a torsional force, so that the first alarm contact 69 will always be in contact with the outside of the first blocking rod 66. Therefore, when the pressure pointer 65 rotates clockwise with the first blocking rod 66, the first alarm contact 69 will rotate clockwise synchronously under the torsional force of the first Bourdon tube 67 and remain in close contact with the outside of the first blocking rod 66. When the first blocking rod 66 continues to rotate and presses against the arc-shaped rod 79, the second alarm contact 70, connected to the arc-shaped rod 79, will no longer be in contact with the first contact switch 73, and the alarm sound will be turned off accordingly. At this time, the first alarm contact 69 and the second alarm contact 70 are respectively set on both sides of the first blocking rod 66, and the pressure pointer 65 will be in the fan-shaped area between the upper limit pointer 81 and the lower limit pointer 71. If the pressure pointer 65 exceeds the range of the upper limit pointer 81, the first alarm contact 69 will be blocked by the second blocking rod 84 and will make contact with the second contact switch 83, at which point the alarm will sound again.

[0046] Conversely, when the pressure inside the pressure pipeline decreases and the pressure pointer 65 is lower than the lower limit pointer 71, the second alarm contact 70 will re-engage with the first contact switch 73, and the alarm will sound again. The arc rod 79 is connected to the second Bourdon tube 78 through the soft steel ring 77. Therefore, during the reset process of the second alarm contact 70 and the arc rod 79, the second Bourdon tube 78 will expand and reset.

[0047] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made by those skilled in the art based on the above concepts without creative effort shall fall within the scope of protection of the present invention.

Claims

1. An electrical contact pressure gauge with an alarm function, characterized in that, include: An external pipe for connecting to an external pressure pipeline, wherein a dial is fixedly connected to the outer end face of the external pipe, and a transparent protective cover is embedded on the dial. A pointer adjustment mechanism for adjusting the position of the pointer is located at the center of the transparent cover; A pointer mechanism is used to trigger an alarm when the upper limit is exceeded or the lower limit is exceeded. The pointer mechanism is mounted on the dial and is protected by the transparent cover. The pointer adjustment mechanism includes a circular groove, which is opened on the top of the transparent cover. A pneumatic rod is slidably adapted inside the circular groove, and a limit sleeve is fixedly connected to the outside of the fixed end of the pneumatic rod. An adjustment button is connected to the top of the pneumatic rod via a disc component. A return spring is fixedly connected to the outside of the adjustment button. The bottom end of the return spring is fixedly connected to the top of the transparent cover. The return spring is used to reset the adjustment button.

2. The electric contact pressure gauge with alarm function according to claim 1, characterized in that: The bottom of the adjustment button is fixedly connected to a connecting shaft, a gear is fixedly installed on the outside of the connecting shaft, and a toggle pointer is fixedly connected to the bottom of the connecting shaft. The toggle pointer is used to adjust the pointer inside the pointer mechanism.

3. The electrical contact pressure gauge with alarm function according to claim 2, characterized in that: A gear shaft is rotatably mounted on the top of the inner cavity of the transparent protective cover, and a spring is fixedly connected to the outside of the gear shaft. The top end of the spring is fixedly connected to the top of the inner cavity of the transparent protective cover. By pressing down the adjustment button and then rotating it, the gear meshes with the gear shaft and drives the dial pointer to rotate.

4. The electric contact pressure gauge with alarm function according to claim 1, characterized in that: The pointer mechanism includes a base, on the top of which a pointer assembly is fixedly mounted. The pointer assembly is provided with a lower limit mechanism and an upper limit mechanism.

5. The electrical contact pressure gauge with alarm function according to claim 4, characterized in that: The pointer assembly includes a first separator disk, which is fixedly connected to the base. A relay is provided on the top of the first separator disk, and a permanent magnet is provided on the top of the relay. A terminal is threadedly connected to the outer side of the permanent magnet. The terminal block is connected to an external circuit and performs circuit control processing on the pointer mechanism.

6. The electric contact pressure gauge with alarm function according to claim 4, characterized in that: The permanent magnet is fitted with a core shaft, and the bottom of the core shaft is fixedly connected to the first partition plate. A reset shaft is rotatably installed inside the first partition plate. A pressure pointer is fixedly connected to the outside of the reset shaft. A first blocking rod is fixedly connected to the top of the pressure pointer. The pressure pointer represents the actual pressure inside the pipe.

7. The electrical contact pressure gauge with alarm function according to claim 6, characterized in that: A Bourdon tube is fixedly connected to the outside of the movement shaft. A turntable is fixedly connected to the end of the Bourdon tube away from the movement shaft. The turntable is rotatably mounted on the outside of the movement shaft. A warning contact is fixedly connected to the outside of the turntable. The warning contact is limited and blocked by the first blocking rod. The top of the first separator plate has a notch, and a clamp is slidably fitted inside the notch. A bladder is provided on each side of the clamp.

8. The electric contact pressure gauge with alarm function according to claim 6, characterized in that: The upper limit mechanism includes an upper limit pointer, which is rotatably mounted on the outside of the movement shaft. A second force pointer is sleeved on the top of the upper limit pointer, and a second contact switch is fixedly connected to the bottom of the second force pointer. The second contact switch is rotatably mounted on the outside of the movement shaft, and a second blocking rod is fixedly connected to the bottom of the second contact switch.

9. The electric contact pressure gauge with alarm function according to claim 6, characterized in that: The lower limit mechanism includes a lower limit pointer, which is rotatably mounted on the outside of the movement shaft. A first force pointer is sleeved on the top of the lower limit pointer, and a first contact switch is fixedly connected to the bottom of the first force pointer. The permanent magnet is provided with a second partition plate, which is sleeved on the outside of the movement shaft. A tube is fixedly connected to the outside of the movement shaft. A sleeve rod is sleeved inside the tube. A soft steel ring is fixedly connected to the end of the sleeve rod away from the tube. An arc-shaped rod is fixedly connected to the outside of the soft steel ring. A second warning contact is fixedly connected to the top of the arc-shaped rod.

10. The electrical contact pressure gauge with alarm function according to claim 9, characterized in that: A second Bourdon tube is fixedly connected to the outside of the movement shaft, and the end of the second Bourdon tube away from the movement shaft is fixedly connected to the soft steel ring. The second separator plate has an arc-shaped groove, and a sliding plate is adapted to slide inside the arc-shaped groove. Damping plates are symmetrically connected to both sides of the sliding plate. A double-headed plate is fixedly connected to the end of the damping plate away from the sliding plate. The double-headed plate is fixedly connected to the second Bourdon tube.

Images