A positioning assembly device and design method for tightening a threaded connection structure

Abstract

A positioning and assembly device for tightening a threaded connection structure belongs to the technical field of precision instrument assembly. The device comprises a base plate, a product clamping table, a positioning table and a tightening module; the product clamping table, the positioning table and the tightening module are installed on the base plate in sequence from left to right; the product clamping table can rotate and adjust the product for placement, so as to achieve fast and lossless positioning and clamping of the product; the positioning table ensures that the screwdriver does not shake or deviate during the tightening operation, and reliably locks the position of the screwdriver on the horizontal plane; the tightening module comprises a balancing bracket, a screwing assembly and a positioning assembly, so as to achieve fast replacement of screwdrivers of different specifications, making the device more flexible and diverse in use; the present invention can be applied to the assembly of threaded connection structures of different types of precision instruments, prevent problems such as the screwdriver tilting, shaking, and coming out of the hand, and ensure the stability and reliability of the entire tightening operation process.

Description

Technical Field

[0001] The invention relates to a positioning assembly device and a design method for tightening a threaded connection structure, belonging to the technical field of precision instrument assembly. Background Art

[0002] As the requirements for precision and stability of precision instruments in the fields of aviation, aerospace, navigation, weapons, etc. continue to increase, the assembly quality of mechanical structures is also being put forward higher and higher requirements. Among them, threaded connection has become the most widely used assembly connection method because it can obtain a large connection force, is easy to assemble and disassemble, and the connectors are easy to mass produce through standardization. In addition, the connection cost is low, the connectors are cheap, and they are interchangeable.

[0003] The threaded connection structures in precision instruments are generally small in size, require high assembly accuracy, and are afraid of damage from bumps and collisions. Therefore, it is not suitable to manually tighten the screws with a screwdriver. The screwdriver often tilts, becomes misplaced, or comes out of the hand. These problems can cause threaded assembly failure at best, or even damage the entire product at worst. Summary of the invention

[0004] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art and provide a positioning assembly device and a design method for tightening a threaded connection structure, which can be applied to the assembly of threaded connection structures of different types of precision instruments, prevent the screwdriver from tilting, shaking, or coming out of the hand, and ensure the stability and reliability of the entire tightening operation process.

[0005] The technical solution of the present invention is:

[0006] A positioning assembly device for tightening a threaded connection structure, comprising: a base plate, a product clamping platform, a positioning platform and a tightening module; the product clamping platform comprises a rotary displacement platform and a tooling fixture;

[0007] Among them, the product clamping table, positioning table and tightening module are installed on the bottom plate from left to right in sequence; the rotation displacement table is fixed to the bottom plate by screws, which is used to rotate and adjust the product for tightening operations; the tooling fixture is fixed to the rotation displacement table by screws, which is used to position and clamp the product;

[0008] The positioning table is used to limit the position of the tightening module, and the tightening module is used to tighten the product and is installed on the base plate by screws.

[0009] Further, the positioning platform includes a positioning mounting block, a toggle clamp, a support seat, a positioning hole plate, a guide shaft and a linear bearing;

[0010] The two mounting blocks are fixed to the base plate with screws, the support seat is positioned against the two mounting blocks, and then the support seat is clamped with two elbow clamps. The four guide shafts are tightened and fixed in the four threaded holes of the support seat through the external threads at one end thereof, and the four linear bearings are fixed to the positioning hole plate with screws. The four linear bearings are sleeved on the four guide shafts, so that the positioning hole plate can be quickly replaced and installed.

[0011] Further, the tightening module includes a balancing bracket, a positioning component and a screwing component;

[0012] The balancing bracket is installed on the base plate by screws, and is used for translation, lifting, and rotation of the positioning component and the screwing component within a certain range; the positioning component is installed on the screwing component by screws, and is used to limit the position of the screwing component; the screwing component is installed on the balancing bracket by screws, and is used to tighten the product.

