pressure measuring mechanism

Abstract

The application relates to the technical field of fluid pressure detection, and particularly discloses a pressure measuring mechanism for detecting fluid pressure, which comprises a measuring piece and a scale piece. The measuring piece is provided with an injection port, a pressure measuring groove arranged at intervals from the injection port, and a flow guide channel connecting the injection port and the pressure measuring groove. The groove depth of the pressure measuring groove gradually increases from one end far from the flow guide channel to one end close to the flow guide channel. The scale piece is connected with the measuring piece and covers the groove opening of the pressure measuring groove. A scale is arranged on the scale piece. The pressure measuring mechanism can reduce the detection cost of fluid pressure and improve the detection efficiency.

Description

Technical Field

[0001] This application relates to the field of fluid pressure detection technology, specifically to a pressure measuring mechanism. Background Technology

[0002] With the development of 3C electronic products such as mobile phones, product structures are becoming increasingly complex, and fluid injection molding is increasingly being used. Simultaneously, the requirements for the precision of injection pressure in the injection molding machine are also becoming more stringent. Loss of injection pressure leads to instability, thus affecting the molding quality of the product. Currently, pressure sensors are typically installed on the injection molding machine to determine the injection pressure by detecting the pressure inside the machine. However, this detection method suffers from high costs and low efficiency, making it difficult to meet actual production needs. These problems seriously affect production efficiency and product quality in actual production, necessitating a more efficient and low-cost pressure measurement mechanism. Utility Model Content

[0003] In view of the above, it is necessary to propose a pressure measuring mechanism to reduce the cost of fluid pressure detection and improve detection efficiency.

[0004] This application provides a pressure measuring mechanism for detecting fluid pressure, including:

[0005] A measuring element, comprising an injection port, a pressure measuring groove spaced apart from the injection port, and a flow guiding channel connecting the injection port and the pressure measuring groove; the depth of the pressure measuring groove gradually increases from the end furthest from the flow guiding channel to the end closest to the flow guiding channel; and

[0006] A scale element is connected to the measuring element and covers the opening of the pressure measuring groove, and a scale is provided on the scale element.

[0007] In some embodiments, the flow channel includes a first channel and a second channel, one end of the first channel is connected to the injection port, one end of the second channel is connected to the other end of the first channel, the second channel is perpendicular to the first channel, the connection between the second channel and the first channel is constructed as an arc, and the other end of the second channel is connected to one end of the pressure measuring groove.

[0008] In some embodiments, the depth of the pressure measuring tank is a variable h. When the maximum volume of fluid is stored in the injection tube of the machine, the length r from the fluid front of the pressure measuring tank to the center of the injection port is correspondingly given. The injection tube of the machine is used to communicate with the injection port. The relationship between h and r is h(r), which satisfies the following equation: h(r) = 1 / (r) 2); and / or, the maximum scale division on the scale component is Rm, the total length of the injection tube is L, the included angle of the walls of the pressure measuring groove is β, and the diameter of the injection port of the injection tube is d0, which satisfy the relationship: Rm≥360(d0 / 2). 2 L / β.

[0009] In some embodiments, the projection shape of the pressure measuring groove on a plane perpendicular to its groove depth direction is fan-shaped; and / or, the projection of the bottom of the pressure measuring groove on a plane parallel to its groove depth direction is arc-shaped, the arc being a convex arc that bulges upwards along the groove bottom away from the pressure measuring groove.

[0010] In some embodiments, the metering element is further provided with a receiving groove for accommodating the end of an external injection tube, and the injection port is located at the bottom of the receiving groove.

[0011] In some embodiments, the pressure measuring mechanism further includes a fixed base, the fixed base having a receiving groove for adapting and accommodating the measuring element and the scale element.

[0012] In some embodiments, the receiving groove includes a first groove and a second groove communicating with the first groove. The first groove is used to accommodate the measuring element. The measuring element also has a clearance groove. The clearance groove is connected to the end of the pressure measuring groove away from the flow channel. The clearance groove is connected to the second groove. The scale element has a mounting portion protruding on the side facing the measuring element. The scale element is disposed in the pressure measuring groove, and the mounting portion is disposed in the clearance groove and the second groove.

