Positioning fixture

Abstract

The utility model relates to a kind of positioning tool.The positioning tool is used to install mounting support to the predetermined position on rocket storage tank.The positioning tool at least includes main body and the mounting plate of at least one end of main body setting.The mounting plate is used to fixedly install mounting support.Main body is flat, and main body is at least provided with central opening portion in the center.Set at least one first direction positioning pointer and at least one second direction positioning pointer around central opening portion.The first direction positioning pointer is used to determine the position of main body in predetermined first direction, and the second direction positioning pointer is used to determine the position of main body in predetermined second direction.The positioning tool provided by the utility model can reduce the operation amount of field positioning in the process of fixing mounting support on the bottom of rocket storage tank, while ensuring that mounting support is positioned on the bottom of rocket storage tank with high precision.

Description

Technical Field

[0001] This utility model relates to a positioning tool, which is particularly suitable for positioning mounting brackets for installing accessories on the bottom of rocket storage tanks. Background Technology

[0002] The rocket propellant tank is the main structural component of a rocket, primarily used for storing propellants. Various functional accessories, such as gas cylinders, are typically mounted on the outer bottom of the propellant tank. These accessories are generally secured to the bottom of the rocket propellant tank using specific brackets.

[0003] The bottom of a rocket propellant tank is typically a smooth ellipsoid. In large rockets, the diameter of the propellant tank can often reach several meters, or even exceed 10 meters. When installing mounting brackets for accessories, workers often need to lie prone on the ellipsoidal surface, fixing and installing various brackets by marking lines, repeatedly measuring, and adjusting. This method of operation is very labor-intensive, inefficient, and carries the risk of failing to ensure the positioning accuracy of the brackets. Utility Model Content

[0004] The purpose of this utility model is to provide a positioning tool and its usage method, which can reduce the amount of on-site positioning work during the process of fixing the mounting bracket for accessories to the bottom of the rocket propellant tank, while ensuring that the mounting bracket is positioned with high precision on the bottom of the rocket propellant tank.

[0005] To achieve the above objectives, the present invention provides the following solution.

[0006] According to one aspect of the present invention, a positioning fixture is provided for installing a mounting bracket at a predetermined position on a rocket propellant tank. The positioning fixture includes at least a main body and a mounting plate disposed at at least one end of the main body, the mounting plate being used to fix the mounting bracket. The main body is flat and has a central opening at least in the center. At least one first-direction positioning pointer and at least one second-direction positioning pointer are disposed around the central opening. The first-direction positioning pointer is used to determine the position of the main body in a predetermined first direction, and the second-direction positioning pointer is used to determine the position of the main body in a predetermined second direction.

[0007] The positioning fixture includes a mounting plate for fixing the mounting bracket. The mounting plate can be pre-set with high precision within the main body of the positioning fixture according to design requirements. Thus, after the mounting bracket is fixed to the mounting plate, accurate positioning of the mounting bracket can be achieved as long as the positioning fixture is accurately positioned on the bottom of the rocket propellant tank.

[0008] During on-site positioning operations, the first and second direction positioning pointers can be used to quickly and accurately position the entire positioning fixture onto the rocket propellant tank. When the positioning fixture has multiple mounting plates, multiple mounting brackets can be positioned simultaneously through a single positioning operation of the fixture, significantly reducing the amount of on-site positioning work.

[0009] Preferably, in the main body, a first direction mounting hole for mounting the first direction positioning pointer and a second direction mounting hole for mounting the second direction positioning pointer are provided around the central opening, wherein the first direction mounting hole and the second direction mounting hole are opened in the main body after the mounting bracket is fixed to the mounting plate.

[0010] A central opening is incorporated into the main body. This design reduces the weight of the main body, facilitating its movement by workers. Furthermore, the central opening allows for easy observation of the positioning pointer's position on the rocket's propellant tank. Positional errors are unavoidable during the machining of the main body and the fixing of the mounting bracket to the mounting plate. Therefore, the technical solution of creating the mounting holes for the positioning pointer in the main body after fixing the mounting bracket to the mounting plate avoids the adverse effects caused by the accumulation of positional errors, making it easier to machine mounting holes with sufficiently high positioning accuracy into the main body.