[0013] Furthermore, the screwing assembly further comprises: a mounting frame, a bearing, a sleeve and a screwdriver; the power source of the screwdriver is manual or electric;

[0014] When the power source of the screwdriver is manual, the mounting frame is mounted on the balancing bracket by screws, the outer ring of the bearing is mounted on the mounting frame, and the screwdriver is fixed to the sleeve by a jackscrew and then mounted on the inner ring of the bearing;

[0015] When the power source of the screwdriver is electric, the mounting frame is mounted on the balancing bracket by screws, and after the screwdriver is fixed to the sleeve by a top screw, the sleeve is mounted on the mounting frame by screws.

[0016] Furthermore, the positioning assembly further comprises: a positioning plate and a positioning shaft;

[0017] The positioning plate is mounted on the mounting frame through screws, and the positioning shaft is mounted in the threaded hole of the positioning plate through its external threaded end.

[0018] Furthermore, the present invention also provides a positioning and assembling method for tightening and positioning an assembly device for a threaded connection structure, comprising the following steps:

[0019] The first step is to place the product on the fixture;

[0020] The second step is to adjust the rotation stage to position the threaded hole on the product that needs to be tightened at the designed point (a, b), and then fix the rotation stage; the position of the product threaded hole on the base plate coordinate system is (a, b);

[0021] The third step is to use the balancing bracket to move the screwdriver to the threaded hole on the product that needs to be tightened;

[0022] Step 4: Move the screwdriver downward and insert the positioning shaft into the corresponding hole of the positioning hole plate;

[0023] Step 5: Continue to move the screwdriver downward and tighten the fasteners on the product to complete the tightening and assembly operation;

[0024] Step 6. Move the screwdriver upward until the positioning shaft leaves the positioning hole plate, and the screwdriver returns to its original position through the balance bracket.

[0025] Furthermore, the present invention also proposes a design method for a tightening positioning assembly device for a threaded connection structure, comprising the following steps:

[0026] The first step is to set the height of the part of the product to be tightened from the upper plane of the bottom plate to A;

[0027] The second step is to set the height of the top surface of the positioning hole plate from the upper plane of the bottom plate to B;

[0028] Step 3: Set the relative height between the bottom of the screwdriver head and the bottom surface of the positioning plate to C;

[0029] Step 4: Set the relative height between the bottom end of the screwdriver head and the bottom surface of the positioning shaft to D, and 8≤D≤10mm;

[0030] The fifth step is to set constraints to determine whether the product is applicable.

[0031] Furthermore, the fifth step sets constraint conditions to determine whether the product is applicable, specifically: according to the device design principle B≥C+D and BC<A<B, determine whether the product is applicable. If both conditions are met, it is applicable, otherwise C or D is modified.

[0032] Furthermore, the corresponding hole positions of the positioning hole plate are determined by the following steps:

[0033] The first step is to establish the base plate coordinate system, with the bottom corner of the base plate as point (0,0);

[0034] The second step is to select the product and determine the position of its threaded hole on the base plate coordinate system as (a, b);

[0035] The third step is to determine the position where the balancing bracket is installed on the base plate coordinate system as (c, d);

[0036] Step 4: Determine the relative distance between the screwdriver and the positioning axis as e;

[0037] Step 5, setting the position of the target hole on the positioning hole plate on the base plate coordinate system to (f, g);

[0038] Step 6: Design a calculation formula to calculate the value of (f, g);

[0039] In the seventh step, the position (f, g) of the target hole on the positioning hole plate on the base plate coordinate system is converted into the position on the positioning hole plate, and then processing and manufacturing can be carried out.

[0040] Furthermore, the position of the target hole on the positioning hole plate in the base plate coordinate system is (f, g) and is calculated as follows:

[0041]

[0042] (fa) 2 +(bg) 2 =e 2 .

