Pressure gauge movement

Abstract

The pressure gauge movement comprises an upper clamping plate, a lower clamping plate and a connecting piece, a central rotating shaft and a fan tooth shaft are arranged between the upper clamping plate and the lower clamping plate, a central gear and a hairspring are arranged on the central rotating shaft, a fan tooth swing arm is arranged on the fan tooth shaft, and fan teeth meshed with the central gear are arranged at one end of the fan tooth swing arm; the two ends of the connecting piece are connected with the upper clamping plate and the lower clamping plate respectively, a first fixing buckle is arranged on the connecting piece and provided with a first buckle groove, the first buckle groove is provided with a clamping piece in a matched mode, a limiting groove is formed in the inner wall of the first buckle groove, and the outer end of the hairspring extends into the limiting groove and is fixed through the clamping piece. According to the utility model, the installation of the hairspring is not influenced by the position change in the vertical direction, the assembly difficulty of the hairspring can be reduced, the assembly precision of the hairspring can be improved, the detection precision of the movement of the pressure gauge is further improved, and the manual debugging cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to pressure gauge technical field, concretely relates to a pressure gauge movement. BACKGROUND

[0002] The movement is a pressure transmission element inside the pressure gauge, which can convert the linear displacement of the free end of the spring tube of the pressure gauge into angular displacement, amplify the small displacement of the spring tube, and make the pointer obtain a larger rotation angle proportional to the measured pressure, so as to ensure the reading accuracy of the pressure gauge and achieve the purpose of easy observation of the indicated value.

[0003] The utility model discloses a convenient to install's pressure detection device, including support plate and support strip, support plate and support strip are fixed together through fixed part, fixed part includes fixed clamping needle, two boss are fixedly connected on the support plate, two extrusion parts are connected on the two boss, two extrusion tubes are fixedly connected on the support strip, two extrusion tubes are communicated with two extrusion holes respectively, the connecting rod is rotatably connected on the support strip, the support plate is seted up with through -hole, the connecting rod passes through the through -hole on the support plate, the connecting rod is fixedly connected with fan tooth, the rotating rod is rotatably connected on the support strip, the rotating rod passes through the through -hole on the support plate, the rotating rod coaxially fixedly connected with the bar gear, the rotating rod coaxially fixedly connected with the hairspring, the end of the hairspring away from the rotating rod is connected with an extrusion part, and the fan tooth is engaged with the bar gear. The fixed clamping needle provided by the scheme is not easy to loosen under the extrusion of the extrusion part, the movement is firm, and the detection accuracy is high.

[0004] The hairspring on the pressure gauge needs to be kept horizontal during assembly, so that the detection of pressure can maintain reasonable accuracy. The above patent document connects the end of the hairspring away from the rotating rod with the extrusion part, and the fixed clamping needle extrudes the extrusion part, and the extrusion part extrudes the extrusion tube, so that the support rod and the support plate are fixed together. Because the fixed clamping needle and the extrusion part are pressed during assembly, the end of the hairspring is easy to change in the vertical direction, and the hairspring is difficult to keep horizontal, resulting in reduced pressure detection accuracy, which needs to be adjusted manually. Utility model content

[0005] The utility model aims at providing a pressure gauge movement, which solves the above problems in the prior art.

[0006] In order to achieve the above object, the utility model discloses the following technical scheme: a pressure gauge movement, including upper clamping plate, lower clamping plate and connecting piece, be equipped with center pivot and fan tooth shaft between the upper clamping plate and lower clamping plate, be equipped with center gear and hairspring on the center pivot, be equipped with fan tooth swing arm on the fan tooth shaft, the one end of fan tooth swing arm is equipped with the fan tooth that is interlocked with center gear;The both ends of connecting piece are linked with upper clamping plate and lower clamping plate respectively, and the first fixed buckle is equipped on the connecting piece, and the first fixed buckle is equipped with the first buckle groove, and the first buckle groove is equipped with the clamping piece, and the limit groove is opened in the inner wall of first buckle groove, and the outer end of hairspring is inserted into the limit groove and is fixed through clamping piece.

[0007] As an optional implementation of the above technical solution, the clamping piece includes a clamping column, which is clamped in the first buckle groove and tightly fixes the hairspring.

[0008] As an optional implementation of the above technical solution, the lower clamping plate is provided with a second fixed buckle, and the second fixed buckle is provided with a second buckle groove matched with the clamping column.

