Piston pressure gauge

Abstract

The application discloses a piston pressure gauge, which comprises a measuring assembly, a rotating assembly and a driving assembly. The measuring assembly comprises a hanging basket, a piston assembly, a measuring base and a measuring base pedestal which are coaxially arranged, the piston assembly is installed in the measuring base, the measuring base is installed above the measuring base pedestal, the hanging basket is sleeved outside the piston assembly, a horizontal hanging basket tray is arranged at the bottom of the hanging basket and corresponds to the position of the measuring base pedestal, and a plurality of clamping grooves are uniformly arranged on the lower surface of the hanging basket tray. The rotating assembly comprises a rotating seat which is arranged below the measuring assembly, the measuring base pedestal is located at the central axis position of the rotating seat, and a plurality of protruding knobs are symmetrically arranged on the upper surface of the rotating seat. The driving assembly is arranged below the rotating assembly. The knobs on the rotating seat are used for driving the clamping grooves on the hanging basket tray, the rotation of the rotating seat drives the rotation of the hanging basket and the hanging basket tray, and the hanging basket drives the rotation of the mass weight and the piston assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of measuring equipment, in particular to a piston pressure gauge. BACKGROUND

[0002] The piston pressure gauge is a standard measuring device for pressure measurement based on the principle of hydrostatic balance, i.e. the fluid pressure acting on the effective area of the piston is balanced with the gravity of the load. It can transmit signals to precision pressure gauges, pressure transmitters, differential pressure transmitters, pressure sensors, pressure signal generators and digital pressure gauges, etc. It has the characteristics of wide range, high precision, stable technical performance and easy use, etc.

[0003] The piston pressure gauge is based on the principle of balance in fluid mechanics and Pascal's law for pressure measurement. One force is generated in the hydraulic container, and the other force is generated by the weight of the special weight added to the piston acting on the piston area. The two forces are balanced. This balance is a dynamic balance. Dynamic balance has two meanings. First, the descent of the piston system is a real-time dynamic, and the balance of the piston system is a dynamic change process. Second, the pressure of the piston pressure gauge is also a dynamic balance value, which fluctuates within a very small range.

[0004] The rotating system of the piston pressure gauge is to eliminate static friction and improve the sensitivity of the piston pressure gauge. The piston rod of the piston pressure gauge needs the largest force between moving and not moving. If the piston pressure gauge does not rotate, only when the force is greater than a certain degree, the piston system will be suspended. After suspension, the pressure will exceed the pressure generated by the weight. If the piston has a rotating system, only a small force is needed to make the piston system suspended, which improves the sensitivity of the piston pressure gauge.

[0005] Figure 1 is a schematic sectional view of the front direction of the piston pressure gauge in the prior art; Figure 2 is Figure 1 is an enlarged schematic view of part A of the piston pressure gauge in the prior art shown in Figure 1 and Figure 2As shown, the rotating system of the existing piston pressure gauge generally adopts the way of rotating cylinder 31, the piston assembly includes piston rod 28, piston 2 and piston cylinder 29, the piston assembly is installed in the rotating cylinder 31, and the transmission mode is that the motor 13 drives the motor wheel 37 to rotate, the motor wheel 37 drives the transmission belt 38 to rotate, the transmission belt 38 drives the motor belt wheel 14 to rotate, and the motor belt wheel 14, the rotating cylinder 31 and the support sleeve 30 are sequentially connected by screws; and there is no connecting piece at the joint between the support sleeve 30 and the piston assembly. In order to drive the piston assembly, the hanging basket 1 and the mass weight 3 to rotate at the same time, the friction force of the contact surface C is relied on. Only when the friction force is sufficient, the rotation can be driven smoothly. If the friction force is insufficient, the rotation cannot be driven, and at the same time, the piston assembly, the hanging basket 1 and the mass weight 3 will be shaken violently. When the shaking is too large, the piston rod 28 will be broken and cannot be used. SUMMARY

[0006] The present application aims to overcome the above problems or at least partially solve or alleviate the above problems.