[0011] Preferably, the central opening is rectangular in shape, the first directional positioning pointer includes two first directional positioning pointers respectively disposed on both sides of the central opening in the first direction, the second directional positioning pointer includes two second directional positioning pointers respectively disposed on both sides of the central opening in the second direction, and when the two first directional positioning pointers are aligned with a preset first directional reference line on the rocket propellant tank and the two second directional positioning pointers are aligned with a preset second directional reference line on the rocket propellant tank, the mounting bracket fixed to the mounting plate is located at the predetermined position on the rocket propellant tank.

[0012] According to geometric principles, a plane can be defined using three points that are not collinear. This means that the entire main body can be positioned using any three of the two first-direction positioning pointers and two second-direction positioning pointers. However, both the work of drawing the first and second direction reference lines on the rocket propellant tank and the work of drilling the mounting holes for the positioning pointers on the main body of the positioning fixture can introduce errors. To minimize or even avoid these errors, two first-direction positioning pointers and two second-direction positioning pointers are used simultaneously for positioning in two directions (i.e., the first and second directions). If the two first-direction positioning pointers accurately contact the first direction reference line, and the two second-direction positioning pointers accurately contact the second direction reference line, then it can be determined that the first and second direction reference lines drawn on the rocket propellant tank are accurate, the mounting holes for the positioning pointers drilled on the main body of the positioning fixture are also accurate, and the main body of the positioning fixture is accurately positioned relative to the rocket propellant tank at the predetermined location.

[0013] Consider the following scenario: The design requires the first and second direction reference lines to be perpendicular. The actual first direction reference line and the mounting holes for the positioning pointers accurately meet the design requirements. However, the actual second direction reference line has an angle of inclination relative to the first direction reference line that exceeds the allowable range. In this case, if two first-direction positioning pointers are brought into contact with the first direction reference line, one second-direction positioning pointer can also contact the second direction reference line, but both second-direction positioning pointers cannot simultaneously contact the second direction reference line. Therefore, errors in the predetermined positioning reference can be detected promptly.

[0014] Preferably, the mounting plate includes two mounting plates respectively disposed at both ends in the length direction of the main body.

[0015] By installing two mounting plates on the main body of the positioning fixture, the positioning of two mounting brackets can be achieved simultaneously through a single positioning operation of the main body, significantly reducing the amount of on-site positioning work. Furthermore, the length of the positioning fixture can be easily selected based on the distance between the two mounting brackets.

[0016] Preferably, at least one handle is provided on the main body.

[0017] By installing handles on the main body, workers can easily move and position the fixture during operation, enabling rapid positioning. When multiple handles are installed on the main body, multiple workers can hold it simultaneously, or workers can flexibly perform the holding action from different positions.

[0018] Preferably, at least one pre-positioning pointer is provided on the main body, including a pre-positioning pointer located at the center of one side of the main body.

[0019] Using pre-positioning pointers helps workers quickly place positioning fixtures near predetermined locations on rocket propellant tanks. For example, if the pre-positioning pointer is located in a first (or second) direction, moving the positioning fixture allows the pointer to fall onto a first (or second) direction reference line on the rocket propellant tank, achieving rapid positioning of the fixture relative to that direction. When the positioning fixture is large or heavy, especially when multiple workers need to coordinate its movement, using one or more pre-positioning pointers can significantly improve operational efficiency.

[0020] Preferably, the main body is provided with three openings, and the central opening is one of the three openings located in the center.

[0021] By setting three openings in the main body, the weight of the main body can be further reduced, making it easier to operate.

[0022] Preferably, the three openings are arranged in the body along the longitudinal direction of the body.

[0023] Preferably, a handle is provided between any two adjacent openings.

[0024] Preferably, the mounting bracket is a mounting bracket for gas cylinders.

[0025] According to another aspect of this utility model, a method for using a positioning fixture is provided, wherein the positioning fixture is the positioning fixture according to the foregoing aspect. The method of use includes:

[0026] The step of determining the installation position of the positioning pointer includes, with the mounting bracket fixed on the mounting plate of the positioning fixture, a first direction mounting hole for installing the first direction positioning pointer and a second direction mounting hole for installing the second direction positioning pointer are opened on the main body.

[0027] The step of determining the reference position of the positioning tooling includes determining the reference position for the positioning tooling on the rocket propellant tank, and drawing a first direction reference line and a second direction reference line on the rocket propellant tank based on the reference position.

