Device and method for laying lead sheath in cylindrical structure

Abstract

The invention discloses a device and method for laying a lead sheath in a barrel type structure, and belongs to the technical field of lead sheath laying equipment.The device for laying the lead sheath in the barrel type structure is used for producing a barrel type X-ray speed governor and comprises an elastic sleeve assembled in the barrel type structure and a swing assembly arranged in the elastic sleeve, the swing assembly comprises a rotating shaft, a rotating sliding block and an elastic piece, one end of the elastic piece is connected with the rotating shaft, the other end of the elastic piece is connected with the rotating sliding block, and the rotating sliding block pushes and presses the lead sheath to be flattened along the inner wall of the cylindrical structure through circumferential movement. The invention discloses a method for laying a lead sheath in a cylindrical structure. A device for laying the lead sheath in the cylindrical structure is adopted. The problems that the lead sheath laying efficiency is low, and the lead sheath is broken and wrinkled in the production process of the barrel type X-ray speed governor are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of lead sheet laying equipment, and in particular relates to a device and method for laying lead sheet in a cylindrical structure. Background Art

[0002] The X-ray beam limiter is an important component of the X-ray generating device, which is used to limit the radiation range of X-rays in space. Specifically, it absorbs the rays emitted by the X-ray tube in a 360° circumferential direction and only retains the rays within the conical output angle range, and the rays are within the optimal detection area.

[0003] X-ray beam limiters are divided into gate-type X-ray beam limiters and cylinder-type X-ray beam limiters. The structure of the cylinder-type X-ray beam limiter is as follows: Figure 1 and Figure 2 As shown, it includes a cylindrical structure 31 and a layer of lead sheet 32 ​​pasted on the inner wall of the cylindrical structure. The lead sheet is exposed to the radiation range of the ray, and a certain roughness should be maintained and defects such as scratches and wrinkles should be strictly controlled.

[0004] Among them, lead sheet pasting belongs to the "soft-to-hard" type of pasting, and is a mechanical composite molding between dissimilar materials. During the pasting process, the lead sheet needs to be laid on the inner wall of the cylindrical structure.

[0005] In the prior art, lead sheet laying is done manually or with the assistance of tools. Manual operation is done by manual rolling, which is inefficient, complicated to position and lacks precision. Tool-assisted operation refers to using airbags for airbag extrusion, using underwater explosive tooling for explosive expansion, or using rollers for roller extrusion. Among them, airbag extrusion is suitable for structures with small openings and easy load-bearing, such as spherical shells and cylindrical shells, while explosive expansion is mostly used for corrosion-resistant / high-load-bearing bimetallic composite oil and gas pipelines. Both are not suitable for cylindrical X-ray beam limiters. Roller extrusion is suitable for materials with high ductility (soft and deformable) and high elongation (not easy to damage after deformation), such as aluminum alloys. When used for materials such as lead sheets that are ductile but have low elongation, defects such as fractures and wrinkles caused by uneven local pressure are prone to occur. Summary of the invention

[0006] The invention provides a device and method for laying lead sheets in a cylindrical structure, which are used to solve the problems of low lead sheet laying efficiency and lead sheet forming defects inside a cylindrical X-ray speed limiter.

[0007] In order to solve the above technical problems, the technical solution of the present invention is: a device for laying lead sheets in a cylindrical structure, which is used to produce a cylindrical X-ray speed limiter, including an elastic sleeve assembled inside the cylindrical structure and a swinging assembly built into the elastic sleeve, the swinging assembly including a rotating shaft, a rotating slider, and an elastic member connected to the rotating shaft at one end and the rotating slider at the other end, the rotating slider pushes the lead sheets to be flattened along the inner wall of the cylindrical structure through circumferential motion.

[0008] Specifically, the rotary slider has a plane connected to the elastic member and an arc-shaped surface arranged relative to the plane.

[0009] Specifically, the rotating shaft is coaxial with the cylindrical structure.

[0010] Specifically, the rotating shaft is connected with a supporting structure.

[0011] Specifically, the elastic member is a leaf spring.

[0012] Specifically, the elastic sleeve is made of rubber material.

[0013] The present invention also discloses a method for laying lead sheets in a cylindrical structure, which uses a device for laying lead sheets in a cylindrical structure and specifically comprises the following steps:

[0014] S1: Pre-lay the lead sheet in the cylindrical structure, generate overlapping seams between the ends of the lead sheet, and generate an overhead layer between the lead sheet and the cylindrical structure;

[0015] S2: contracting the elastic member, embedding the elastic sleeve, the rotating slider and the rotating shaft inside the lead sheet, wherein the rotating shaft is coaxial with the cylindrical structure;

[0016] S3: Pop open the elastic member, and rotate the slider to squeeze the elastic sleeve, the lead sheet and the cylindrical structure in the radial direction;

[0017] S4: Rotate the rotating shaft, and the rotating slider slides in the circumferential direction under the drive of the rotating shaft to eliminate the overhead layer and the overlap;

[0018] S5: Contract the elastic part and take out the elastic sleeve, rotating slider and rotating shaft from the inside of the lead sheet.