[0007] According to one aspect of the present application, a piston pressure gauge is provided, comprising:

[0008] A measuring assembly, comprising a hanging basket and coaxially arranged piston assembly, measuring base and measuring base pedestal, the piston assembly is installed in the measuring base, the measuring base is installed above the measuring base pedestal, the hanging basket is sleeved outside the piston assembly, a horizontally arranged hanging basket tray is arranged at the position corresponding to the bottom of the measuring base pedestal, for stacking and loading mass weights, and a plurality of clamping grooves are uniformly arranged on the lower surface of the hanging basket tray;

[0009] A rotating assembly, comprising a rotating seat arranged below the measuring assembly, the measuring base pedestal is located at the central axis position of the rotating seat, and a plurality of protruding knobs are arranged on the upper surface of the rotating seat; and

[0010] A driving assembly arranged below the rotating assembly, for driving the rotating seat to rotate.

[0011] Optionally, the bottom of the knob is provided with a vertical spring.

[0012] Optionally, a fixed base is further included, which is fixedly connected with the measuring base and located at the bottom end of the measuring base, a motor fixing plate is fixedly connected to the bottom of the fixed base, and the driving assembly comprises a motor, a motor driving wheel and a transmission wheel, the motor is fixedly installed on the motor fixing plate, the output shaft of the motor is fixedly connected with the center of the motor driving wheel, the motor driving wheel and the transmission wheel are driven by a transmission belt, the transmission wheel is installed on the fixed base, and the rotating seat is fixedly installed above the transmission wheel.

[0013] Optionally, a concentric groove is processed on the upper surface of the transmission wheel, and a concentric boss is processed at the corresponding position of the lower surface of the rotating seat, and the concentric groove and the concentric boss are tightly matched.

[0014] Optionally, a thrust bearing is installed at the position of the lower surface of the transmission wheel, and a first deep groove ball bearing is installed at the position of the upper surface of the transmission wheel.

[0015] Optionally, the piston assembly comprises a piston, a piston cylinder and a piston rod, the measuring base comprises an upper measuring base and a lower measuring base, the piston cylinder is installed between the upper measuring base and the lower measuring base, one end of the piston rod is connected with the piston, and the other end of the piston rod is inserted into the piston cylinder and extends out of the lower measuring base.

[0016] Optionally, a second deep groove ball bearing is installed between the piston and the upper measuring base, and a gap of 0.3-0.5 mm is left between the inner diameter of the second deep groove ball bearing and the outer diameter of the piston.

[0017] A third deep groove ball bearing is installed between the measuring base and the hanging basket, and a gap of 0.5-1.0 mm is left between the outer diameter of the third deep groove ball bearing and the inner diameter of the hanging basket.

[0018] Optionally, a limiting screw for limiting the up-down displacement distance of the piston is installed on the side wall of the upper measuring base.

[0019] Optionally, a base oil cup is installed between the measuring base and the hanging basket tray, and the upper end of the base oil cup is fixed by an oil cup pressing ring.

[0020] Optionally, the shifting block has a first part and a second part, the first part is provided with a downward blind hole for installing the spring, the second part is provided with a through hole at the end thereof for fixing the shifting block in the rotating seat by a fixing pin, and the height of one end of the second part adjacent to the first part is higher than the height of the other end thereof.

[0021] The piston pressure gauge of the present application uses a shift block on a rotating seat to shift the slot on the hanging basket tray above it, and the rotation of the rotating seat drives the rotation of the hanging basket and the hanging basket tray, and the hanging basket drives the mass weight and piston assembly to rotate to meet the requirements.

[0022] Furthermore, the piston pressure gauge of the present application can ensure the coaxiality and flatness requirements of the transmission wheel and the rotating seat during the assembly process through the close fit of the concentric grooves and the concentric bosses, while ensuring the smooth rotation of the shift block.

[0023] Based on the detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings below, those skilled in the art will become more aware of the above and other objects, advantages and features of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Hereinafter, some specific embodiments of the present application will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the drawings:

[0025] Figure 1 It is a schematic cross-sectional view of a piston pressure gauge in the prior art in the main viewing direction;

[0026] Figure 2 yes Figure 1 An enlarged schematic diagram of part A of a piston pressure gauge in the prior art is shown;

[0027] Figure 3 is a schematic cross-sectional view in the main viewing direction of a piston pressure gauge according to one embodiment of the present application;

[0028] Figure 4 yes Figure 3 An enlarged schematic diagram of part B of the piston pressure gauge shown in the main viewing direction;

[0029] Figure 5 yes Figure 3 A side view of the piston pressure gauge;

[0030] Figure 6 yes Figure 3 A bottom view of the piston gauge;

[0031] Figure 7 yes Figure 3 Bottom view of the basket tray of the piston gauge shown.