[0028] The positioning tooling pre-positioning step, wherein, after completing the positioning pointer installation position determination step and the positioning tooling reference position determination step, the positioning tooling is placed on the rocket propellant tank near the reference position;

[0029] The precise positioning step of the positioning fixture includes, after completing the pre-positioning step of the positioning fixture, using a first-direction positioning pointer installed in the first-direction mounting hole to contact the first-direction reference line, and using a second-direction positioning pointer installed in the second-direction mounting hole to contact the second-direction reference line, so that the positioning fixture is positioned at the reference position on the rocket propellant tank within a predetermined accuracy range; and

[0030] The mounting bracket fixing step involves fixing the mounting bracket to the rocket storage tank after the precise positioning step of the positioning tool is completed.

[0031] When using the positioning fixture, reference points for positioning operations are established on both the positioning fixture and the rocket propellant tank through steps to determine the installation position of the positioning pointers and to determine the reference position of the positioning fixture. The reference point on the positioning fixture is determined collaboratively by the positioning pointers installed in the mounting holes, while the reference point on the rocket propellant tank is determined collaboratively by various reference lines. During on-site positioning operations, it is only necessary to ensure that each positioning pointer contacts its corresponding reference line to achieve accurate positioning of the positioning fixture relative to the reference position on the rocket propellant tank. Therefore, the on-site positioning operation is highly efficient and accurate.

[0032] Preferably, in the positioning fixture pre-positioning step, after the positioning fixture is placed on the rocket propellant tank, a first direction positioning pointer is installed in the first direction mounting hole, and a second direction positioning pointer is installed in the second direction mounting hole.

[0033] Installing the positioning pointer after placing the positioning fixture on the rocket propellant tank can prevent unwanted deformation of the pointer due to collisions during the transportation and handling of the positioning fixture. After installing the positioning pointer, subsequent positioning operations can proceed.

[0034] Preferably, in the positioning tooling pre-positioning step, the positioning tooling is located near the reference position on the rocket tank by using at least one pre-positioning pointer provided on the main body to contact the first direction reference line or the second direction reference line.

[0035] Using a pre-positioning pointer can help workers quickly move the positioning tool to the vicinity of a predetermined position on the rocket propellant tank.

[0036] Preferably, the central opening is rectangular in shape, the first direction positioning pointer includes two first direction positioning pointers respectively disposed on both sides of the central opening in the first direction, and the second direction positioning pointer includes two second direction positioning pointers respectively disposed on both sides of the central opening in the second direction. In the precise positioning step of the positioning fixture, when both first direction positioning pointers are in contact with the first direction reference line and both second direction positioning pointers are in contact with the second direction reference line, it is determined that the positioning fixture is positioned at the reference position within a predetermined accuracy range.

[0037] By simultaneously contacting the corresponding first-direction and second-direction reference lines with two first-direction positioning pointers and two second-direction positioning pointers, high-precision positioning can be performed accurately, and it is also beneficial to promptly detect problems when there are errors in the pre-determined positioning references.

[0038] This utility model has at least the following technical effects:

[0039] The positioning fixture provided by this utility model can reduce the amount of on-site positioning work during the process of fixing the mounting bracket for accessories to the bottom of the rocket tank, while ensuring that the mounting bracket is positioned with high precision on the bottom of the tank. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a schematic perspective view of a positioning fixture according to an exemplary embodiment of the present invention, showing the positioning fixture positioned on a rocket propellant tank.

[0042] Figure 2 This is a top view of the positioning fixture.

[0043] Figure 3 The 3D view of the positioning fixture shows the case without the bracket installed.

[0044] Figure 4 This is a perspective view of the positioning fixture, showing the mounting bracket being fixed to the positioning fixture.

[0045] Figure 5 A schematic perspective view showing the positioning fixture positioned on the rocket propellant tank.

[0046] Figure 6 A schematic three-dimensional view showing the baseline on the rocket propellant tank.

[0047] Figure 7 A schematic perspective view showing the positioning fixture pre-positioned relative to the rocket propellant tank.

[0048] Figure 8 A schematic perspective view illustrating the operation of precisely positioning the positioning fixture relative to the rocket propellant tank.

[0049] Figure 9 A schematic perspective view showing the mounting bracket positioned on the rocket propellant tank.

[0050] Figure 10 A schematic perspective view showing the mounting bracket welded to the rocket propellant tank.

[0051] Figure 11 This is a flowchart illustrating a method of using a positioning tool according to another exemplary embodiment of the present invention.