[0009] As an optional implementation of the above technical solution, the connecting piece includes a connecting column, and the first fixed buckle is arranged on the surface of the connecting column.

[0010] As an optional implementation of the above technical solution, the lower clamping plate is provided with a connecting sleeve, and the connecting column and the connecting sleeve are mutually sleeved.

[0011] As an optional implementation of the above technical solution, the outer side of the center pivot is sleeved with a mounting sleeve, and the center gear is arranged on the mounting sleeve.

[0012] As an optional implementation of the above technical solution, the center pivot is provided with a fixing disc, the fixing disc is provided with a mounting groove along the circumference, and the hairspring is sleeved on the fixing disc and the inner end of the hairspring is fixed in the mounting groove.

[0013] As an optional implementation of the above technical solution, the lower clamping plate is provided with a mounting column, and one end of the fan tooth shaft is inserted into the mounting column.

[0014] As an optional implementation of the above technical solution, the fan tooth swing arm is provided with a connecting sleeve pipe matched with the fan tooth shaft in rotation, the fan tooth swing arm is made of metal material, and the fan tooth swing arm, the connecting sleeve pipe and the fan tooth are integrally formed by injection molding.

[0015] As an optional implementation form of the above technical solution, the fan teeth are provided with a thickened structure; the thickness of the fan teeth is greater than the thickness of the fan tooth swing arm.

[0016] The utility model discloses the beneficial effects are:

[0017] The utility model provides a pressure gauge movement, including upper clamping plate, lower clamping plate and connecting piece, be equipped with first fixed buckle on the connecting piece, first fixed buckle is equipped with first buckle slot, first buckle slot is equipped with clamping piece, and the first buckle slot inner wall is set up and is limited to the groove, the outer end of hairspring inserts into the limited groove and is fixed through clamping piece. In the assembly process of pressure gauge movement, the terminal end of hairspring inserts into the limited groove, and clamping piece is installed on fixed buckle, and clamping piece is pressed tightly fixed to the terminal end of hairspring, thereby avoiding the phenomenon that the position of hairspring changes in vertical direction in the assembly process, so that hairspring keeps the horizontal state. The utility model is not affected by the influence of vertical position change when installing hairspring, can alleviate the assembly difficulty of hairspring, and can improve the assembly precision of hairspring, and then improve the detection precision of pressure gauge movement, and reduce the cost of manual debugging. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the structure schematic diagram of pressure gauge movement in first visual angle in an embodiment of the utility model;

[0019] Figure 2 It is the structure schematic diagram of pressure gauge movement in second visual angle in an embodiment of the utility model;

[0020] Figure 3 It is the structure schematic diagram of upper clamping plate in an embodiment of the utility model;

[0021] Figure 4 It is the structure schematic diagram of lower clamping plate in an embodiment of the utility model;

[0022] Figure 5 It is the structure schematic diagram of center pivot and center gear in an embodiment of the utility model;

[0023] Figure 6 It is the structure schematic diagram of fan tooth shaft in an embodiment of the utility model;

[0024] Figure 7 It is the structure schematic diagram of hairspring and fixed disc in an embodiment of the utility model;

[0025] Figure 8 It is the structure schematic diagram of fan tooth swing arm and fan tooth in an embodiment of the utility model.

[0026] In the diagram: 1-Upper clamping plate; 2-Lower clamping plate; 3-Central rotating shaft; 4-Sector tooth shaft; 5-Central gear; 6-Hairspring; 7-Sector tooth swing arm; 8-Sector tooth; 9-First fixing buckle; 10-First buckle groove; 11-Limiting groove; 12-Clamping post; 13-Second fixing buckle; 14-Second buckle groove; 15-Connecting post; 16-Connecting sleeve; 17-Mounting sleeve; 18-Fixing plate; 19-Mounting post; 20-Connecting sleeve. Detailed Implementation