[0043] The beneficial effects of the present invention compared with the prior art are:

[0044] (1) The present invention realizes flexible and non-destructive quick-change clamping of products through a product clamping table. It only needs to replace the tooling fixture to realize the tightening operation of different types of products;

[0045] (2) The present invention uses a positioning platform to achieve positioning guidance when the screwdriver is manually operated to move downward, and does not cause any interference or loss to the tightening process value applied by the screwdriver;

[0046] (3) The present invention uses a balancing bracket in the tightening module to make the screwdriver move more freely and conveniently, ensuring that the screwdriver always tightens the screw at a vertical angle of 90 degrees, thereby reducing operator errors, improving the assembly quality of threaded connections, reducing product quality problems, and improving labor production efficiency;

[0047] (4) The present invention realizes the rapid replacement of screwdrivers of different specifications by tightening the screwing components in the module, making the device more flexible and diverse in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is the overall layout front view of the present invention;

[0049] Figure 2 It is a top view of the overall layout of the present invention;

[0050] Figure 3 This is a schematic diagram for calculating the height range of tightening stations for applicable products;

[0051] Figure 4 Schematic diagram of the calculation principle for hole position design on the positioning orifice plate. DETAILED DESCRIPTION

[0052] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0053] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0054] According to the current status of tightening operations on threaded connection structures on precision instruments in the fields of aviation, aerospace, navigation, weapons, etc., the following embodiments are particularly suitable for ordinary manual screwdrivers, and can also be simply modified to install electric screwdrivers. The threaded connection structures in precision instruments generally have the characteristics of small size, high assembly precision requirements, and fear of damage from bumps. At present, it is not suitable to tighten the screwdrivers manually, and the screwdrivers often tilt, misalign, and fall out of the hands. Therefore, in the following embodiments, the installation and positioning structure of the screwdriver is specially designed to ensure that the device can achieve stable and reliable tightening assembly of precision instruments.

[0055] Figure 1 and Figure 2 This is a schematic diagram of a positioning assembly device for tightening a threaded connection structure in one embodiment of the present invention. Figure 1 and Figure 2 In this embodiment, the positioning assembly device for tightening the threaded connection structure may include:

[0056] Base plate 10, product clamping table 20, positioning table 30, tightening module 40 and product 50;

[0057] The product clamping platform 20 includes a rotary translation platform 21 and a fixture 22;

[0058] The positioning platform 30 includes a positioning mounting block 31, a toggle clamp 32, a support seat 33, a positioning hole plate 34, a guide shaft 36 and a linear bearing 35;

[0059] The tightening module includes a balancing bracket 41, a screwing assembly 43, and a positioning assembly 42;

[0060] in,

[0061] The product clamping table 20, the positioning table 30 and the tightening module 40 are installed on the bottom plate 10 from left to right in sequence; the rotation displacement table 21 is fixed on the bottom plate 10 by screws, and is used to rotate and adjust the product 50 for tightening operation; the tooling fixture 22 is fixed on the rotation displacement table 21 by screws, and is used to position and clamp the product 50;

[0062] The positioning platform 30 is used to define the position of the tightening module 40 . The tightening module 40 is used to tighten the product 50 and is installed on the base plate 10 by screws.

[0063] The positioning platform 30 includes a positioning mounting block 31, a toggle clamp 32, a support seat 33, a positioning hole plate 34, a guide shaft 36 and a linear bearing 35;

[0064] The two mounting blocks 31 are fixed to the base plate 10 with screws, the support seat 33 is positioned against the two mounting blocks 31, and then the support seat 33 is clamped with two elbow clamps 32. The four guide shafts 36 are tightened and fixed in the four threaded holes of the support seat 33 through the external threads at one end thereof, and the four linear bearings 35 are fixed to the positioning hole plate 34 with screws. The four linear bearings 35 are sleeved on the four guide shafts 36, so that the positioning hole plate 34 can be quickly replaced and installed.

[0065] The tightening module includes a balancing bracket 41, a positioning component 42 and a screwing component 43;

[0066] The balancing bracket 41 is installed on the base plate 10 by screws, and is used for translating, lifting, and rotating the positioning component 42 and the screwing component 43 within a certain range; the positioning component 42 is installed on the screwing component 43 by screws, and is used to limit the position of the screwing component 43; the screwing component 43 is installed on the balancing bracket 41 by screws, and is used to tighten the product 50.

[0067] The screwing assembly 43 further includes: a mounting frame 434, a bearing 433, a sleeve 432 and a screwdriver 431; the power source of the screwdriver 431 is manual or electric;

[0068] When the power source of the screwdriver is manual, the mounting frame 434 is mounted on the balancing bracket 41 by screws, the outer ring of the bearing 433 is mounted on the mounting frame 434, and the screwdriver 431 is fixed to the sleeve 432 by a top screw and then mounted on the inner ring of the bearing 433;

[0069] When the power source of the screwdriver is electric, the mounting bracket 434 is mounted on the balancing bracket 41 by screws, and after the screwdriver 431 is fixed to the sleeve 432 by a top screw, the sleeve 432 is mounted on the mounting bracket 434 by screws.

