Interference fit installation clamp for pressing metal column into plastic part

Abstract

The invention provides an interference fit mounting clamp for pressing a metal column into a plastic part. The interference fit mounting clamp comprises a base, a clamp positioning plate, a pushing air cylinder set, a buffer plate, a clamping plate and a self-centering clamping mechanism. A buffer plate and a clamping plate are arranged on the clamp positioning plate, a self-centering clamping mechanism is arranged on the edge of the clamping plate and is composed of a pressing rod and a limiting and fixing structure, and the coaxiality of a metal column and a plastic part can be accurately adjusted through reverse rotation of a connecting rod. The pushing cylinder is provided with a pushing rod which corresponds to the center of a clamping groove in the clamping plate, and accurate assembly is guaranteed. All the parts are connected through detachable bolts, and maintenance is convenient. An elastic assembly is arranged between the buffer plate and the clamping plate, impact force is absorbed, and parts are protected. The clamping force is finely adjusted through the adjusting bolt, and traceable control is achieved through scale marks. An elastic element is arranged between the pressing rod and the limiting structure, and stability is enhanced. The precise self-centering clamping device has the advantages of precise self-centering clamping and adjustable clamping force, is suitable for precise assembly of a metal column and a plastic part, improves the assembly efficiency and precision, and reduces the damage risk and the maintenance cost.

Description

Technical Field

[0001] The invention relates to the field of clamps, and in particular to an interference-fit installation clamp for a metal column pressed into a plastic part. Background Art

[0002] In modern industrial manufacturing, interference fit installation of metal columns and plastic parts is one of the common assembly techniques. Traditional installation methods often have problems such as low efficiency, low fitting accuracy, and easy damage to parts during installation. With the development of precision manufacturing technology, higher requirements are put forward for interference fit installation of metal columns and plastic parts. Interference fit refers to inserting one part into the hole of another part and applying a certain force to make the two parts fit tightly. This kind of fit can improve the stability and reliability of the product, but it also brings a series of challenges in the assembly process.

[0003] The traditional interference fit installation method of metal columns and plastic parts mainly relies on manual operation, which has the following problems: Low assembly efficiency: Manual operation is time-consuming and labor-intensive, and is not suitable for large-scale production.

[0004] Unstable matching accuracy: Manual operation makes it difficult to ensure the consistency of each assembly, resulting in fluctuations in product quality.

[0005] Fragile parts: During the assembly process, metal columns and plastic parts are easily damaged due to improper operation.

[0006] High labor intensity: Manual operation requires great physical strength, and long-term work can easily lead to worker fatigue.

[0007] Difficulty in cost control: Due to low assembly efficiency, production costs are difficult to effectively control.

[0008] This patent aims to provide a new type of fixture that can achieve efficient and precise installation of metal columns and plastic parts by accurately controlling the pressing force and speed, reduce damage during installation, and improve production efficiency and product quality. The fixture design takes into account ease of operation, cost-effectiveness and flexibility to adapt to parts of different sizes to meet the assembly needs of different industrial fields. Summary of the invention

[0009] The purpose of the present invention is to solve the shortcomings of the prior art and to provide an interference fit installation fixture for pressing a metal column into a plastic part.

[0010] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a metal column is pressed into a plastic part to form an interference fit installation fixture, comprising a base, a fixture positioning plate installed in the middle of the base, and a pushing cylinder group symmetrically arranged along the positioning plate; a buffer plate and a clamping plate are arranged above the fixture positioning plate in sequence; a self-centering clamping mechanism is also provided at the upper edge of the clamping plate; the self-centering clamping mechanism is composed of a pressure rod structure and a limit fixing structure; an adjusting bolt is provided on the limit fixing structure; a connecting rod is provided between the pressure rod structure and the limit fixing structure; the pressure rod structure and the limit fixing structure are rotated in opposite directions through the connecting rod; a cylinder control switch is also provided on the side of the upper surface of the base; the cylinder control switch is pneumatically connected to the pushing cylinder group through a pipeline.

[0011] Preferably, a pushing rod is provided in the middle of the pushing cylinder group; the pushing rod is telescopically movable within the pushing cylinder group; the clamping plate is symmetrically provided with clamping grooves; the pushing rod is tangent to the upper surface of the clamping plate; the pushing rod and the center of the clamping groove are arranged correspondingly.

