Split type freezing clamp for freezing assembly of valve sleeve

Abstract

The utility model provides a split type freezing clamp for freezing assembly of a valve sleeve, which comprises a first freezing clamp (1), a second freezing clamp (2) and a lining (3), and the first freezing clamp (1) and the second freezing clamp (2) are both semi-cylindrical pipes with taper chamfers on two sides. Six slotted holes for mounting bushings and six threaded holes with bolt screw sleeves, which are uniformly distributed on the two sides, are formed in the opposite surfaces; a lining (3) is arranged in the slotted hole, and the slotted hole is opposite to the threaded hole in position and used for allowing a hexagonal fillister head screw to penetrate through so as to fix the first freezing clamp (1) and the second freezing clamp (2) in an involution manner; the thermal expansion coefficient of the first freezing clamp (1) and the thermal expansion coefficient of the second freezing clamp (2) are larger than the thermal expansion coefficient of the main control valve sleeve. The machining precision of the tool can be improved, the machining cost of the tool is reduced, and the sealing ring can be prevented from being extruded and deformed in the valve sleeve installing process.

Description

TECHNICAL FIELD

[0001] The utility model belongs to actuator assembly technology relates to a kind of split type refrigeration fixture for valve sleeve refrigeration assembly. BACKGROUND

[0002] Actuator is mainly composed of control mechanism (i.e. control module assembly) and executing mechanism (i.e. actuator cylinder assembly), wherein control module assembly is mainly realized actuator cylinder assembly piston movement by controlling main control valve valve core displacement, so the assembly process of main control valve assembly has decisive influence on actuator control precision.Main control valve sleeve is fixed in the middle of control module shell using locking nut at both ends, and it needs to be first inserted into the main control valve hole of control module shell in the assembly process.Valve sleeve surface is installed with more than ten sealing rings, and the outer diameter of the sealing ring is not only greater than the outer diameter of valve sleeve itself, but also greater than the diameter of main control valve inner hole, so installing valve sleeve at normal temperature will inevitably cause sealing ring damage, so refrigeration fixture is needed to clamp valve sleeve with sealing ring at normal temperature, and place in temperature box for a certain time to keep low temperature, so that sealing ring reaches material brittleness temperature interval, and the characteristics of sealing ring contraction rate being higher than valve sleeve at low temperature and sealing ring not rebounding at brittleness temperature interval make the outer diameter of sealing ring contract to close to the outer diameter of valve sleeve and not expand immediately after opening refrigeration fixture, so valve sleeve can be smoothly installed into the main control valve hole of control module.

[0003] The refrigeration fixture used in the assembly of main control valve uses stainless steel material, and the inner hole machining size of tooling is very sensitive, so the diameter of inner hole of fixture and main control valve inner hole needs to be strictly controlled to be basically consistent during tooling machining, and if the size deviation is large (deviation of main control valve inner hole diameter is more than 0.05mm), the tooling will not be used.At the same time, after valve sleeve is installed into fixture, the two ends of fixture need to be closed, and the sharp edges on both sides of fixture inner hole are easy to cut and damage sealing ring and cause part damage.Due to the fact that refrigeration fixture uses stainless steel material similar to valve sleeve, and the thermal expansion coefficients are basically the same, the contraction degree of refrigeration fixture and valve sleeve is consistent during temperature reduction, so the purpose of further tightening valve sleeve cannot be achieved through tooling, so after refrigeration ends, the assembly process of valve sleeve in main control valve inner hole may appear assembly jamming problem and cause assembly failure, which reduces production efficiency, increases assembly time and material cost, so it is necessary to improve the design of refrigeration fixture. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of split type refrigeration fixture for valve sleeve refrigeration assembly, solves the inner hole machining size of existing tooling is very sensitive, after refrigeration ends, the assembly process of valve sleeve in main control valve inner hole can appear assembly jamming problem and cause assembly failure, which reduces the problem of production efficiency.