[0019] The technical solution provided by the present invention has the following advantages compared with the prior art:

[0020] 1. Build a buffer layer between the lead sheet and the rotating slider to achieve flexible contact between the two and prevent the surface of the lead sheet from being scratched; at the same time, the rotating slider moves in a circular direction to evenly press the lead sheet to solve the problem of lead sheet breakage and wrinkles caused by low elongation of the lead sheet itself or too fast compaction, and control the forming defects of the lead sheet;

[0021] 2. Taking into account the structural characteristics of the cylindrical X-ray beam limiter with openings on both sides and a relatively large length-to-diameter ratio, lead sheets are pre-laid, and then the overlap seams and overhead layers are eliminated, solving the problems of the traditional manual roller positioning being complicated and lacking in precision, and improving the efficiency of lead sheet laying. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is an axial cross-sectional view of a cylindrical X-ray beam limiter in the background technology of the present invention;

[0023] Figure 2 is a radial cross-sectional view of a cylindrical X-ray beam limiter according to an embodiment of the present invention

[0024] Figure 3 It is an overall structural diagram of a device for laying lead sheets in a cylindrical structure according to an embodiment of the present invention;

[0025] Figure 4 This is a diagram of the use state of the device for laying lead sheets in a cylindrical structure according to an embodiment of the present invention;

[0026] Figure 5 This is a process diagram of lead sheet pre-laying in an embodiment of the present invention;

[0027] Figure 6 This is a state diagram of lead sheets pre-laid in a cylindrical structure in an embodiment of the present invention.

[0028] As shown in the figure: 10, elastic sleeve; 20, swing assembly; 21, rotating shaft; 22, rotating slider; 23, elastic member; 30, cylindrical X-ray speed limiter; 31, cylindrical structure; 32, lead sheet; 40, lap joint; 50, overhead layer. DETAILED DESCRIPTION

[0029] For ease of understanding, the device and method for laying lead sheets in a cylindrical structure are described below in conjunction with embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation and positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] like Figure 3 and Figure 4As shown, the device for laying lead sheets in a cylindrical structure in this embodiment includes an elastic sleeve 10 and a swinging assembly 20 built into the elastic sleeve 10, the swinging assembly 20 includes a rotating shaft 21, a rotating slider 22, and an elastic member 23 connected to the rotating shaft 21 at one end and connected to the rotating slider 22 at the other end, and the rotating slider 22 pushes the lead sheets 32 to be flattened along the inner wall of the cylindrical structure 31 by circumferential motion. The device for laying lead sheets in a cylindrical structure in this embodiment is used to produce a cylindrical X-ray beam limiter 30, which includes a cylindrical cylindrical structure 31 and a layer of lead sheets 32 pasted on the inner wall of the cylindrical structure 31. Specifically, the device for laying lead sheets in a cylindrical structure is used to press and compact the lead sheets 32 pre-laid on the inner wall of the cylindrical structure 31 to eliminate the lap joints 40 at both ends of the lead sheets 32 and the overhead layer 50 between the lead sheets 32 and the cylindrical structure 31.

[0033] The elastic sleeve 10 is molded from EPDM rubber to cushion the impact of the rotating slider 22 on the lead sheet 32 ​​and avoid scratches on the surface of the lead sheet 32. The wall thickness of the elastic sleeve 10 is 0.5 mm to 1.0 mm.

[0034] The rotating shaft 21 is made of stainless steel, and the surface smoothness of stainless steel is better than that of a mirror. The diameter of the rotating shaft 21 is 10.0 mm. Before using the device, the rotating shaft 21 is assembled into the cylindrical structure 31 and is coaxial with the cylindrical structure 31. The rotating shaft 21 is connected to a supporting structure (not shown in the figure) for maintaining the rotating shaft 21 always in a coaxial state with the cylindrical structure 31.

[0035] The rotating slider 22 is made of stainless steel, and the surface smoothness of stainless steel is better than that of a mirror surface, so the surface smoothness of the rotating slider 22 is high. The rotating slider 22 has a plane connected to the elastic member 23 and an arc surface arranged relative to the plane. In the cross section of the rotating slider 22, the arc surface is an arc line, and the plane is a straight line. The chord length of the arc line is parallel to the straight line, and the length of the chord length of the arc line is less than the length of the straight line.

[0036] The elastic member 23 is a leaf spring.