[0027] like Figures 1-8 As shown, this embodiment provides a pressure gauge movement, including an upper plate 1, a lower plate 2, and a connecting piece. A central rotating shaft 3 and a sector tooth shaft 4 are provided between the upper plate 1 and the lower plate 2. A central gear 5 and a hairspring 6 are provided on the central rotating shaft 3. The sector tooth shaft 4 is made of metal and has a sector tooth swing arm 7. One end of the sector tooth swing arm 7 has a sector tooth 8 that meshes with the central gear 5. The sector tooth 8 has a thickened structure; the thickness of the sector tooth 8 is greater than the thickness of the sector tooth swing arm 7. By setting the central gear 5 and the sector tooth 8, when the Bourdon tube of the pressure gauge undergoes linear displacement, the Bourdon tube drives the sector tooth swing arm 7 to rotate. The sector tooth 8 rotates with the sector tooth swing arm 7, and the sector tooth 8 drives the central gear 5 to rotate. The central gear 5 drives the pressure gauge pointer to rotate through the central rotating shaft 3, thereby displaying the pressure. The hairspring 6 drives the pressure gauge pointer to rotate and reset through the central rotating shaft 3.

[0028] The two ends of the connector are respectively connected to the upper clamping plate 1 and the lower clamping plate 2, and the connector is provided with a first fixing buckle 9. Figure 3 As shown, the first fixing buckle 9 is provided with a first buckle groove 10, the first buckle groove 10 is equipped with a clamping member, and a limiting groove 11 is opened on the inner wall of the first buckle groove 10. The outer end of the hairspring 6 extends into the limiting groove 11 and is fixed by the clamping member.

[0029] During the assembly of the pressure gauge movement, the end of the hairspring 6 is inserted into the limiting groove 11, and the clamping component is installed on the fixing buckle. The clamping component presses and fixes the end of the hairspring 6, thereby preventing the hairspring 6 from changing its vertical position during the assembly process and keeping the hairspring 6 in a horizontal state. This utility model is not affected by changes in the vertical position when installing the hairspring 6, which can reduce the assembly difficulty of the hairspring 6 and improve the assembly accuracy of the hairspring 6, thereby improving the detection accuracy of the pressure gauge movement and reducing the cost of manual adjustment.

[0030] like Figure 1 As shown, in one specific embodiment, the clamping member includes a clamping post 12, which is engaged in the first retaining groove 10 and presses and fixes the hairspring 6. The clamping post 12 is cylindrical and can easily and quickly engage with the first fixing buckle 9 to fix the end of the hairspring 6.

[0031] As Figure 4 shown, in order to improve the installation stability of the clamping column 12, the lower clamping plate 2 is provided with a second fixing buckle 13, and the second fixing buckle 13 is provided with a second buckle groove 14 matched with the clamping column 12; the lower clamping plate 2 and the second fixing buckle 13 are integrally formed by injection molding. The second buckle groove 14 and the first buckle groove 10 are on the same straight line, one end of the clamping column 12 is clamped into the first buckle groove 10, and the other end of the clamping column 12 is clamped into the second buckle groove 14, so as to realize the fixation of the clamping column 12.

[0032] Specifically, the connecting piece includes a connecting column 15, and the surface of the connecting column 15 is provided with the first fixing buckle 9, and the first buckle groove 10 is arranged along the length direction of the connecting column 15; the upper clamping plate 1, the connecting column 15 and the first fixing buckle 9 are integrally formed by injection molding. One end of the connecting column 15 is connected with the upper clamping plate 1, and the other end of the connecting column 15 is connected with the lower clamping plate 2; the outer wall of the connecting column 15 is provided with the first fixing buckle 9, the clamping column 12 cooperates with the first fixing buckle 9, and the horizontal fixation of the hairspring 6 is realized.

[0033] Among them, the lower clamping plate 2 is provided with a connecting sleeve 16, and the connecting column 15 and the connecting sleeve 16 are mutually sleeved, which is beneficial to the disassembly and assembly of the pressure gauge movement.

[0034] As Figure 5 shown, in a specific embodiment, the outer side of the central rotating shaft 3 is provided with a mounting sleeve 17, and the central gear 5 is arranged on the mounting sleeve 17; the central rotating shaft 3, the mounting sleeve 17 and the central gear 5 are integrally formed by injection molding. As Figure 7 shown, the central rotating shaft 3 is provided with a fixing disc 18, the fixing disc 18 is provided with a mounting groove in the circumferential direction, and the hairspring 6 is sleeved on the fixing disc 18 and the inner end of the hairspring 6 is fixed in the mounting groove. The mounting groove fixes the hairspring 6, reduces the shaking of the hairspring 6 in the vertical direction, and thus improves the instrument precision.

