Gauge body assembly machining clamp

Abstract

The utility model discloses a machining clamp for a meter body assembly. The machining clamp is characterized by comprising a clamp base, a left positioning disc, a right supporting table, a center pin, an anti-rotating pin and a pressing cylinder. The clamp seat comprises a bottom flat plate and a left side vertical plate; the left positioning disc is fixedly connected to the right side face of the left side vertical plate. The center pin is vertically fixed on the left positioning disc; the anti-rotating pin is fixed to the left positioning disc, and the pressing cylinder is fixedly installed on the left side vertical plate. The right supporting table is fixed to the right side of the bottom flat plate, and a right positioning groove and a left positioning groove are formed in the top of the right supporting table. And a right positioning surface is formed between the right positioning groove and the left positioning groove of the right supporting table. The tool can be used for clamping and positioning the meter body assembly of the vortex shedding flowmeter during radial hole machining, and the machining precision, the production efficiency and the stability of the meter body assembly can be remarkably improved through left-right composite positioning of the left positioning disc and the right supporting table, the anti-rotation function of the anti-rotation pin and automatic pressing of the pressing cylinder.

Description

TECHNICAL FIELD

[0001] The utility model relates to a meter body assembly machining clamp. BACKGROUND

[0002] The vortex flowmeter is a kind of volume flowmeter that measures the volume flow, volume flow or mass flow of gas, steam or liquid according to the Karman vortex principle. The vortex flowmeter is a very advanced and ideal measuring instrument, and is widely used in the flow measurement of industrial pipeline medium fluid. The vortex flowmeter includes a meter body assembly, an anti-interference sensor, a display, a vortex generator, a disassembly assembly, a connecting assembly and a handle.

[0003] As a kind of meter body assembly, please refer to Figure 1 The meter body assembly N is composed of a pipe body N-1 and a probe seat N-4 combined and welded as a whole. The pipe body N-1 is provided with an inner hole N-11 in the center, and left and right flanges (N-2, N-3) are symmetrically arranged at both ends of the pipe body N-1. When the probe seat N-2 is welded with the pipe body N-1, the probe hole of the probe seat N-2 and the side hole of the pipe body N-1 are required to be concentric and equal in diameter. After welding, when it is detected that there is a deviation in the radial hole N-12 combined by the probe hole and the side hole, the main problem is that the perpendicularity between the radial hole N-12 and the inner hole N-11 of the pipe body N-1 cannot meet the precision requirement, and then the radial hole N-12 of the meter body assembly needs to be modified and processed (using machining methods such as drilling or boring), and a clamp for positioning and clamping the meter body assembly needs to be designed when the radial hole N-1 of the meter body assembly is modified and processed, and the perpendicularity precision requirement between the radial hole N-12 and the inner hole N-11 needs to be met.

[0004] In addition, after searching, no special clamp or tool for machining the radial hole of the meter body assembly of the vortex flowmeter described above is found.

[0005] However, the machining clamp for flange or pipe is currently only disclosed (for reference, CN213040073U, CN209407511U, etc.), but it has the following problems when used in the product. The traditional clamp mainly uses single plane positioning, which is easy to cause deviation of the coaxiality of the pipe body and the flange, and the pipe body is easy to rotate due to stress during machining, which affects the machining precision. At the same time, the manual clamping device is used, which has low clamping efficiency and poor stability. UTILITY MODEL CONTENTS

[0006] The utility model provides a kind of meter body assembly machining clamp to solve the technical problem of how to position and clamp when the radial hole of the meter body assembly of the vortex flowmeter described above is machined.

[0007] In order to achieve the above object, the utility model technical scheme is as follows: a watch body assembly machining clamp, characterized by comprising a clamp base, a left positioning disc, a right supporting table, a center pin, an anti-rotation pin and a pressing cylinder;

[0008] The clamp base comprises a bottom plate and a left vertical plate arranged perpendicularly to the bottom plate;

[0009] The left positioning disc is fixedly connected to the right side surface of the left vertical plate, and is used for being in surface contact with the left flange outer end surface of the watch body assembly to realize axial positioning;

[0010] The center pin is fixedly arranged on the left positioning disc and is used for being matched with the inner hole of the pipe watch body of the watch body assembly to realize concentric positioning;

[0011] The anti-rotation pin is fixedly arranged on the left positioning disc and is used for being inserted into the left flange connecting hole of the watch body assembly to limit the circumferential rotation of the watch body assembly;

[0012] The pressing cylinder is fixedly arranged on the left vertical plate and is used for pressing the left flange of the watch body assembly;

[0013] The right supporting table is fixedly arranged on the right side of the bottom plate, and the top of the right supporting table is provided with a right positioning groove and a left positioning groove; the right positioning groove is used for radially limiting the right flange of the watch body assembly, and the left positioning groove is used for radially supporting the pipe watch body of the watch body assembly; a right positioning surface is formed between the right positioning groove and the left positioning groove of the right supporting table; and the right positioning surface is used for being in surface contact with the right flange inner end surface of the watch body assembly to realize axial positioning.