[0032] Reference numerals:

[0033] Hanging basket-1; piston-2; mass weight-3; upper measuring base-4; lower measuring base-5; fixed base-6; hanging basket tray-7; rotating seat-8; dial block-9; spring-10; clamping groove-11; measuring base pedestal-12; motor-13; motor driven wheel-14; transmission wheel-15; motor fixing plate-16; concentric groove-17; concentric boss-18; first deep groove ball bearing-19; second deep groove ball bearing-20; third deep groove ball bearing-21; limit screw-22; base oil cup-23; oil cup pressing ring-24; blind hole-25; through hole-26; fixing pin-27; piston rod-28; piston cylinder-29; support sleeve-30; rotating cylinder-31; bearing pressing ring-32; thrust bearing-33; transmission belt-34; first part-35; second part-36; motor wheel-37; transmission belt-38. DETAILED DESCRIPTION

[0034] Figure 3 is a schematic view of the front direction of the piston pressure gauge according to an embodiment of the present application. Referring to Figure 3 , the piston pressure gauge can generally include a measuring assembly, a rotating assembly, a driving assembly and a fixed base 6.

[0035] Referring to Figure 3 , the measuring assembly includes a hanging basket 1 and coaxially arranged piston assembly, measuring base and measuring base pedestal 12. The piston assembly includes a piston 2, a piston cylinder 29 and a piston rod 28, the piston cylinder 29 is installed between the upper measuring base 4 and the lower measuring base 5, one end of the piston rod 28 is connected to the piston 2, and the other end is inserted into the piston cylinder 29 and extends out of the lower measuring base 5. The measuring base specifically includes an upper measuring base 4 and a lower measuring base 5 connected to each other and arranged in an upper and lower direction, respectively, the piston assembly is installed in the upper measuring base 4, and the lower measuring base 5 is installed above the measuring base pedestal 12.

[0036] Referring to Figure 3 , the hanging basket 1 is sleeved on the outside of the piston assembly, and the hanging basket 1 is provided with a horizontally arranged hanging basket tray 7 at the position corresponding to the measuring base pedestal 12 at the bottom, for stacking and loading mass weights 3. Figure 7 is a bottom view of the hanging basket tray 7 of the piston pressure gauge shown in Figure 3 . Referring to Figure 7 , the lower surface of the hanging basket tray 7 is provided with a plurality of clamping grooves 11 arranged uniformly. The number of clamping grooves 11 is generally even, which can be preferably 4-12, and in the preferred embodiment of the present application, the number of clamping grooves 11 is set to 8, and the 8 clamping grooves 11 are arranged uniformly. The clamping groove 11 is realized by machining a key groove hole.

[0037] The rotating assembly comprises a rotating seat 8 arranged below the measuring assembly, and the measuring base 12 is arranged at the central axis of the rotating seat 8, and the rotating seat 8 is sleeved outside the measuring base 12.

[0038] Referring to Figure 3 , the rotating seat 8 is provided with a plurality of protruding blocks 9 symmetrically arranged on the upper surface thereof. The number of the protruding blocks 9 is preferably 2-4, and in the preferred embodiment of the present application, the number of the protruding blocks 9 is 2, and the two protruding blocks 9 are symmetrically arranged. The design of the two symmetric protruding blocks 9 ensures the symmetry of the force acting on the hanging basket tray 7, and prevents eccentricity caused by uneven force. The rotation of the protruding blocks 9 drives the hanging basket tray 7 through the contact of the protruding blocks 9 with the clamping grooves 11, so that no friction is needed, and no shaking problem occurs. The rotation of the hanging basket tray 7 and the hanging basket 1 is driven by the rotation of the two symmetrically arranged protruding blocks 9, and the hanging basket 1 drives the mass weight 3 and the piston 2 to rotate to meet the requirements.