[0035] As Figure 4 shown, the lower clamping plate 2 is provided with a mounting column 19, and one end of the fan tooth shaft 4 is inserted into the mounting column 19. As Figure 8 shown, the fan tooth swing arm 7 is provided with a connecting sleeve 20 which rotates with the fan tooth shaft 4; the fan tooth swing arm 7, the connecting sleeve 20 and the fan tooth 8 are integrally formed by injection molding. The fan tooth shaft 4 is made of metal material, the fan tooth shaft 4 rotates with the connecting sleeve 20, one end of the fan tooth shaft 4 is connected with the upper clamping plate 1, and the other end of the fan tooth shaft 4 is inserted into the mounting column 19 on the lower clamping plate 2. The surface of the fan tooth shaft 4 is smooth, and the smoothness is high, which can greatly reduce the friction between the fan tooth shaft 4 and the connecting sleeve 20, and can simplify the assembly process of the pressure gauge movement.

[0036] Compared with the prior art, the utility model has the following advantages:

[0037] One, the "oil-free shock resistance" pressure gauge core can be popularized in various specifications of pressure gauge series products, because the pressure gauge core of the prior art is made of metal material, which has large density, high elastic modulus and is easy to vibrate, the pressure gauge core formed by injection molding can be widely applied to other pressure gauge specifications, because the vibration effect of the plastic molecular structure is better, and the third party detection can meet the standard of GJB150.16A-2009 "military equipment laboratory environmental test method part 16: vibration test". Generally, the larger the material density, the higher the material elastic modulus, and the higher the vibration transmission efficiency. And the plastic is usually used as a sound insulation vibration material, and inspiration is obtained from it. For example, the material characteristics are more remarkable in the engineering field of shock resistance, and the incoming vibration signal is weakened. The developed pressure gauge core can play the role of oil-free shock resistance in engineering plastics, and the use of soft and hard materials in the product design structure greatly reduces the friction and shaking, and the double tubes reach the ideal state of "oil-free shock resistance".

[0038] Two, the product structure is improved in the design, the material of the fan tooth shaft 4 is selected to be metal, and the stepless round bar shaft structure is adopted, so that the friction coefficient in the engineering plastic is greatly reduced, the smoothness is improved, and the service life of the pressure gauge core is improved by more than three times compared with the original metal core.

[0039] Three, the fan teeth 8 can be locally thickened, which is beneficial to improve the transmission stability of the fan teeth 8 and the central gear 5, so as to improve the precision of the pressure gauge.

[0040] Four, the outer end of the hairspring 6 is fixed in the limiting groove 11 (long slot or round hole joint), which greatly facilitates the accurate assembly of the hairspring 6, ensures that the hairspring 6 is installed to the horizontal position, and is beneficial to improve the accuracy and stability of the pressure gauge during work.

[0041] There are nearly one hundred varieties of pressure gauges in the prior art, which are industrial products and consumables. The state stipulates that key enterprises and departments also implement mandatory scrap. The total quantity reaches 1-2 billion per year, and the core has been used for nearly one hundred years. Non-ferrous metal copper and stainless steel are used. Therefore, the state loses thousands of tons of valuable non-ferrous metal resources and expensive silicon oil and petroleum resources for shock resistance tables every year. Copper needs electroplating treatment, and the utilization rate of metal material parts layout drawing is low, resulting in a large number of waste products, serious environmental pollution caused by electroplating, and serious influence on green environmental protection.

[0042] In order to prevent the instrument pointer from being shock-resistant in a high-frequency working environment, the pointer can obtain stable reading during work, and the case must be filled with glycerol or silicon oil to play a damping role. However, glycerol will freeze below 0℃, so only expensive silicon oil (26,000 / t) can be used.

[0043] The utility model provides a pressure gauge production new technology, and the original metal makes pressure gauge to need 34 processes, and the present one -step forming injection technology, and the product quality is improved. According to the principle that the greater the mass of an object, the lower its natural frequency, the greater the mass, the greater the inertia, the metal movement is more susceptible to vibration, and the engineering plastic can better absorb and relieve these vibrations due to its soft molecular structure. It is found in practice that the damping effect of plastic is greater than that of metal, which means that plastic loses energy faster in vibration, and the vibration amplitude will gradually decrease, while the vibration amplitude of metal is relatively persistent.