[0005] The utility model provides a split type refrigeration clamp for valve sleeve refrigeration assembly, which comprises: a first refrigeration clamp 1, a second refrigeration clamp 2 and a bushing 3, wherein:

[0006] The first refrigeration clamp 1 and the second refrigeration clamp 2 are both semicylindrical tubes with tapered chamfers on both sides;

[0007] The opposite surface of the first refrigeration clamp 1 to the second refrigeration clamp 2 is provided with six groove holes for installing bushings on both sides;

[0008] The opposite surface of the second refrigeration clamp 2 to the first refrigeration clamp 1 is provided with six threaded holes with pin sleeves on both sides;

[0009] The six groove holes for installing bushings and the six threaded holes with pin sleeves are opposite in position, and are used for penetrating hexagonal cylindrical head screws to fixedly connect the first refrigeration clamp 1 and the second refrigeration clamp 2;

[0010] The thermal expansion coefficient of the first refrigeration clamp 1 and the second refrigeration clamp 2 is greater than the thermal expansion coefficient of the main control valve sleeve.

[0011] Optionally, the diameter of the groove hole on the first refrigeration clamp 1 is greater than the diameter of the threaded hole on the second refrigeration clamp 2.

[0012] Optionally, the opposite surface of the first refrigeration clamp 1 and the second refrigeration clamp 2 is provided with two semicircular opening grooves arranged on both sides;

[0013] The semicircular opening grooves on the first refrigeration clamp 1 and the second refrigeration clamp 2 are opposite in position.

[0014] Optionally, the opposite surface of the second refrigeration clamp 2 to the first refrigeration clamp 1 is provided with two rectangular grooves arranged on both sides.

[0015] Optionally, the thermal expansion coefficient of the first refrigeration clamp 1 and the second refrigeration clamp 2 is greater than 10 times the thermal expansion coefficient of the main control valve sleeve.

[0016] Optionally, the inner diameter of the first refrigeration clamp 1 and the second refrigeration clamp 2 is greater than the outer diameter of the main control valve sleeve by 0.1-0.2 mm.

[0017] The split type refrigeration clamp for valve sleeve refrigeration assembly can relax the machining precision of tooling, reduce the machining cost of tooling, avoid the extrusion deformation of the sealing ring during the valve sleeve assembly process, improve the assembly quality and efficiency of the actuator main control valve sleeve, and save manpower and material resources. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the refrigeration clamp assembly schematic provided by the utility modelFigure 1 ;

[0019] Figure 2 is Figure 1 a CC surface section view of the first refrigeration clamp;

[0020] Figure 3 is a refrigeration clamp assembly schematic provided by the utility model Figure 2 ;

[0021] Figure 4 is a refrigeration clamp working principle diagram;

[0022] Figure 5 is a first refrigeration clamp structure schematic Figure 1 ;

[0023] Figure 6 is a first refrigeration clamp structure schematic Figure 2 ;

[0024] Figure 7 is a second refrigeration clamp structure schematic Figure 1 ;

[0025] Figure 8 is a second refrigeration clamp structure schematic Figure 2 ;

[0026] Figure 9 is a screw bush structure schematic view;

[0027] Mark explanation:

[0028] 1-first refrigeration clamp;

[0029] 2-second refrigeration clamp;

[0030] 3-bush;

[0031] 4-internal hexagonal cylindrical head screw;

[0032] 5-valve sleeve;

[0033] 6-sealing ring. Specific embodiments

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0035] The features and illustrative embodiments of each aspect of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without some or all of these specific details. The description of the embodiments is merely intended to provide a better understanding of the present application by showing examples of the present application. The present application is in no way limited to any specific set of details disclosed below, but covers any modifications, equivalents, and alternatives falling within the spirit of the present application. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessary obscurity of the present application.

[0036] It should be noted that the features of the embodiments of the present application and the embodiments can be combined with each other without conflict, and each embodiment can be mutually referenced and quoted. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] The present application will be described in detail below in combination with the accompanying drawings and specific embodiments.