[0039] Figure 4 is Figure 3 an enlarged schematic view of the front direction of the B part of the piston pressure gauge shown in Figure 4 . Referring to , the bottom of the protruding block 9 is provided with a vertical spring 10, so that the protruding block 9 can move up and down freely. The design of the spring 10 is to ensure that if the clamping groove 11 on the hanging basket tray 7 does not cooperate with the protruding block 9, as the protruding block 9 rotates, when the protruding block 9 rotates to the position of the clamping groove 11, the spring 10 will make the protruding block 9 pop into the clamping groove 11, so as to achieve the purpose of driving the rotation of the hanging basket tray 7 by the rotation of the protruding block 9. Another function of the spring 10 is that after the protruding block 9 drives the hanging basket tray 7, the mass weight 3 and the piston 2 to rotate, as the internal pressure of the calibration table of the piston pressure gauge rises, the hanging basket tray 7 will rise and be separated from the protruding block 9, and the hanging basket tray 7, the mass weight 3 and the piston 2 will continue to rotate, and when the pressure reaches the working position, the pressure calibration can be carried out. Since electromagnetic interference cannot occur during the calibration process, the motor 13 is adjusted to be in an off state during the pressure calibration process, and the piston 2 itself has a certain descending speed. As the piston 2 descends, the hanging basket tray 7 contacts the protruding block 9 again, but the protruding block 9 is in a static state at this time, and the hanging basket tray 7 is in a rotating state. Since the spring 10 can make the protruding block 9 move up and down freely, the hanging basket tray 7 can easily and freely pass the position of the protruding block 9.

[0040] Figure 5 is Figure 3 a side view of the protruding block 9 of the piston pressure gauge shown in Figure 6 is Figure 3 a bottom view of the protruding block 9 of the piston pressure gauge shown in Figure 5 and Figure 6, the dial block 9 has a first part 35 and a second part 36, the first part 35 is provided with a downward blind hole 25 for mounting the spring 10, the end of the second part 36 is provided with a through hole 26 for fixing the dial block 9 in the rotating seat 8 through a fixing pin 27, and the height of one end of the second part 36 adjacent to the first part 35 is higher than the height of the other end. Figure 6 It can be seen that the edge of the dial block 9 is designed in an arc shape, which ensures that it can conform to the rotating direction of the hanging basket tray 7 when dialing the card slot 11.

[0041] Referring to Figure 3 , the fixed base 6 is fixedly connected with the measuring base 12 and located at the bottom end of the measuring base 12, the measuring base 12 is located at the central position of the fixed base 6, and the motor fixing plate 16 is fixedly connected to the outer periphery of the bottom of the fixed base 6 for mounting the motor 13.

[0042] Referring to Figure 3 , the driving assembly is arranged below the rotating assembly for driving the rotating seat 8 to rotate. The driving assembly comprises a motor 13, a motor driving wheel 14 and a transmission wheel 15, the motor 13 is fixedly installed on the motor fixing plate 16, and the motor 13 is fixed below the motor fixing plate 16, the output shaft of the motor 13 penetrates from below the motor fixing plate 16 to above the motor fixing plate 16, the motor driving wheel 14 is located directly above the output shaft of the motor 13, the output shaft of the motor 13 is fixedly connected with the center of the motor driving wheel 14, the motor driving wheel 14 and the transmission wheel 15 are driven by a transmission belt 34, the transmission wheel 15 is installed on the fixed base 6, the rotating seat 8 is fixedly installed above the transmission wheel 15, and the transmission wheel 15, the rotating seat 8 and the measuring base 12 are coaxially arranged.

[0043] When the motor 13 works, the output shaft drives the motor driving wheel 14 to rotate, and then the motor driving wheel 14 drives the transmission wheel 15 to rotate through the transmission belt 34, and since the transmission wheel 15 is fixed with the rotating seat 8 above it, the rotating seat 8 can rotate.

[0044] Referring to Figure 3 , a concentric groove 17 is formed on the upper surface of the transmission wheel 15, and a concentric boss 18 is formed at the corresponding position of the lower surface of the rotating seat 8, the concentric groove 17 and the concentric boss 18 are tightly matched to ensure the coaxiality and flatness of the transmission wheel 15 and the rotating seat 8 during assembly, and also ensure the stable rotation of the two symmetrical dial blocks 9.

[0045] Referring to Figure 3The transmission wheel 15 is installed with a thrust bearing 33 at the lower surface position, and a first deep groove ball bearing 19 at the upper surface position. The purpose of the thrust bearing 33 is to ensure the runout of the plane of the rotating seat 8, and the purpose of the first deep groove ball bearing 19 is to ensure the coaxiality requirement of the rotating seat 8.

[0046] Referring to Figure 3 The second deep groove ball bearing 20 is installed between the piston 2 and the upper measuring base 4, and a gap of 0.3-0.5mm is left between the inner diameter of the second deep groove ball bearing 20 and the outer diameter of the piston 2. The third deep groove ball bearing 21 is installed between the measuring base pedestal 12 and the hanging basket 1, and a gap of 0.5-1.0mm is left between the outer diameter of the third deep groove ball bearing 21 and the inner diameter of the hanging basket 1. The main function of the second deep groove ball bearing 20 and the third deep groove ball bearing 21 is to prevent the piston rod 28 from being broken due to accidental collision of the hanging basket 1 when the mass weight 3 is added or reduced. The third deep groove ball bearing 21 is fixed by a bearing pressing ring 32.