[0044] In order to make the plastic product better to achieve damping vibration effect, reduce the vibration of the pointer in the table, cooperate with the breakthrough in product design, design the instrument zero to adopt two kinds of soft and hard material transmission structure, at the same time, tighten the product hole, shaft gap tolerance and reduce the axial movement, so as to select the material and product design, further increase the "oil -free shock -resistant" instrument working time shock stability.

[0045] In the work, PPS in chemical products is suitable to replace the metal movement of pressure gauge. After years of effort, high -precision "oil -free shock -resistant" pressure gauge (attached third party recognized test report, reaching national standard, military standard GJB150-16A.2009) is successfully developed. This material has been widely used in aerospace, aviation, automobile, military industry, national defense, environmental protection, electronics, chemical industry and other important fields.

[0046] It replaces the traditional metal movement of pressure gauge for nearly a hundred years, and adopts existing senior engineering plastic PPS, which is a new type of high performance thermoplastic resin with excellent physical and chemical properties (chemical formula C6H4S)n molecular main key is alternately arranged by benzene and sulfur atom, high rigidity, high crystallinity and excellent thermal stability, barrel injection point 285-340 DEG C, density 1.34-1.36g / c㎡, one -step injection molding, so that the original metal movement 34 process parts utilize precision mold design and manufacturing, injection molding completes the assembly required high precision parts at one time, and the new material improves the working temperature of the instrument from negative 42 DEG C to 230 DEG C, and the original metal pressure gauge movement is limited to negative 40 to 70 DEG C narrow range due to thermal expansion and cold contraction.

[0047] The new process injection molding PPS material has excellent shrinkage rate, high precision and easy size control, which solves and avoids the high precision cumulative tolerance of metal parts and spare parts combination, greatly improves the assembly precision!

[0048] The upper and lower small holes and the fan tooth shaft of the original metal movement have multiple steps, and the length of the small shaft end is short and cannot be processed by a grinding machine (such as ∮1x1 or ∮1.5x1). The smoothness (roughness) can only be achieved by turning process to level 1.6. The new process design scheme is that the ∮1 or ∮1.5 shaft has no step structure, and the pulling straight process and ring polishing process can improve the smoothness by 5 levels, and the smoothness can reach level 0.025. The small hole in the mold can also use this process scheme. Since the smoothness of the hole and the shaft reaches level 0.025, which is 5 levels higher than the original metal 1.6, the friction coefficient of the hole and the shaft is significantly reduced, and the service life of the instrument is greatly improved.

[0049] The process design of the new product twists the high friction coefficient of the same material when the shaft and the hole are driven, and the hole and the shaft are made of different materials. The PPS material of the hole in the upper and lower clamping plates is soft, and the shaft is made of a hard metal insert. The friction coefficient of the different materials is greatly reduced. According to the research and development data of the plastic industry, the dynamic friction coefficient of PPS is close to 0.

[0050] The injection molding process can mix with multiple polymers or additives because the material has good compatibility. According to the actual working environment requirements of the instrument parts, the mechanical properties and other properties can be improved according to the working environment of the instrument.

[0051] The pressure gauge series product is an industrial product that is easy to wear and belongs to a state-owned key enterprise that also implements mandatory scrap. In order to achieve the purpose of resource saving, the traditional metal material manufacturing of the movement of the pressure gauge for more than 100 years must be completely revolutionized. The corresponding movement parts are injection molded into a whole through the injection molding process, which not only reduces the cumulative tolerance of each part precision, thereby meeting the high precision assembly tolerance requirement and prolonging the service life of the instrument, but also greatly simplifies the part process number from 34 processes to 1 process, thereby achieving resource saving. In order to benefit the national green environmental protection, the service life of the instrument also needs to be greatly improved. The hole and the shaft in the pressure gauge, the center tooth and the fan tooth transmission design adopt a soft and hard transmission matching structure, and the friction coefficient is close to 0.