[0038] Referring to Figures 1 to 9 The present application provides a split type freezing clamp for valve sleeve freezing assembly, comprising: a first freezing clamp 1 and a second freezing clamp 2.

[0039] The first freezing clamp 1 and the second freezing clamp 2 are both processed from polytetrafluoroethylene material, and are half-cylinder structures with inner holes, wherein chamfers with tapers are processed at both ends of the inner holes, the middle part of the inner holes is a straight hole, the inner diameter is 0.1-0.2mm larger than the outer diameter of the valve sleeve, and half-circular opening grooves are arranged on both sides of the edges, which are used to open the freezing clamp after freezing and heat preservation by using a special opening tool, and a rectangular opening groove is further arranged on the second freezing clamp 2, so that the two sides of the freezing clamp can be opened by using a straight screw cutter. A pin screw is used on the second freezing clamp 2 to realize the function of the threaded hole, so as to avoid the damage of the thread caused by the softness of the polytetrafluoroethylene material. A bushing 3 is installed in the groove hole of the first freezing clamp 1, and the first freezing clamp 1 and the second freezing clamp 2 are connected together by using an internal hexagonal cylindrical head screw 4 after being closed.

[0040] The use method of the present application is:

[0041] Before low-temperature freezing:

[0042] The split type polytetrafluoroethylene freezing clamp is opened according to Figure 1 and Figure 3As shown, assemble to form a complete set of fixtures, after the valve sleeve 5 part surface installation multiple sealing ring 6, apply the appropriate amount of grease, the valve sleeve 5 along the inner hole of the outer corner of the refrigeration fixture push into the refrigeration fixture, because the refrigeration fixture inner hole diameter compared with the valve sleeve outer diameter to be large, the valve sleeve 5 can be smoothly pushed into the fixture, and in the process of sealing ring 6 play the role of shaping. After installing the valve sleeve 5, as shown, the refrigeration fixture as a whole into the incubator for freezing. Figure 4 As shown, the refrigeration fixture as a whole into the incubator for freezing.

[0043] After low temperature freezing:

[0044] Use a straight screw cutter in the rectangular opening slot or use a special opening tool in the circular opening slot to open the refrigeration fixture, and then install the valve sleeve 5 together with the sealing ring 6 on it into the inner hole of the control module master valve.

[0045] The innovation of the utility model:

[0046] 1. The refrigeration fixture uses polytetrafluoroethylene material instead of the previous stainless steel material. Because the thermal expansion coefficient of polytetrafluoroethylene is several tens of times higher than that of stainless steel, the shrinkage rate of the polytetrafluoroethylene refrigeration fixture is much larger than that of the valve sleeve in a low temperature state, so the shrinkage shaping effect is better, and the valve sleeve assembly is easier. At the same time, because polytetrafluoroethylene has a larger shrinkage rate, the inner hole machining size range of the refrigeration fixture is larger, and the machining difficulty is significantly reduced. In addition, the material cost of polytetrafluoroethylene is lower under the same volume, and the material is light and easy to grasp, so the convenience of valve sleeve refrigeration assembly can be provided in terms of cost, machining and assembly;

[0047] 2. The inner hole of the refrigeration fixture is chamfered on both sides, and the inner hole diameter is much larger than the outer diameter of the valve sleeve. The valve sleeve can be easily installed from one side of the refrigeration fixture without opening the refrigeration fixture. The traditional stainless steel refrigeration fixture needs to be opened to install the valve sleeve, and the sealing ring is easily squeezed in the closing process. The utility model can make the installation process of the valve sleeve in the refrigeration fixture more convenient, and avoid the possibility of the sealing ring being squeezed in the closing process of the traditional refrigeration fixture. The fixture can be installed as a whole after use, and the turnover protection is more convenient than the two-piece stainless steel refrigeration fixture;