[0052] Explanation of reference numerals in the attached figures:

[0053] 1. Tooling; 10. Main body; 11. Handle; 12. Mounting plate; 13. Pre-positioning pointer; 101. X-direction positioning pointer; 102. Y-direction positioning pointer; 111. X-direction screw hole; 112. Y-direction screw hole; 121. Mounting hole; 2. Rocket tank; 2X, X-reference line; 2Y, Y-reference line; 3. Mounting bracket; 4. Welding machine. Detailed Implementation

[0054] The features and exemplary embodiments of various aspects of this utility model will be described in detail below. To make the objectives, technical solutions, and advantages of this utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain this utility model and to exemplarily illustrate the principles of this utility model, and are not configured to limit this utility model. In addition, the structural components in the drawings are not necessarily drawn to scale. For example, the dimensions of some structural components or regions in the drawings may be enlarged for other structural components or regions to aid in the understanding of the embodiments of this utility model.

[0055] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the embodiments of this utility model. In the description of this utility model, it should be noted that, unless otherwise stated, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0056] Furthermore, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure or component that includes a list of elements includes not only those elements but also other structural elements that are not expressly listed or inherent to the structure or component. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or apparatus that includes the element.

[0057] Spatial relation terms such as "below," "under," "under," "low," "above," "on," and "high" are used for descriptive convenience to explain the positioning of one element relative to a second element, indicating that these terms are intended to cover different orientations of the device, in addition to those different from those shown in the figure. Furthermore, phrases such as "one element on / below another element" can indicate that two elements are in direct contact, or that there are other elements between the two elements. In addition, terms such as "first" and "second" are also used to describe individual elements, areas, parts, etc., without specifically indicating order or sequence, and should not be considered restrictive. Similar terms are used throughout the description to represent similar elements.

[0058] For those skilled in the art, this invention can be implemented without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by illustrating examples.

[0059] In this embodiment, there may be descriptions such as "staff". Those skilled in the art should understand that the description of "staff" is only for the convenience of describing the embodiments of this utility model. It is just an exemplary general concept and is not specifically limited to a particular person.

[0060] First Embodiment

[0061] According to a first embodiment of this utility model, a positioning fixture (hereinafter referred to as the fixture) is provided, which is suitable for positioning mounting brackets for installing accessories on the bottom of a rocket propellant tank. The accessories can be gas cylinders, etc. However, the technical concept of this embodiment is also applicable to the positioning of other accessories on the rocket propellant tank.

[0062] like Figures 1 to 4 As shown, the tooling 1 includes a main body 10, a handle 11, and a mounting plate 12. The tooling 1 is used to position the mounting bracket 3 onto the rocket propellant tank 2 with high precision. The mounting bracket 3 is, for example, a mounting bracket for a gas cylinder. Figure 1 This illustration shows the positioning of two mounting brackets 3 at predetermined locations on the bottom of the rocket propellant tank 2. These predetermined locations are determined based on the rocket's design. Figure 1 The two reference lines shown for high-precision positioning, namely the X reference line and the Y reference line, are determined based on the predetermined positions of the two mounting brackets 3. The Y reference line corresponds to the line connecting the two mounting brackets 3, the X reference line is perpendicular to the Y reference line, and the intersection of the X reference line and the Y reference line is located at the midpoint between the two mounting brackets 3. The X direction indicated by the X reference line is an example of a first direction, and the Y direction indicated by the Y reference line is an example of a second direction.

[0063] In the following text, for ease of explanation, the position represented by the cross-shaped line formed by the X and Y reference lines on the rocket propellant tank 2 will be referred to as the reference position. This reference position is used to guide the operator in positioning the tooling 1 during the positioning operation. When the tooling 1 is accurately positioned at this reference position, the two mounting brackets 3 will be positioned accordingly at their predetermined positions on the rocket propellant tank 2.

[0064] like Figure 1 and Figure 2 As shown, the main body 10 is flat and rectangular, with its length direction corresponding to... Figure 2 The left and right directions are shown in the drawing. Multiple handles 11 are provided on the main body 10 for workers to hold. Figure 1 The diagram shows a configuration with four handles 11, allowing multiple workers to grip the handle simultaneously or flexibly from different positions. However, the number of handles 11 is not limited to this; it can be more or less. Handles may not be required if they do not interfere with positioning operations on-site. Furthermore, the position of the handles 11 is not limited to the configuration shown in the diagram and can be flexibly arranged according to the actual situation.