[0070] The positioning assembly 42 further includes: a positioning plate 421 and a positioning shaft 422;

[0071] The positioning plate 421 is mounted on the mounting bracket 434 by means of screws, and the positioning shaft 422 is mounted in the threaded hole of the positioning plate 421 by means of its external threaded end.

[0072] Figure 3 , Figure 4 They are respectively the schematic diagram for calculating the height range of the tightening station applicable to the product and the schematic diagram for calculating the hole position design on the positioning hole plate. Figure 3 and Figure 4 In this embodiment, the design method of the positioning assembly device for tightening the threaded connection structure includes the following specific steps:

[0073] (1) Applicable product tightening station height range:

[0074] The first step is to set the height of the part of the product to be tightened from the upper plane of the bottom plate to A;

[0075] In the second step, it is known that the height between the top surface of the positioning hole plate and the upper plane of the bottom plate is B;

[0076] Step 3: It is known that the relative height between the bottom end of the screwdriver head and the bottom surface of the positioning plate is C;

[0077] Step 4: Set the relative height between the bottom of the screwdriver head and the bottom of the positioning shaft to D, and generally recommend 8≤D≤10mm;

[0078] The fifth step is to determine whether the product is applicable based on the device design principle B≥C+D, BC<A<B, otherwise modify C or D.

[0079] (2) Determination of the hole position on the positioning hole plate:

[0080] The first step is to establish the base plate coordinate system, with the bottom corner of the base plate as point (0,0);

[0081] The second step is to select a product and determine the position of its threaded hole on the base plate coordinate system as (a, b);

[0082] The third step is to determine the position where the balancing bracket is installed on the base plate coordinate system as (c, d);

[0083] Step 4: It is known that the relative distance between the screwdriver and the positioning axis is e;

[0084] Step 5, setting the position of the target hole on the positioning hole plate on the base plate coordinate system to (f, g);

[0085] Step 6: According to the formula

[0086] (fa) 2 +(bg) 2 =e 2 ,

[0087] The value of (f,g) can be calculated;

[0088] In the seventh step, the position of the target hole on the positioning hole plate on the base plate coordinate system is converted to (f, g) and then the position on the positioning hole plate is converted into the position on the positioning hole plate for processing and manufacturing.

[0089] The use process of the device is as follows (taking product 50 as an example):

[0090] The first step is to place the product 50 on a fixture;

[0091] The second step is to adjust the rotation platform 21, position the threaded hole on the product 50 that needs to be tightened at the designed point (a, b), and then fix the rotation platform 21;

[0092] Step 3: Move the screwdriver 431 to the top of the threaded hole on the product 50 that needs to be tightened by using the balancing bracket 41;

[0093] Step 4: Move the screwdriver 431 downward to insert the positioning shaft 422 into the corresponding hole of the positioning hole plate 34;

[0094] Step 5: Continue to move the screwdriver 431 downward to screw the fastener on the product 50 to complete the tightening assembly operation;

[0095] Step 6: Move the screwdriver 431 upward until the positioning shaft 422 leaves the positioning hole plate 34 , and the screwdriver 431 returns to its original position through the balancing bracket 41 .