[0047] Referring to Figure 3 The side wall of the upper measuring base 4 is installed with a limiting screw 22 for limiting the up and down displacement distance of the piston 2. The limiting screw 22 can ensure that the piston rod 28 moves within a safe range, and ensure the normal work of the piston assembly.

[0048] Referring to Figure 3 The measuring base pedestal 12 is installed with a base oil cup 23 between the hanging basket tray 7, and the upper end is fixed by an oil cup pressing ring 24. The base oil cup 23 can collect the lubricating oil flowing out when the piston rod 28 rotates, and reduce pollution.

[0049] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be understood as the usual meaning understood by the skilled person in the field to which the present application belongs.

[0050] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0051] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0052] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0053] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0054] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any changes or replacements that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A piston pressure gauge, characterized in that: include: The measuring assembly includes: a hanging basket and a coaxially arranged piston assembly, a measuring base, and a measuring base base. The piston assembly is installed in the measuring base, and the measuring base is installed above the measuring base base. The hanging basket is sleeved on the outside of the piston assembly. A horizontally arranged hanging basket tray is provided at the bottom of the hanging basket corresponding to the position of the measuring base base for stacking loading mass weights. The lower surface of the hanging basket tray is provided with multiple evenly arranged slots. A rotating assembly, comprising a rotating seat provided below the measuring assembly, wherein the measuring base is located at the central axis of the rotating seat, and the rotating seat is provided with a plurality of symmetrically arranged shift blocks protruding from its upper surface; and A driving assembly, disposed below the rotating assembly, for driving the rotating seat to rotate; The piston assembly includes: a piston, a piston cylinder and a piston rod. The measuring base includes an upper measuring base and a lower measuring base. The piston cylinder is installed between the upper measuring base and the lower measuring base. One end of the piston rod is connected to the piston, and the other end is inserted into the piston cylinder and extends to the lower measuring base. A vertical spring is installed at the bottom of the shift block; The shift block has a first part and a second part. The first part is provided with a downward blind hole for installing the spring. The end of the second part is provided with a through hole for fixing the shift block in the rotating seat through a fixing pin. The height of one end of the second part adjacent to the first part is higher than the height of the other end.

2. The piston pressure gauge according to claim 1, characterized in that It also includes a fixed base, which is fixedly connected to the measuring base base and is located at the bottom end of the measuring base base. The bottom of the fixed base is fixedly connected to a motor fixing plate. The driving assembly includes: a motor, a motor drive wheel and a transmission wheel. The motor is fixedly installed on the motor fixing plate. The output shaft of the motor is fixedly connected to the center of the motor drive wheel. The motor drive wheel and the transmission wheel are driven by a transmission belt. The transmission wheel is installed on the fixed base, and the rotating base is fixedly installed above the transmission wheel. The transmission wheel, the rotating base and the measuring base base are all coaxially arranged.

3. The piston pressure gauge according to claim 2, characterized in that A concentric groove is processed on the upper surface of the transmission wheel, and a concentric boss is processed at a corresponding position on the lower surface of the rotating seat. The concentric groove and the concentric boss are tightly matched.

4. The piston pressure gauge according to claim 2, wherein: A thrust bearing is installed at the lower surface of the transmission wheel, and a first deep groove ball bearing is installed at the upper surface of the transmission wheel.

5. The piston pressure gauge according to claim 1, wherein A second deep groove ball bearing is installed between the piston and the upper measuring base, and a gap of 0.3-0.5 mm is left between the inner diameter of the second deep groove ball bearing and the outer diameter of the piston; A third deep groove ball bearing is installed between the measuring base and the hanging basket, and a gap of 0.5-1.0 mm is left between the outer diameter of the third deep groove ball bearing and the inner diameter of the hanging basket.

6. The piston pressure gauge according to claim 1, wherein The side wall of the upper measuring base is installed with a limit screw for limiting the up and down displacement distance of the piston.

7. The piston pressure gauge according to claim 1, wherein A base oil cup is installed between the measuring base and the hanging basket tray, and the upper end of the base oil cup is fixed by an oil cup pressure ring.

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