[0013] In some embodiments, the measuring element has a retaining portion protruding from its periphery, and the fixing seat also has a retaining groove communicating with the receiving groove, and the retaining portion is adapted to be disposed in the retaining groove.

[0014] In some embodiments, the pressure measuring mechanism further includes a base connected to the side of the fixed seat opposite to the measuring element, and the base is used to connect to an external machine tool.

[0015] In some embodiments, the scale element is constructed as a transparent body.

[0016] In use, the pressure measuring mechanism is placed below the injection tube of the machine, aligning the injection tube with the injection port of the metering component. The machine moves closer to the pressure measuring mechanism to connect the injection tube with the injection port of the metering component, simultaneously setting the injection pressure and injecting fluid into the metering component. The fluid flows out through the injection tube and sequentially through the injection port and guide channel into the pressure measuring tank. After the injection tube has injected the preset volume of fluid, the machine moves away from the pressure measuring mechanism to disconnect the injection tube from the injection port, thus removing the pressure measuring mechanism. After removing the pressure measuring mechanism, the reading on the scale corresponding to the fluid front is read, and the injection pressure loss ratio of the machine is determined based on the reading. The injection pressure loss ratio of the machine is compared with the set injection pressure of the machine to determine whether the injection pressure loss ratio meets the injection requirements. When the reading on the scale corresponding to the fluid front is read, the scale and the measuring element can be separated to remove the fluid from the pressure measuring tank, the flow channel and the injection port. Then the scale and the measuring element can be connected again to facilitate the use of the pressure measuring mechanism to detect the fluid pressure.

[0017] The pressure measuring mechanism provided in this application, through the coordinated operation of the measuring element and the scale element, determines the injection pressure of the machine by reading the scale reading corresponding to the fluid front. The test results are intuitive and easy to judge, which helps to improve testing efficiency and save testing time. The pressure measuring mechanism has a simple structure and strong applicability, which helps to reduce the testing cost of fluid pressure. In addition, the pressure measuring mechanism can accurately detect the injection pressure of the machine without the need for external high-precision instruments, which helps to reduce the use and manufacturing costs of related equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the pressure measuring mechanism and injection tube provided in the embodiments of this application.

[0019] Figure 2 yes Figure 1 The diagram shows an exploded view of the pressure measuring mechanism and the injection tube.

[0020] Figure 3 yes Figure 1 The pressure measuring mechanism and injection tube shown are sectional views along line III-III.

[0021] Figure 4 yes Figure 1 A planar schematic diagram of the measuring element in the pressure measuring mechanism shown.

[0022] Explanation of main component symbols: pressure measuring mechanism 100, measuring element 10, injection port 11, pressure measuring groove 12, groove bottom 122, flow guiding channel 13, first channel 132, second channel 134, receiving groove 14, clearance groove 15, holding part 16, scale element 20, scale 21, mounting part 22, fixing base 30, receiving groove 31, first groove 311, second groove 312, holding groove 32, fastener 40, base 50, connector 60, injection tube 200, fluid front 1. Detailed Implementation

[0023] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0024] In the description of this application, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, it should be noted that "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows communication between the two components; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] The following will describe some embodiments of this application in detail with reference to the accompanying drawings.

[0027] Please see Figure 1This application provides a pressure measuring mechanism 100. The pressure measuring mechanism 100 is used to detect fluid pressure. Specifically, the pressure measuring mechanism 100 is used to detect the injection pressure loss of a machine (not shown). By detecting the injection pressure loss of the machine through the pressure measuring mechanism 100, it is determined whether the injection pressure loss ratio of the machine meets the injection requirements. If it does, the machine can operate normally; if not, the machine can be repaired.

[0028] Understandably, a fluid in a viscous state will flow when pressure is applied. However, due to the combined effects of the fluid's viscosity, flow channel friction, and solidification with temperature changes, the pressure corresponding to the actual flow distance of the fluid is not proportional to the magnitude of the applied pressure. This situation is called pressure loss.