[0065] like Figure 2 As shown, two mounting plates 12 are respectively disposed at both ends of the main body 10 along its length. The mounting plates 12 are used to fix the mounting bracket 3.

[0066] In this embodiment, the mounting plate 12 is fixed to the main body 10 by a threaded connection. However, it is not limited to this; the mounting plate 12 can also be connected to the main body 10 by riveting or welding, or it can be designed as an integral part of the main body 10. Furthermore, the mounting plate 12 can be designed to be connected to the main body 10 in a movable manner, for example, slidable or pivotable. Where the high-precision positioning requirements of the mounting bracket 3 can be met, a suitable method can be flexibly selected to connect the mounting plate 12 to the main body 10.

[0067] The main body 10 has multiple rectangular openings A to reduce the weight of the entire main body 10. Figure 2 The diagram shows a case with three openings A, where the central opening A is an example of a central opening. The three openings A are located along the longitudinal direction of the main body 10 (i.e.,...). Figure 2 The left and right directions (in the middle) are provided in the main body 10. A handle 11 can be provided between any two adjacent openings A. Two X-direction screw holes 111 are provided on both sides of the central opening in the X direction, and two Y-direction screw holes 112 are provided on both sides of the central opening in the Y direction. The X-direction screw hole 111 is an example of a first-direction mounting hole, used to mount the X-direction positioning pointer 101. The Y-direction screw hole 112 is an example of a second-direction mounting hole, used to mount the Y-direction positioning pointer 102. Figure 8 As shown, the central opening also serves as an observation window during positioning operations, allowing staff to observe the positions of the X-direction positioning pointer 101 and the Y-direction positioning pointer 102 on the rocket storage tank 2.

[0068] To facilitate subsequent positioning operations, this embodiment adopts the following design: Figure 2 In this configuration, the line connecting the two Y-direction screw holes 112 corresponds to the length direction of the main body 10, the line connecting the two X-direction screw holes 111 is perpendicular to the length direction of the main body 10, and the intersection of the line connecting the two Y-direction screw holes 112 and the line connecting the two X-direction screw holes 111 corresponds to the geometric center of the main body 10. In subsequent positioning operations, when the two X-direction positioning pointers 101 installed in the two X-direction screw holes 111 contact the X reference line 2X on the rocket propellant tank 2, and the two Y-direction positioning pointers 102 installed in the two Y-direction screw holes 112 contact the Y reference line 2Y on the rocket propellant tank 2, it ensures that the tooling 1 is accurately positioned relative to the predetermined position on the rocket propellant tank 2, thereby accurately positioning the two mounting brackets 3 in the predetermined position. With accurate positioning, the intersection of the X reference line 2X and the Y reference line 2Y is aligned with the geometric center of the main body 10.

[0069] like Figure 2 As shown, four mounting holes 121 are formed on each mounting plate 12, and these four mounting holes 121 are arranged according to... Figure 2 The mounting brackets 3 are arranged symmetrically at the four corners of the mounting plate 12 in the vertical and horizontal directions, as shown in the drawing. The mounting holes 121 can be screw holes to facilitate fixing the mounting brackets 3 to the mounting plate 12 with screws or bolts. In this embodiment, the distance D along the length direction of the main body 10, determined by the four mounting holes 121 on the inner side of the main body 10 on the two mounting plates 12, is used to represent the distance between the two mounting brackets 3. When manufacturing the tooling 1, the length tolerance of this distance D is required to be kept within the expected accuracy range.

[0070] Figure 3 The diagram shows a case where the mounting bracket 3 is not installed on the tooling 1, and the X-direction positioning pointer 101 and the Y-direction positioning pointer 102 are not installed in the X-direction screw hole 111 and the Y-direction screw hole 112. Figure 4 The diagram shows the case where mounting brackets 3 are fixed to fixture 1. It's important to note that during the manufacturing of fixture 1, to meet subsequent high-precision positioning requirements, the two mounting brackets 3 must first be fixed to the mounting plate 12. Then, the two mounting brackets 3 are fixed in their intended positions to prevent the entire fixture 1 from moving. At this point, screw holes 111 in the X direction and 112 in the Y direction are then drilled around the central opening, according to the intended positions. This is because there is a tolerance in the distance D, and there is also a tolerance in the positions of the X-direction screw holes 111 and Y-direction screw holes 112 when drilling. Drilling the holes after fixing the mounting brackets 3 is equivalent to determining the hole positions based on the actual positions of the mounting brackets 3, thus effectively avoiding the decrease in accuracy caused by the accumulation of tolerances.