[0012] Preferably, the fixture positioning plate and the base, the fixture positioning plate and the buffer plate, and the buffer plate and the clamping plate are fixedly connected by a detachable bolt structure.

[0013] Preferably, each group of the pushing cylinder groups is provided with a first fixing seat and a second fixing seat; an L-shaped connecting plate is provided at the connection between the first fixing seat, the second fixing seat and the base; and a rectangular baffle is also provided on the first fixing seat.

[0014] Preferably, at least two groups of elastic components are provided between the buffer plate and the card plate, and the elastic components include symmetrically distributed compression springs and guide columns; the guide columns penetrate the buffer plate and extend into the interior of the card plate, and a limit block is provided at the end for limiting the buffer stroke and ensuring elastic reset in the vertical direction.

[0015] Preferably, the inner wall of the clamping groove is provided with a guiding slope, and the inclination angle of the guiding slope is 15°-30°.

[0016] Preferably, the end of the adjusting bolt is provided with precision threads and scale markings; a corresponding threaded hole is provided on the limit fixing structure; the clamping force of the pressure rod structure can be fine-tuned by rotating the adjusting bolt, and the scale markings are used to quantify the adjustment amount and realize traceable control of the clamping force.

[0017] Preferably, an elastic element is further provided between the pressure rod structure and the limit fixing structure; the elastic element is a coil spring or a disc spring, and its two ends are respectively fixed to the hinge point of the pressure rod structure and below the adjustment bolt.

[0018] Compared with the prior art, the present invention has the following beneficial effects: precise self-centering clamping function: through the design of the self-centering clamping mechanism, combined with the pressure rod structure and the limit fixing structure, the coaxiality of the metal column and the plastic part can be automatically adjusted during the pressing process. This function is achieved through the precise matching of the clamping groove on the clamping plate and the push rod, ensuring the accurate centering of the metal column and the plastic part during the assembly process, avoiding assembly errors caused by poor centering.

[0019] Adjustable clamping force: The adjustment bolt on the limit fixing structure provides a precise clamping force adjustment mechanism. Users can fine-tune the clamping force of the pressure rod structure through the adjustment bolt according to actual needs, and the scale mark makes the clamping force adjustment process traceable. This design not only improves the flexibility of the assembly process, but also ensures the stability and consistency of the clamping force.

[0020] Optimization of buffer function: An elastic component is provided between the buffer plate and the card plate. Through the cooperation of the compression spring and the guide column, the impact force can be effectively absorbed and alleviated during the assembly process, thereby preventing excessive force from damaging the metal column and plastic parts. In addition, the limit block of the guide column also plays a role in limiting the buffer stroke, ensuring elastic reset in the vertical direction during the assembly process, and further improving the assembly accuracy and safety.

[0021] Efficient operation and control: The push cylinder group pushes the push rod to perform telescopic operation through pneumatic means. Combined with the design of the cylinder control switch, precise control and operation can be achieved. The matching of the push rod and the card plate enables the metal column to be stably pressed into the plastic part, improving assembly efficiency.

[0022] Easy disassembly and maintenance: All components are fixed with removable bolts, which is convenient for equipment maintenance and cleaning. At the same time, all key components can be quickly replaced, reducing equipment downtime and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an overall schematic diagram of the present invention; Figure 2 It is a schematic diagram of the self-centering clamping mechanism of the present invention; Figure 3 It is a schematic diagram of a card board of the present invention; Figure 4 This is a schematic diagram of the installation of the elastic component of the present invention; Figure 5 It is a three-dimensional schematic diagram of the present invention; In the figure: 1-base; 2-clamp positioning plate; 3-pushing cylinder group; 4-buffer plate; 5-card plate; 6-self-centering clamping mechanism; 7-cylinder control switch; 8-elastic component; 31-pushing rod; 32-first fixed seat; 33-second fixed seat; 34-connecting plate; 35-rectangular baffle; 51-clamping groove; 52-guide slope; 61-pressure rod structure; 62-limiting fixing structure; 63-adjusting bolt; 64-connecting rod; 81-compression spring; 82-guide column; 83-limiting block; 621-threaded hole; 631-precision thread; 632-scale mark. DETAILED DESCRIPTION

[0024] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed description is given in conjunction with the embodiments.