[0029] Please refer to the above. Figure 2 and Figure 3 The pressure measuring mechanism 100 includes a measuring element 10 and a scale element 20.

[0030] The measuring component 10 has an injection port 11, a pressure measuring groove 12 spaced apart from the injection port 11, and a flow guiding channel 13 connecting the injection port 11 and the pressure measuring groove 12. The flow guiding channel 13 is approximately L-shaped. When the injection tube 200 of the machine injects fluid into the pressure measuring mechanism 100, the fluid flows into the flow guiding channel 13 through the injection port 11 and then into the pressure measuring groove 12. The depth of the pressure measuring groove 12 gradually increases from the end furthest from the flow guiding channel 13 to the end closest to the flow guiding channel 13. Specifically, the projection of the bottom 122 of the pressure measuring groove 12 onto a plane parallel to its depth direction is arc-shaped. The arc is a convex arc that bulges upward along the bottom 122 of the pressure measuring groove 12 away from the bottom. This convex arc can be an approximate parabola, forming a parabola from the shallower end of the pressure measuring groove 12 to the deeper end from top to bottom. The intersection point of the perpendicular lines of the two chords of the convex arc is located below the convex arc, resulting in a structure with varying depths in the pressure measuring groove 12, which helps reduce pressure loss of the fluid within the groove. The scale element 20 is connected to the measuring element 10 and covers the opening of the pressure measuring groove 12. A scale 21 is provided on the scale element 20, which can be laser-engraved. When the fluid flows within the pressure measuring groove 12, the pressure of the fluid can be calculated by observing the reading on the scale 21 on the scale element 20 corresponding to the fluid front 1.

[0031] In this embodiment, the pressure measuring mechanism 100 is placed below the injection tube 200 of the machine tool, aligning the injection tube 200 with the injection port 11 of the pressure measuring mechanism 100. The machine tool moves downwards towards the pressure measuring mechanism 100 to connect the injection tube 200 with the injection port 11 of the metering element 10, while simultaneously setting the injection pressure and injecting fluid into the metering element 10. The fluid flows out through the injection tube 200 and sequentially through the injection port 11 and the guide channel 13 into the pressure measuring tank 12. After the injection tube 200 has injected the preset volume of fluid, the machine tool moves upwards away from the pressure measuring mechanism 100 to disconnect the injection tube 200 from the injection port 11 of the metering element 10, thus removing the pressure measuring mechanism 100. After removing the pressure measuring mechanism 100, the reading on the scale 21 of the scale element 20 corresponding to the fluid front 1 is read. Based on the reading and the calculation formula, the injection pressure loss ratio of the machine tool can be obtained. By comparing the injection pressure loss ratio of the machine with the injection pressure set by the machine, it is determined whether the injection pressure loss ratio of the machine meets the injection requirements. Specifically, after reading the scale 21 on the scale 20 corresponding to the fluid front 1, the scale 20 can be separated from the metering component 10 to remove the fluid from the pressure measuring tank 12, the flow guide channel 13, and the injection port 11. Then, the scale 20 is reconnected to the metering component 10 so that the pressure measuring mechanism 100 can be used again to detect the fluid pressure.

[0032] Please see Figure 4 In this embodiment, the projection shape of the pressure measuring groove 12 on a plane perpendicular to its depth direction is fan-shaped. Understandably, during the actual filling process, the fluid flow wavefront advances in a fountain-like manner, meaning the fluid in the middle region is carried to the front of the wavefront and then thrown out to both sides. Thus, by defining the pressure measuring groove 12 as approximately fan-shaped, the actual filling process of the fluid can be realistically simulated when it flows within the pressure measuring groove 12, reducing abnormal pressure losses caused by unreasonable structural design of the pressure measuring groove 12, while ensuring smooth fluid flow.