[0071] It should be noted that in this embodiment, threaded connections are used to connect the X-direction positioning pointer 101 and the Y-direction positioning pointer 102 to the X-direction threaded holes 111 and 112, respectively. Threaded connections offer advantages such as accurate positioning and a robust, reliable connection, ensuring that the X-direction positioning pointer 101 and the Y-direction positioning pointer 102 are not prone to shaking even when in contact with the rocket propellant tank 2 during positioning, thus helping to maintain their positioning accuracy. However, other connection methods can be used instead of threaded connections to ensure positioning accuracy.

[0072] like Figures 2 to 4 As shown, a pre-positioning pointer 13 is also provided at the center of the two long sides of the main body 10. The pre-positioning pointer 13 is used to help the operator quickly place the tooling 1 near the reference position on the rocket propellant tank 2 during positioning.

[0073] Second Embodiment

[0074] This embodiment is an example of how to use tool 1 in the first embodiment. Figure 8This is a schematic flowchart of this embodiment. According to this embodiment, as... Figure 5 As shown, the tooling 1 of the first embodiment can be used to position the two mounting brackets 3 at predetermined positions on the rocket propellant tank 2. The steps included in the usage method of this embodiment are described in detail below with reference to the accompanying drawings.

[0075] [Steps for determining the installation location of the positioning pointer]

[0076] In this step, with the mounting bracket 3 fixed on the mounting plate 12 of the tooling 1, screw holes 111 in the X direction and 112 in the Y direction are opened at predetermined positions on the main body 10. For example, in the production workshop, according to the design plan, the two mounting brackets 3 installed on the tooling 1 are first fixed in the desired positions, and then the correct positions for opening the screw holes 111 in the X direction and 112 in the Y direction are determined on the main body 10 according to the design plan, and then the hole opening operation is performed.

[0077] [Steps for determining the reference position of positioning tooling]

[0078] In this step, a reference position for tooling 1 is determined on the rocket propellant tank 2, and an X reference line 2X and a Y reference line 2Y are drawn on the rocket propellant tank 2 based on this reference position. Figure 6 As shown, the reference position on rocket propellant tank 2 can be easily seen by the cross-shaped lines formed by the X and Y reference lines. It should be noted that in actual operation, the mounting bracket 3 was not yet installed on rocket propellant tank 2 when the X and Y reference lines were drawn. Figure 6 The locations of the two mounting brackets are only schematically marked for the convenience of those skilled in the art, and do not represent that there are actually two mounting brackets 3 at this time.

[0079] [Pre-positioning steps for positioning fixtures]

[0080] In this step, after completing the steps of determining the installation position of the positioning pointer and the reference position of the positioning fixture, the fixture 1 is placed on the rocket propellant tank 2 near the reference position marked by the X and Y reference lines. Then, the X-direction positioning pointer 101 is installed in the X-direction screw hole 111, and the Y-direction positioning pointer 102 is installed in the Y-direction screw hole 112.

[0081] In this step, the pre-positioning operation can be completed quickly with the help of the pre-positioning pointer 13. For example... Figures 2 to 4As shown, the pre-positioning pointer 13 is set at the center of the long side of the main body 10, thus roughly reflecting the center position of the main body 10 along its length. During the movement of the tooling 1, the operator observes whether the pre-positioning pointer 13 contacts the Y-reference line 2Y to determine whether the tooling 1 is near the reference position in the Y direction. This process can be simply referred to as pre-positioning in the Y direction.

[0082] Furthermore, the position of the main body 10 in the X direction can be easily observed through the central opening, thus completing the pre-positioning in the X direction. Of course, a similar method to the pre-positioning process in the Y direction can also be used to complete the pre-positioning in the X direction using a pre-positioning pointer.

[0083] [Precise Positioning Steps Using Positioning Fixtures]

[0084] In this step, after completing the pre-positioning step of the positioning fixture, the X-direction positioning pointer 101 contacts the X-reference line 2X, and the Y-direction positioning pointer 102 contacts the Y-reference line 2Y, so that the fixture 1 is positioned at the reference position on the rocket propellant tank 2 within a predetermined accuracy range. The positioning operation in this step aims to achieve accurate positioning of the fixture 1 on the rocket propellant tank 2. Figure 7 and Figure 8 As shown, during this step, the contact between each positioning pointer and the corresponding baseline can be observed through the central opening.