[0014] Further, the pressing cylinder has two and is symmetrically arranged on the left and right sides of the left positioning disc.

[0015] Further, the pressing cylinder is a lever pressing cylinder or a corner pressing cylinder.

[0016] Further, the left positioning disc, the right supporting table and the clamp base are an integral structure.

[0017] Further, the center pin is provided with a blow-through hole penetrating along the axis of the center pin, and the blow-through hole is connected with an external gas source to remove machining debris in the inner hole of the watch body assembly.

[0018] Further, the center pin and the left positioning disc are an integral structure.

[0019] Further, a drilling jig plate is arranged on the upper end of the bottom plate.

[0020] The utility model has the advantages of:

[0021] First, the utility model discloses a table body subassembly for vortex flowmeter can be used when machining the radial hole clamping positioning, and through the left positioning disc and the right support platform left and right composite positioning, the anti-rotation pin prevents rotation and the automatic pressure of pressure cylinder, can significantly improve the machining precision, production efficiency and stability of table body subassembly, and simultaneously avoid the left and right vibration caused by unilateral positioning mode when machining;

[0022] Second, the utility model discloses the symmetrical pressure of double pressure cylinders and equal force, and after clamping, it is difficult to loosen, and when machining, it can reduce the vibration amplitude, and compared with manual clamping, the time can be shortened, and the labor intensity is reduced;

[0023] Third, the utility model discloses the fixture is very compact, and also layout is reasonable, and it is convenient for the positioning clamping of workpiece, and it is convenient for the workpiece to be unloaded after machining;

[0024] Fourth, the utility model discloses the blowhole of center pin, elastic washer etc. Design solves the chip cleaning and workpiece protection problem, adapts to the high-precision, high-efficiency processing demand. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the structure diagram when the table body subassembly of a kind of vortex flowmeter of present application is welded as an entity.

[0026] Figure 2 It is the perspective view when the machining fixture of a kind of table body subassembly of the utility model embodiment one is not clamped in.

[0027] Figure 3 It is the working state diagram when the machining fixture of a kind of table body subassembly of the utility model embodiment one is positioned and clamped.

[0028] Figure 4 It is the working state diagram when the machining fixture of a kind of table body subassembly of the utility model embodiment two is removed workpiece after processing. DETAILED DESCRIPTION

[0029] The utility model will be further described in connection with the drawings and embodiment:

[0030] Embodiment one: can see Figures 2-4 A machining fixture of table body subassembly, it includes fixture seat 1, left positioning disc 2, right support platform 3, center pin 4, anti-rotation pin 5 and pressure cylinder 6.

[0031] Can see Figures 2-4 The fixture seat 1: by 45# steel casting, including the bottom flat plate 1-1 of horizontal arrangement and the left vertical plate 1-2 of vertical welding on the left side of bottom flat plate 1-1 upper surface.

[0032] The left positioning disc 2 is used for face contact with the outer end surface (i.e. left end surface) of the left flange N-2 of the table body assembly N to realize axial positioning.

[0033] Specifically, the left positioning disc 2 is a circular steel disc body, which is fixed on the right side surface of the left vertical plate 1-2 by bolts (or welding or integral molding), and the end surface thereof is finely ground by 3-3, with a flatness of ≤0.01mm, for closely abutting the outer end surface (i.e. left end surface) of the left flange N-2.

[0034] The center pin 4 is vertically fixed on the left positioning disc 2, and is used for gap cooperation with the inner hole N-11 of the pipe table body N-1 of the table body assembly N to realize concentric positioning.

[0035] Specifically, the center pin 4 is made of GCr15 bearing steel, and is surface hardened with a hardness of HRC58-62, and has an outer diameter smaller than the inner hole N-11 of the pipe table body N-1 by 0.02-0.05mm (gap cooperation), and is vertically welded (or threadedly connected) at the center of the left positioning disc 2.

[0036] The anti-rotation pin 5 is fixed on the left positioning disc 2, and is inserted into the connecting hole N-21 of the left flange N-2 of the table body assembly N to limit the circumferential rotation of the table body assembly N.

[0037] Specifically, the anti-rotation pin 5 has a diameter matching the connecting hole N-21 of the left flange N-2 with a gap cooperation, and the gap is less than 0.01mm, and the anti-rotation pin 5 is fixed on the left positioning disc 2 in a position corresponding to one of the connecting holes N-21.