[0033] In this embodiment, the flow guiding channel 13 includes a first channel 132 and a second channel 133. One end of the first channel 132 is connected to the injection port 11, and one end of the second channel 134 is connected to the other end of the first channel 132. The second channel 134 is perpendicular to the first channel 132, and the connection between the second channel 134 and the first channel 132 is constructed as an arc. The other end of the second channel 134 is connected to one end of the pressure measuring groove 12. For example, the other end of the second channel 134 is connected to the deeper end of the pressure measuring groove 12, wherein the bottom of the second channel 134 is higher than the bottom 122 of the deepest part of the pressure measuring groove 12. Thus, by setting the flow channel 13 to include the first channel 132 and the second channel 133, the injection port 11 is connected to the pressure measuring tank 12; by limiting the connection between the second channel 134 and the first channel 132 to be arc-shaped, the fluid can flow smoothly in the flow channel 13; by limiting the bottom of the second channel 134 to be higher than the bottom 122 of the deepest part of the pressure measuring tank 12, the fluid can fully flow into the pressure measuring tank 12.

[0034] In this embodiment, the ratio between the volume of the pressure measuring tank 12 and the length from the fluid front 1 within the pressure measuring tank 12 to the zero point of the scale 21 is βπ / 360, where β is the included angle of the tank walls of the pressure measuring tank 12. Thus, by defining the above ratio, the reading of the fluid front 1 can be easily read using the scale 21.

[0035] The formula for calculating the injection pressure loss ratio in this embodiment is roughly described below. It should be understood that this is not a limitation of the embodiments of this application.

[0036] First, let the diameter of the injection port of the injection tube 200 of the machine be d0, which can also be understood as the diameter of the injection port 11 being d0. Let the total length of the injection tube 200 be L, and the maximum volume of fluid stored in the injection tube 200 be V0. Then, we have the formula (1): V0=π(d0 / 2). 2 L.

[0037] Second, the included angle of the walls of the pressure measuring tank 12 is β, the length from the fluid front 1 to the zero point of the scale 21 is variable R, the length from the fluid front 1 to the center of the injection port 11 is r, the corresponding depth of the pressure measuring tank 12 is variable h, the relationship between h and r is h(r), the diameter of the injection tube 200 is d, the fluid volume below the injection tube 200 is V1, that is, the volume of the guide channel 13 is V1, the volume of the guide channel 13 is a fixed value and can be measured by 3D technology, the fluid volume outside the injection tube 200 is V2, that is, the volume of the pressure measuring tank 12 is V2, then it has formula (2): V2= βπr 2 / 360h(r)dr.

[0038] For ease of reading and calculation, V2 needs to be linearly related to r, therefore βπr 2 / 360h(r) needs to be set as a constant, so h(r) = 1 / (r) 2 Then, we have formula (3): V2 = βπ / 360dr=βπ / 360(r-(d / 2))=βπR / 360.

[0039] Third, set the initial pressure of injection tube 200 as P0, the pressure loss of fluid front 1 as PS, the fluid volume loss as VS, and Pb as the pressure loss ratio, then we have the formula (4): VS=V0-V1-V2, Pb=PS / P0=VS / V0=(V0-V1-V2) / V0. It can be understood that pressure and volume are directly proportional.

[0040] Fourth, set the maximum scale of the scale 21 on the scale component 20 to Rm, and the corresponding fluid volume in the pressure measuring tank 12 to Vm. In order to ensure that the injection volume of the injection tube 200 of the machine does not overflow the maximum scale of the scale 21 on the scale component 20, Vm≥V0, that is, it has the formula (5): βπRm / 360≥π(d0 / 2). 2 L, therefore Rm≥360(d0 / 2) 2 L / β.

[0041] Thus, the injection pressure loss ratio of the machine can be calculated based on the above calculation formula and the reading of the scale 21 on the scale component 20.

[0042] To ensure compatibility between the injection tube 200 and the metering component 10, in this embodiment, the metering component 10 is also provided with a receiving groove 14. The receiving groove 14 is used to accommodate the end of the injection tube 200, and the injection port 11 is located at the bottom of the receiving groove 14. Thus, by providing the receiving groove 14 on the metering component 10, compatibility between the injection tube 200 and the metering component 10 is ensured.