[0096] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A design method for a positioning assembly device for tightening a threaded connection structure, characterized in that: The positioning and assembly device for tightening a threaded connection structure comprises: a base plate (10), a product clamping platform (20), a positioning platform (30) and a tightening module (40); the product clamping platform (20) comprises a rotation displacement platform (21) and a tooling fixture (22); The bottom plate (10) is provided with a product clamping platform (20), a positioning platform (30) and a tightening module (40) from left to right in sequence; the rotational displacement platform (21) is fixed to the bottom plate (10) by screws and is used to rotate and adjust the product (50) for easy tightening operation; the tooling fixture (22) is fixed to the rotational displacement platform (21) by screws and is used to position and clamp the product (50); the positioning platform (30) is used to limit the position of the tightening module (40), and the tightening module (40) is used to tighten the product (50) and is installed on the bottom plate (10) by screws; The positioning platform (30) comprises a positioning mounting block (31), a toggle clamp (32), a support seat (33), a positioning hole plate (34), a guide shaft (36) and a linear bearing (35); the two positioning mounting blocks (31) are fixed on the base plate (10) by screws, the support seat (33) is positioned against the two positioning mounting blocks (31), and the two toggle clamps (32) are used to clamp the support seat (33); the four guide shafts (36) are fixed in four threaded holes of the support seat (33) by screwing the external threads at one end thereof; the four linear bearings (35) are fixed on the positioning hole plate (34) by screws; the four linear bearings (35) are sleeved on the four guide shafts (36), so that the positioning hole plate (34) can be quickly replaced and installed; The tightening module comprises a balancing bracket (41), a positioning component (42) and a screwing component (43); the balancing bracket (41) is mounted on a base plate (10) by means of screws, and is used to translate, elevate and rotate the positioning component (42) and the screwing component (43) within a certain range; the positioning component (42) is mounted on the screwing component (43) by means of screws, and is used to limit the position of the screwing component (43); the screwing component (43) is mounted on the balancing bracket (41) by means of screws, and is used to perform a tightening operation on a product (50); The screwing assembly (43) comprises: a mounting frame (434), a bearing (433), a sleeve (432) and a screwdriver (431); the power source of the screwdriver (431) is manual or electric; when the power source of the screwdriver is manual, the mounting frame (434) is mounted on the balancing bracket (41) by means of screws, the outer ring of the bearing (433) is mounted on the mounting frame (434), the screwdriver (431) is fixed to the sleeve (432) by means of a top screw, and then is mounted to the inner ring of the bearing (433); when the power source of the screwdriver is electric, the mounting frame (434) is mounted on the balancing bracket (41) by means of screws, the screwdriver (431) is fixed to the sleeve (432) by means of a top screw, and then the sleeve (432) is mounted on the mounting frame (434) by means of screws; The positioning assembly (42) comprises: a positioning plate (421) and a positioning shaft (422); the positioning plate (421) is mounted on a mounting frame (434) by means of screws, and the positioning shaft (422) is mounted in a threaded hole of the positioning plate (421) by means of its external threaded end; Design methods include: The first step is to set the height of the part of the product to be tightened from the upper plane of the bottom plate to A; The second step is to set the height of the top surface of the positioning hole plate from the upper plane of the bottom plate to B; Step 3: Set the relative height between the bottom of the screwdriver head and the bottom surface of the positioning plate to C; Step 4: Set the relative height between the bottom end of the screwdriver head and the bottom surface of the positioning shaft to D, and 8≤D≤10mm; The fifth step is to set constraints to determine whether the product is applicable.

2. The design method according to claim 1, characterized in that: The fifth step sets constraint conditions to determine whether the product is applicable, specifically: according to the device design principle B≥C+D and BC<A<B, determine whether the product is applicable. If both conditions are met, it is applicable, otherwise C or D is modified.

3. The design method according to claim 1, characterized in that: The corresponding hole positions of the positioning hole plate (34) are determined by the following steps: The first step is to establish the base plate coordinate system, with the bottom corner of the base plate as point (0,0); The second step is to select the product and determine the position of its threaded hole on the base plate coordinate system as (a, b); The third step is to determine the position where the balancing bracket is installed on the base plate coordinate system as (c, d); Step 4: Determine the relative distance between the screwdriver and the positioning axis as e; Step 5, setting the position of the target hole on the positioning hole plate on the base plate coordinate system to (f, g); Step 6: Design a calculation formula to calculate the value of (f, g); In the seventh step, the position (f, g) of the target hole on the positioning hole plate on the base plate coordinate system is converted into the position on the positioning hole plate, and then processing and manufacturing can be carried out.

4. The design method according to claim 3, characterized in that: The position of the target hole on the positioning hole plate in the base plate coordinate system is (f, g) and is calculated as follows: (f-a) 2 +(b-g) 2 =e 2 。

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