[0052] The attached drawing only shows one specification of the pressure gauge, and the new injection molding process of the pressure gauge movement can be widely applied to the series production of the pressure gauge. The upper and lower clamping plates, the fan tooth, and the foot column of the pressure gauge can be integrated, and the ∮1 small shaft structure can be produced by the pulling straight process and the ring polishing process, which greatly improves the production efficiency and reduces the cost, and at the same time, the quality of the pressure gauge is significantly improved, and the range of use is wider. Not only is it shock resistant, but also temperature resistant, wear resistant, and corrosion resistant. The oil-free shock-resistant pressure gauge of the utility model has a factory price of only 105-120 yuan. Due to the brand effect, the market price of the same type of gauge is as high as 200-320 yuan. The new injection molding process of the series production of the pressure gauge can bring great benefits to enterprises and the country, and better provide low-cost, high-quality products for the society.

[0053] In the description of the utility model, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood broadly, can be fixed connection, detachable connection, or integrated; can be mechanical connection or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the communication between two elements or the interaction relationship of two elements, for those skilled in the art, the specific meaning of the above terms in the utility model can be understood. In addition, the specific features, structures and the like described in the embodiments are included in at least one embodiment, and the features of different embodiments can be combined by those skilled in the art without mutual contradiction. The protection scope of the utility model is not limited to the above specific embodiments, according to the basic technical concept of the utility model, the embodiments that can be thought of by those skilled in the art without creative labor all belong to the protection scope of the utility model.

Claims

1. A pressure gauge movement, comprising an upper plate (1), a lower plate (2), and a connecting member, wherein a central rotating shaft (3) and a sector tooth shaft (4) are provided between the upper plate (1) and the lower plate (2), a central gear (5) and a hairspring (6) are provided on the central rotating shaft (3), a sector tooth swing arm (7) is provided on the sector tooth shaft (4), and one end of the sector tooth swing arm (7) is provided with sector teeth (8) that mesh with the central gear (5); the two ends of the connecting member are respectively connected to the upper plate (1) and the lower plate (2), characterized in that, The connector is provided with a first fixing buckle (9), the first fixing buckle (9) is provided with a first buckle groove (10), the first buckle groove (10) is provided with a clamping member, and a limiting groove (11) is opened on the inner wall of the first buckle groove (10). The outer end of the hairspring (6) extends into the limiting groove (11) and is fixed by the clamping member.

2. The pressure gauge movement according to claim 1, characterized in that, The clamping component includes a clamping post (12), which is engaged in the first latching groove (10) and presses and fixes the hairspring (6).

3. The pressure gauge movement according to claim 2, characterized in that, The lower clamping plate (2) is provided with a second fixing buckle (13), and the second fixing buckle (13) is provided with a second buckle groove (14) that is adapted to the clamping post (12); the lower clamping plate (2) and the second fixing buckle (13) are integrally formed by injection molding.

4. The pressure gauge movement according to claim 1, characterized in that, The connector includes a connecting post (15), the surface of which is provided with the first fixing buckle (9), and the first buckle groove (10) is provided along the length direction of the connecting post (15); the upper clamping plate (1), the connecting post (15) and the first fixing buckle (9) are integrally formed by injection molding.

5. The pressure gauge movement according to claim 4, characterized in that, The lower clamping plate (2) is provided with a connecting sleeve (16), and the connecting post (15) and the connecting sleeve (16) are sleeved together.

6. The pressure gauge movement according to claim 1, characterized in that, An installation sleeve (17) is fitted on the outer side of the central rotating shaft (3), and the central gear (5) is mounted on the installation sleeve (17); the central rotating shaft (3), the installation sleeve (17) and the central gear (5) are integrally formed by injection molding.

7. The pressure gauge movement according to claim 1, characterized in that, The central rotating shaft (3) is provided with a fixed disk (18), and the fixed disk (18) is provided with an installation groove along the circumference. The hairspring (6) is sleeved on the fixed disk (18) and the inner end of the hairspring (6) is fixed in the installation groove.

8. The pressure gauge movement according to claim 1, characterized in that, The lower clamping plate (2) is provided with a mounting post (19), and one end of the fan tooth shaft (4) is inserted into the mounting post (19).

9. The pressure gauge movement according to claim 1, characterized in that, The fan tooth swing arm (7) is provided with a connecting sleeve (20) that rotates with the fan tooth shaft (4); the fan tooth shaft (4) is made of metal material; the fan tooth swing arm (7), the connecting sleeve (20) and the fan teeth (8) are integrally formed by injection molding.

10. The pressure gauge movement according to claim 1, characterized in that, The fan teeth (8) are provided with a thickened structure; the thickness of the fan teeth (8) is greater than the thickness of the fan teeth swing arm (7).

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