[0038] The pressing cylinder 6 is fixedly installed on the left vertical plate 1-2, and is used for pressing the left flange N-2 of the table body assembly N.

[0039] Preferably, the pressing cylinder 6 has two, and is symmetrically installed on the front and rear sides (or upper and lower sides) of the left positioning disc 2, and in this embodiment, a lever pressing cylinder is selected, and a polyurethane buffer pad can be arranged on the end surface of the pressing head, and the pressing force can be adjusted in a range of 0.5-1.5Mpa.

[0040] The right supporting table 3 is fixed on the right side of the bottom plate 1-1, and the top thereof is provided with a right positioning groove 3-1 and a left positioning groove 3-2, the groove wall shape of the right positioning groove 3-1 matches the outer contour of the right flange N-3 of the table body assembly N to limit the radial position, and the groove wall shape of the left positioning groove 3-2 matches the outer diameter of the pipe table body N-1 to support in the radial direction; a right positioning surface 3-3 is formed between the right positioning groove 3-1 and the left positioning groove 3-2 of the right supporting table 3; and the right positioning surface 3-3 is used for face contact with the inner end surface N-31 of the right flange N-3 of the table body assembly N to realize axial positioning.

[0041] Specifically, the right support table 3 is integrally cast by cast iron, fixed to the right side of the bottom plate 1-1 by bolts (or welding or integral molding), and the top is processed with:

[0042] Right positioning groove 3-1: V-shaped groove structure, matched with the outer circle of the right flange N-3, radial positioning error ≤0.03mm;

[0043] Left positioning groove 3-2: semicircular groove, with a radius 0.01mm larger than the outer diameter of the pipe body N-1, used for auxiliary support of the pipe body;

[0044] Right positioning surface 3-3: a vertical plane processed by grinding, in contact with the inner end surface of the right flange N-3, axial positioning accuracy ≤0.02mm.

[0045] For reference Figures 2-4 In addition, the center pin 4 is provided with a blow-through hole 4-1 penetrating along its axis, which is connected to an external air source to remove the machining chips in the inner hole of the pipe body assembly N. When machining, the chips in the inner hole N-11 of the pipe body N-1 can be automatically blown out, and manual cleaning of the chips in the inner part of the pipe body N-1 is not required before the workpiece is taken out, and the workpiece does not need to be waited for after machining is completed, so as to improve the production efficiency.

[0046] The specific steps of the clamp in the clamping and machining process of the pipe body assembly N can be as follows:

[0047] (1) Left and right positioning: the outer end surface (i.e. left end surface) of the left flange N-2 of the pipe body assembly N is in contact with the right side surface of the left positioning disc 2, the center pin 4 is inserted into the inner hole N-11 by manually pushing the pipe body N-1, and the anti-rotation pin 5 is inserted into the connecting hole N-21; while the pipe body N-1 is supported by the left positioning groove 3-2 of the right support table 3, the right flange N-3 is radially positioned in the right positioning groove 3-1, and the inner end surface of the right flange N-3 is in contact with the right positioning surface 3-3;

[0048] (2) Tightening operation:

[0049] Start the work of the two tightening cylinders 6, and the two pressing heads symmetrically on the left and right apply a 1.0MPa tightening force to press the left flange N-2 at the front and rear positions respectively;

[0050] (3) Start the machine first to machine the radial hole of the pipe body assembly N; while machining, 0.3MPa compressed air is introduced into the blow-through hole 4-1 of the center pin 4, which will automatically blow away the chips in the inner hole N-11 of the pipe body N-1;

[0051] (4) After machining is completed, start the work of the two tightening cylinders 6 again to loosen the left flange N-2, then manually pull out the workpiece to the right, and then take it off from the clamp.

[0052] The embodiment has the following effects:

[0053] Firstly, the embodiment can realize positioning and clamping of the table body assembly, and the positioning and clamping accuracy of the inner hole of the table body assembly is ±0.01 mm after positioning and clamping. After machining on the machine tool, the perpendicularity requirement (such as 0.05 mm) of the radial hole of the table body assembly after machining and the inner hole of the table body assembly can be ensured.

[0054] Secondly, the embodiment can balance the force by symmetrical pressing of the double pressing cylinders, and the clamping is not easy to loosen, and the vibration amplitude can be reduced during machining. Compared with manual clamping, the time can be shortened, and the labor intensity can be reduced.

[0055] Thirdly, the clamp is very compact, and the layout is reasonable. The workpiece can be easily positioned and clamped, and the workpiece can be easily unloaded after machining.

[0056] Fourthly, the embodiment solves the problems of chip cleaning and workpiece protection by blowing perforation, elastic gasket and other designs, which is suitable for high-precision and high-efficiency machining requirements.