[0085] When the X-reference line 2X, Y-reference line 2Y, X-direction positioning pointer 101, and Y-direction positioning pointer 102 are all accurately positioned to the required accuracy, and when both X-direction positioning pointers 101 are in contact with the X-reference line 2X and both Y-direction positioning pointers 102 are in contact with the Y-reference line 2Y, it can be determined that the tooling 1 has been accurately positioned at the reference position on the rocket propellant tank 2 within the predetermined accuracy range. At this time, the two mounting brackets 3 are also accurately positioned at the predetermined positions on the rocket propellant tank 2.

[0086] In addition, it should be noted that even if only one X-direction positioning pointer 101 and one Y-direction positioning pointer 102 are set, as long as the X-reference line 2X, Y-reference line 2Y, X-direction positioning pointer 101 and Y-direction positioning pointer 102 are each accurately formed with the required accuracy, the tooling 1 can still be accurately positioned by referring to the usage method of this embodiment.

[0087] [Steps to fix the positioning bracket]

[0088] In this step, after the precise positioning step of the positioning fixture is completed, the mounting bracket 3 is fixed to the rocket tank 2. Figure 9This illustrates the situation where, after the precise positioning step of the positioning fixture is completed, the mounting bracket 3 is positioned relative to the rocket propellant tank 2 in the predetermined position. Then, as... Figure 10 As shown, the welding machine 4 can be used to perform fillet welding to fix the mounting bracket 3 to the rocket propellant tank 2. Then, the connection between the mounting bracket 3 and the mounting plate 12 is disconnected, the tooling 1 is removed, and the installation of the mounting bracket 3 on the rocket propellant tank 2 is completed.

[0089] The method of fixing the mounting bracket 3 to the rocket tank 2 is not limited to... Figure 10 The fillet weld shown can also be made in other ways, as long as the technical requirements are met.

[0090] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A positioning fixture for installing a mounting bracket at a predetermined position on a rocket propellant tank, wherein, The positioning fixture includes at least a main body and a mounting plate disposed at at least one end of the main body, the mounting plate being used to fix the mounting bracket, characterized in that... The main body is flat, and it has at least a central opening in the center. At least one first-direction positioning pointer and at least one second-direction positioning pointer are provided around the central opening. The first-direction positioning pointer is used to determine the position of the body in a predetermined first direction, and the second-direction positioning pointer is used to determine the position of the body in a predetermined second direction.

2. The positioning fixture according to claim 1, characterized in that, In the main body, a first direction mounting hole for mounting the first direction positioning pointer and a second direction mounting hole for mounting the second direction positioning pointer are provided around the central opening, wherein, The first directional mounting hole and the second directional mounting hole are opened in the main body after the mounting bracket is fixed to the mounting plate.

3. The positioning fixture according to claim 1 or 2, characterized in that, The central opening is rectangular in shape. The first direction positioning pointer includes two first direction positioning pointers respectively disposed on both sides of the central opening in the first direction. The second direction positioning pointer includes two second direction positioning pointers respectively disposed on both sides of the central opening in the second direction, and When the two first direction positioning pointers are aligned with the preset first direction reference line on the rocket propellant tank and the two second direction positioning pointers are aligned with the preset second direction reference line on the rocket propellant tank, the mounting bracket fixed to the mounting plate is located at the predetermined position on the rocket propellant tank.

4. The positioning fixture according to claim 1 or 2, characterized in that, The mounting plate includes two mounting plates respectively disposed at both ends of the main body along its length.

5. The positioning fixture according to claim 1 or 2, characterized in that, At least one handle is provided on the main body.

6. The positioning fixture according to claim 1 or 2, characterized in that, At least one prepositioning pointer is provided on the main body, including a prepositioning pointer located at the center of one side of the main body.

7. The positioning fixture according to claim 1 or 2, characterized in that, The main body has three openings, and the central opening is the one located in the center of the three openings.

8. The positioning fixture according to claim 7, characterized in that, The three openings are arranged in the body along the longitudinal direction of the body.

9. The positioning fixture according to claim 7, characterized in that, A handle is provided between any two adjacent openings.

10. The positioning fixture according to claim 1 or 2, characterized in that, The mounting bracket is a mounting bracket for gas cylinders.

Images