[0043] To allow for direct observation of the fluid front 1 within the pressure measuring tank 12, in this embodiment, the scale element 20 is constructed as a transparent material, such as glass. Thus, by making the scale element 20 transparent, it is ensured that the fluid front 1 within the pressure measuring tank 12 can be directly observed. It is understood that in other embodiments, only the portion of the scale element 20 corresponding to the ruler 21 may be made of transparent material.

[0044] In this embodiment, the pressure measuring mechanism 100 also includes a fixing base 30. The fixing base 30 has a receiving groove 31, which is used to accommodate the measuring component 10 and the scale component 20. Thus, by providing the fixing base 30, the structural strength of the pressure measuring mechanism 100 is improved, and the stability of the pressure measuring mechanism 100 is ensured.

[0045] In this embodiment, the receiving groove 31 includes a first groove 311 and a second groove 312 communicating with the first groove 311. The first groove 311 is used to accommodate the measuring element 10. The measuring element 10 is also provided with a clearance groove 15, which is connected to the end of the pressure measuring groove 12 away from the flow guiding channel 13. The clearance groove 15 is also connected to the second groove 312. The scale element 20 has a mounting part 22 protruding on the side facing the measuring element 10. The scale element 20 is disposed in the pressure measuring groove 12, and the mounting part 22 is disposed in the clearance groove 15 and the second groove 312. Thus, by providing the mounting part 22 on the scale component 20, it is ensured that after the scale component 20 is connected to the measuring component 10, it can seal the end of the pressure measuring groove 12 away from the guide channel 13, thus preventing fluid leakage from the pressure measuring groove 12. At the same time, by limiting the mounting part 22 to be set in the clearance groove 15 and the second groove 312, the connection strength between the measuring component 10, the scale component 20 and the fixed seat 30 is improved, thus ensuring the stability of the pressure measuring mechanism 100.

[0046] In this embodiment, the pressure measuring mechanism 100 further includes a fastener 40. The fastener 40 can be a screw, which passes through the mounting portion 22 of the scale member 20 and connects to the fixing seat 30. Thus, by setting the fastener 40, a stable connection is achieved between the scale member 20, the measuring member 10, and the fixing seat 30, ensuring the structural stability of the pressure measuring mechanism 100.

[0047] In this embodiment, the measuring component 10 has a retaining portion 16 protruding from its periphery, and the fixing base 30 also has a retaining groove 32 communicating with the receiving groove 31. The retaining portion 16 is adapted to be disposed within the retaining groove 32. There are two retaining portions 16 and two retaining grooves 32. Thus, by providing the aforementioned retaining portion 16, it is convenient to remove and place the measuring component 10 from the fixing base 30.

[0048] In this embodiment, the pressure measuring mechanism 100 further includes a base 50, which is connected to the side of the fixed base 30 away from the measuring element 10. The base 50 is used to connect to an external machine. Thus, by providing the aforementioned base 50, the pressure measuring mechanism 100 can be connected to an external machine, improving the applicability of the pressure measuring mechanism 100.

[0049] In this embodiment, the pressure measuring mechanism 100 further includes connecting members 60. The number of connecting members 60 is equal to the number of retaining parts 16, and the connecting members 60 can be screws. Each connecting member 60 passes through the corresponding retaining part 16 on the measuring member 10 and the corresponding retaining groove 32 on the fixing seat 30 and is connected to the base 50. In this way, by setting the connecting members 60, a stable connection is achieved between the measuring member 10, the fixing seat 30 and the base 50, ensuring the structural stability of the pressure measuring mechanism 100.

[0050] In this embodiment, the materials of the metering component 10, the fixing base 30 and the base 50 can all be selected from materials that are not easily deformed when heated to below 500°C, such as stainless steel.