[0037] like Figure 5 and Figure 6 As shown, the method for laying lead sheets in a cylindrical structure in this embodiment uses a device for laying lead sheets in a cylindrical structure, and specifically includes the following steps:

[0038] S1: Coating a rubber layer on the inner wall of the cylindrical structure 31, pre-laying the lead sheet 32 ​​in the cylindrical structure 31, forming a lap joint 40 between the ends of the lead sheet 32, and forming an overhead layer 50 between the lead sheet 32 ​​and the cylindrical structure 31;

[0039] S2: contraction leaf spring, the elastic sleeve 10, the rotating slider 22 and the rotating shaft 21 are built into the lead sheet 32, wherein the rotating shaft 21 is coaxial with the cylindrical structure 31;

[0040] S3: The elastic member 23 is ejected, and the rotating slider 22 radially squeezes the elastic sleeve 10, the lead sheet 32 ​​and the cylindrical structure 31;

[0041] S4: The rotating shaft 21 is connected to a manual crank or other driving source, such as a motor, to rotate the rotating shaft 21. The rotating slider 22 slides in the circumferential direction under the drive of the rotating shaft 21 to eliminate the overhead layer 50 and the lap joint 40. The adhesive layer solidifies and the lead sheet 32 ​​is fixed on the inner wall of the cylindrical structure 31.

[0042] S5: Contract the leaf spring and take out the elastic sleeve 10, the rotating slider 22 and the rotating shaft 21 from the lead sheet 32.

[0043] At the auxiliary operation level, the present invention solves the problems of the cumbersome and insufficient precision of traditional manual roller positioning; specifically, a swing structure is provided in combination with the structural characteristics of the cylindrical X-ray beam limiter, which has openings on both sides and a relatively large length-to-diameter ratio; the swing structure flattens and compacts the lead sheet 32, eliminates the lap seams 40 and the overhead layer 50, reduces manual operations, and improves the efficiency of laying the lead sheet 32.

[0044] At the core operation level, the present invention solves the problems that the traditional hard roller is prone to scratching the lead sheet 32, and the lead sheet 32 ​​is prone to breakage and wrinkling due to too fast compaction; specifically, the shape, size, structure and running route of the roller are optimized, that is, a rotating slider 22 that moves in a circumferential direction is provided to apply uniform pressure to the lead sheet 32; at the same time, an elastic sleeve 10 is provided, and the elastic sleeve 10 forms a buffer layer between the lead sheet 32 ​​and the rotating slider 22 to achieve flexible contact, thereby preventing the rotating slider 22 from scratching the lead sheet 32 ​​and controlling the molding defects of the lead sheet 32.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for laying lead sheets in a cylindrical structure, which is used to produce a cylindrical X-ray speed limiter, characterized in that: It includes an elastic sleeve assembled inside a cylindrical structure and a swinging component built into the elastic sleeve. The swinging component includes a rotating shaft, a rotating slider, and an elastic member with one end connected to the rotating shaft and the other end connected to the rotating slider. The rotating slider pushes the lead sheet to be flattened along the inner wall of the cylindrical structure through circumferential motion.

2. The device for laying lead sheets in a cylindrical structure as claimed in claim 1, characterized in that: The rotary slider comprises a plane connected to the elastic member and an arc-shaped surface arranged opposite to the plane.

3. The device for laying lead sheets in a cylindrical structure as claimed in claim 1, characterized in that: The rotating shaft is coaxial with the cylindrical structure.

4. The device for laying lead sheets in a cylindrical structure as claimed in claim 1, characterized in that: The rotating shaft is connected with a supporting structure.

5. The device for laying lead sheets in a cylindrical structure as claimed in claim 1, characterized in that: The elastic member is a leaf spring.

6. The device for laying lead sheets in a cylindrical structure as claimed in claim 1, characterized in that: The elastic sleeve is made of rubber material.

7. A method for laying lead sheet in a cylindrical structure, characterized in that: The device for laying lead sheets in a cylindrical structure according to any one of claims 1 to 6 specifically comprises the following steps: S1: Pre-lay the lead sheet in the cylindrical structure, generate overlapping seams between the ends of the lead sheet, and generate an overhead layer between the lead sheet and the cylindrical structure; S2: contracting the elastic member, embedding the elastic sleeve, the rotating slider and the rotating shaft inside the lead sheet, wherein the rotating shaft is coaxial with the cylindrical structure; S3: Pop open the elastic member, and rotate the slider to squeeze the elastic sleeve, the lead sheet and the cylindrical structure in the radial direction; S4: Rotate the rotating shaft, and the rotating slider slides in the circumferential direction under the drive of the rotating shaft to eliminate the overhead layer and the overlap; S5: Contract the elastic part and take out the elastic sleeve, rotating slider and rotating shaft from the inside of the lead sheet.

Images