[0048] 3. The refrigeration fixture 1 is provided with an aluminum T-shaped bushing, which protects the inner hole and the surface of the hole groove during the connection of the two refrigeration fixtures, and prevents the inner hexagonal cylindrical head from being squeezed to deform the installation surface and the inner hole of the soft polytetrafluoroethylene refrigeration fixture during the threaded connection process;

[0049] 4. The frozen clamp 2 threaded hole uses a pin sleeve, compared with a steel wire sleeve, the pin sleeve is not easy to loosen, and the fastening effect is stronger, so it is suitable to be used on the surface of polytetrafluoroethylene material, plays the role of a threaded hole, avoids the damage of the polytetrafluoroethylene frozen clamp thread during long-term use, and helps to prolong the service life of the frozen clamp.

[0050] One embodiment of the utility model

[0051] The utility model discloses a patent has been successfully applied to the frozen assembly operation of the main control valve sleeve of a certain type of actuator, and compared with the original scheme, the frozen clamp is lower in production and processing cost, has better frozen shrinkage effect, is more convenient to assemble and use, improves sleeve assembly quality and efficiency, and reduces use cost.

[0052] The above-mentioned embodiments only express the preferred embodiments of the utility model, and the description is more specific and detailed, but it should not be understood as the limitation of the scope of the utility model patent. It should be pointed out that: the above-mentioned embodiments are only used to illustrate the technical scheme of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the utility model, and these modifications or replacements should be covered in the protection scope of the utility model.

Claims

1. A split cryogenic fixture for cryogenic assembly of a valve cage, characterized by, The utility model relates to a refrigeration clamp for main control valve, which comprises a first refrigeration clamp (1), a second refrigeration clamp (2) and a bushing (3), wherein: The first refrigeration clamp (1) and the second refrigeration clamp (2) are both half-cylindrical tubes with tapered chamfers on both sides; The opposite surface of the first refrigeration clamp (1) to the second refrigeration clamp (2) is provided with six groove holes for installing bushings on both sides; Each groove hole is provided with a bushing (3), and the bushing (3) is provided with an outward flange at one end; The opposite surface of the second refrigeration clamp (2) to the first refrigeration clamp (1) is provided with six threaded holes with pin sleeves on both sides; The six groove holes for installing bushings and the six threaded holes with pin sleeves are opposite to each other, and a hexagonal cylindrical head screw is arranged to be passed through to fixedly connect the first refrigeration clamp (1) and the second refrigeration clamp (2); The thermal expansion coefficient of the first refrigeration clamp (1) and the second refrigeration clamp (2) is greater than the thermal expansion coefficient of the main control valve sleeve.

2. The split freeze jig for freeze fitting of valve cups according to claim 1, wherein, The diameter of the groove hole on the first refrigeration clamp (1) is greater than the diameter of the threaded hole on the second refrigeration clamp (2).

3. The split freeze jig for freeze fitting of valve cups according to claim 1, wherein, The opposite surface of the first refrigeration clamp (1) and the second refrigeration clamp (2) is provided with two half-circular opening grooves arranged on both sides; The half-circular opening grooves on the first refrigeration clamp (1) and the second refrigeration clamp (2) are opposite to each other.

4. The split freeze jig for freeze fitting of valve cups according to claim 1, wherein, The opposite surface of the second refrigeration clamp (2) to the first refrigeration clamp (1) is provided with two rectangular grooves arranged on both sides.

5. The split freeze jig for freeze fitting of valve cups as set forth in claim 1, wherein, The thermal expansion coefficient of the first refrigeration clamp (1) and the second refrigeration clamp (2) is greater than 10 times the thermal expansion coefficient of the main control valve sleeve.

6. The split freeze jig for freeze fitting of valve cups according to claim 1, wherein, The inner diameter of the first refrigeration clamp (1) and the second refrigeration clamp (2) is 0.1-0.2mm larger than the outer diameter of the main control valve sleeve.

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