[0051] The pressure measuring mechanism 100 provided in this embodiment, through the coordinated operation of the measuring element 10 and the scale element 20, can determine the injection pressure of the machine by reading the scale 21 on the scale element 20 corresponding to the fluid front 1. The detection result is intuitive and easy to judge, which helps to improve detection efficiency and save detection time. The pressure measuring mechanism 100 has a simple structure and strong applicability, and is suitable for the detection requirements of various machines, which helps to reduce the detection cost of fluid pressure. In addition, the pressure measuring mechanism 100 can accurately detect the injection pressure of the machine without the need for external high-precision instruments, which helps to reduce the use and manufacturing costs of related equipment. The fixed seat 30 and the base 50 improve the structural stability of the pressure measuring mechanism 100 and enhance its applicability.

[0052] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be embraced within this application.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. A pressure measuring mechanism for detecting fluid pressure, characterized in that, include: The measuring element has an injection port, a pressure measuring groove spaced apart from the injection port, and a flow guiding channel connecting the injection port and the pressure measuring groove. The depth of the pressure measuring groove gradually increases from the end away from the flow guiding channel to the end close to the flow guiding channel. and A scale element is connected to the measuring element and covers the opening of the pressure measuring groove, and a scale is provided on the scale element.

2. The pressure measuring mechanism as described in claim 1, characterized in that, The flow channel includes a first channel and a second channel. One end of the first channel is connected to the injection port, and one end of the second channel is connected to the other end of the first channel. The second channel is perpendicular to the first channel. The connection between the second channel and the first channel is constructed as an arc. The other end of the second channel is connected to one end of the pressure measuring groove.

3. The pressure measuring mechanism as described in claim 1, characterized in that, The depth of the pressure measuring tank is a variable h. When the maximum volume of fluid is stored in the injection tube of the machine, the length r from the fluid front of the pressure measuring tank to the center of the injection port is the corresponding length. The injection tube of the machine is used to communicate with the injection port. The relationship between h and r is h(r), which satisfies the following equation: h(r) = 1 / (r) 2 ); and / or, The maximum scale division on the graduated component is Rm, the total length of the injection tube is L, the included angle between the walls of the pressure measuring groove is β, and the diameter of the injection port of the injection tube is d0. These conditions satisfy the following relationship: Rm≥360(d0 / 2). 2 L / β.

4. The pressure measuring mechanism as described in claim 1, characterized in that, The projection shape of the pressure measuring groove on a plane perpendicular to its depth direction is fan-shaped; and / or, The projection of the bottom of the pressure measuring groove onto a plane parallel to its depth direction is arc-shaped, and the arc is a convex arc that bulges upward away from the bottom of the pressure measuring groove.

5. The pressure measuring mechanism as described in claim 1, characterized in that, The metering component is also provided with a receiving groove, which is used to accommodate the end of an external injection tube, and the injection port is located at the bottom of the receiving groove.

6. The pressure measuring mechanism as described in claim 1, characterized in that, The pressure measuring mechanism also includes a fixed base, which has a receiving groove for accommodating the measuring element and the scale element.

7. The pressure measuring mechanism as described in claim 6, characterized in that, The receiving groove includes a first groove and a second groove communicating with the first groove. The first groove is used to accommodate the measuring element. The measuring element also has a clearance groove. The clearance groove is connected to the end of the pressure measuring groove away from the flow channel. The clearance groove is connected to the second groove. The scale element has a mounting part protruding on the side facing the measuring element. The scale element is disposed in the pressure measuring groove. The mounting part is disposed in the clearance groove and the second groove.

8. The pressure measuring mechanism as described in claim 6, characterized in that, The measuring component has a retaining part protruding from its periphery, and the fixing seat also has a retaining groove communicating with the receiving groove, and the retaining part is adapted to be disposed in the retaining groove.

9. The pressure measuring mechanism as described in claim 6, characterized in that, The pressure measuring mechanism also includes a base, which is connected to the side of the fixed seat away from the measuring element, and the base is used to connect to an external machine tool.

10. The pressure measuring mechanism as described in any one of claims 1 to 9, characterized in that, The scale element is constructed to be transparent.

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