[0057] Fifthly, the embodiment can be used for clamping and positioning of the table body assembly of the vortex shedding flowmeter during radial hole machining. By left and right composite positioning of the left positioning disc and the right supporting table, anti-rotation of the anti-rotation pin and automatic pressing of the pressing cylinder, the machining precision, production efficiency and stability of the table body assembly can be significantly improved. At the same time, the left and right vibration caused by single side positioning during machining can be avoided.

[0058] Embodiment two: the embodiment is basically the same as embodiment one, and the difference is that:

[0059] Please refer to Figures 2-4 On the basis of embodiment 1, the clamp seat 1, the left positioning disc 2 and the right supporting table 3 are integrally cast by nodular cast iron QT500-7, and are subjected to stress relief annealing treatment.

[0060] Please refer to Figures 2-4 The center pin 4, the left positioning disc 2, the right positioning groove 3-1, the left positioning groove 3-2 and the right positioning surface 3-3 are integrally formed by CNC machining, and the assembly error is eliminated. The inner wall of the right positioning groove 3-1 is provided with an elastic nylon gasket layer to avoid scratching the surface of the right flange N-3. Due to the integral machining, the coaxial positioning error of the workpiece after clamping is ≤0.005 mm.

[0061] Embodiment three: the embodiment is basically the same as embodiment one or two, and the difference is that:

[0062] Please refer to Figures 2-4For the narrow space working condition, the pressing cylinder 6 is replaced by a rotary pressing cylinder, and the pressure head thereof can rotate 90 degrees to avoid the clamping path. When the workpiece is positioned, the pressure head is driven to rotate 90 degrees to the vertical pressing position, and then the pressing force is applied.

[0063] Embodiment four: this embodiment is basically the same as embodiment one or two or three, and the difference is that:

[0064] Please refer to Figures 2-4 On the basis of embodiment 1, further, a drill jig plate 7 is fixedly arranged on the upper end of the bottom plate 1-1. Because the drill jig plate is added in the machining clamp of the table body assembly, the machining precision and efficiency are further improved through the accurate guidance of the drill jig plate.

[0065] The above describes the preferred embodiments of the present application in detail. It should be understood that those skilled in the art can make many modifications and changes without creative labor according to the concept of the present application. Therefore, any technical solution obtained by logical analysis, reasoning or limited experiment on the basis of the existing technology according to the concept of the present application shall be within the protection scope defined by the claims.

Claims

1. A panel assembly machine tooling fixture, characterized by: The clamp base, the left positioning disc, the right supporting table, the center pin, the anti-rotation pin and the pressing cylinder are included. The clamp base includes a bottom plate and a left vertical plate arranged perpendicularly to the bottom plate. The left positioning disc is fixedly connected to the right side of the left vertical plate, and is used for surface body assembly left flange outer end surface contact matching to realize axial positioning. The center pin is fixedly arranged perpendicularly to the left positioning disc, and is used for pipe surface body inner hole matching to realize concentric positioning. The anti-rotation pin is fixedly arranged on the left positioning disc, and is used for inserting into the left flange connecting hole of the surface body assembly to limit the circumferential rotation of the surface body assembly. The pressing cylinder is fixedly arranged on the left vertical plate, and is used for pressing the left flange of the surface body assembly. The right supporting table is fixedly arranged on the right side of the bottom plate, and the top of the right supporting table is provided with a right positioning groove and a left positioning groove; the right positioning groove is used for the radial limiting of the right flange of the surface body assembly; the left positioning groove is used for the radial supporting of the pipe surface body of the surface body assembly; the right positioning surface is formed between the right positioning groove and the left positioning groove of the right supporting table; and the right positioning surface is used for right flange inner end surface contact matching to realize axial positioning.

2. A table body assembly machining fixture as claimed in claim 1, characterized in that: The pressing cylinder has two, and is symmetrically distributed on both sides of the left positioning disc.

3. A table body assembly machining fixture as claimed in claim 1, wherein: The pressing cylinder is a lever pressing cylinder or a corner pressing cylinder.

4. A table body assembly machining fixture as claimed in claim 1, wherein: The left positioning disc, the right supporting table and the clamp base are an integral structure.

5. A table body assembly machining fixture as claimed in claim 1, wherein: The center pin is provided with a blow-through hole penetrating along the axis of the center pin, and the blow-through hole is connected to an external air source to remove the machining debris in the inner hole of the surface body assembly.

6. A table body assembly machining fixture as claimed in claim 1, wherein: The center pin and the left positioning disc are an integral structure.

7. A table body assembly machining fixture as claimed in claim 1, wherein: The bottom plate is provided with a drilling jig plate at the upper end.

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