[0025] Please refer to Figures 1 to 5 The present invention provides an interference fit installation fixture for pressing a metal column into a plastic part, comprising a base 1, a fixture positioning plate 2 installed in the middle of the base 1, and a pushing cylinder group 3 symmetrically arranged along the fixture positioning plate 2; a buffer plate 4 and a clamping plate 5 are arranged in sequence above the fixture positioning plate 2; a self-centering clamping mechanism 6 is also arranged at the upper edge of the clamping plate 5; the self-centering clamping mechanism 6 is composed of a pressure rod structure 61 and a limit fixing structure 62; an adjusting bolt 63 is arranged on the limit fixing structure 62; a connecting rod 64 is arranged between the pressure rod structure 61 and the limit fixing structure 62; the pressure rod structure 61 and the limit fixing structure 62 rotate in opposite directions through the connecting rod 64; a cylinder control switch 7 is also arranged on the side of the upper surface of the base 1; the cylinder control switch 7 is pneumatically connected to the pushing cylinder group 3 through a pipeline.

[0026] The base 1 is the basic support structure of the entire fixture. The fixture positioning plate 2 is installed in the middle of the base 1 to fix and position other components of the fixture. The base 1 provides a stable working platform. The fixture positioning plate 2 ensures the precise centering and fixation of the fixture components, improving the accuracy and reliability of the installation. The push cylinder group 3 is symmetrically arranged on both sides of the fixture positioning plate 2. The metal column is pressed into the plastic part by applying pressure through the telescopic movement of the push rod 31. The push cylinder group 3 provides uniform and controllable pressure to ensure that the metal column can be pressed into the plastic part smoothly and accurately, avoiding installation deviations caused by uneven pressure. The buffer plate 4 is located above the fixture positioning plate 2, and the card plate 5 is located above the buffer plate 4. The two are connected by an elastic component 8. The combined design of the buffer plate 4 and the card plate 5 can absorb and buffer the impact force during the pressing process, protect the plastic parts and metal columns from damage, and ensure the stability of the installation process. The self-centering clamping mechanism 6 is composed of a pressure rod structure 61 and a limit fixing structure 62. The clamping force can be adjusted and automatically centered by adjusting the bolt 63 and the connecting rod 64. The self-centering clamping mechanism 6 can automatically correct the coaxiality between the metal column and the plastic part to ensure the installation accuracy. At the same time, the clamping force can be accurately controlled by adjusting the bolt 63, which improves the stability and repeatability of the installation. The cylinder control switch 7 is pneumatically connected to the push cylinder group 3 through a pipeline to control the start and stop of the push cylinder group 3. The cylinder control switch 7 provides a convenient operation method, allowing the operator to quickly and accurately control the action of the push cylinder group 3, thereby improving work efficiency.

[0027] Preferably, a pushing rod 31 is provided in the middle of the pushing cylinder group 3; the pushing rod 31 is telescopically movable in the pushing cylinder group 3; a clamping groove 51 is symmetrically provided on the clamping plate 5; the pushing rod 31 is tangent to the upper surface of the clamping plate 5; the pushing rod 31 and the center of the clamping groove 51 are arranged correspondingly.

[0028] The push rod 31 is arranged corresponding to the center of the engaging groove 51 of the clamping plate 5 and matches the guiding inclined surface 52 of the engaging groove 51 ; the design of the push rod 31 and the engaging groove 51 ensures the concentration and uniform distribution of the driving force.

[0029] Preferably, the fixture positioning plate 2 and the base 1 , the fixture positioning plate 2 and the buffer plate 4 , and the buffer plate 4 and the clamping plate 5 are fixedly connected by a detachable bolt structure.

[0030] The use of a removable bolt structure means that various components, such as the fixture positioning plate, base, buffer plate, and card plate, can be easily removed and replaced. If a component is damaged or needs regular inspection, the user can quickly remove it and repair or replace it without affecting other components. The removable bolt structure allows the installation position of various components to be adjusted in different working environments. For example, if you need to change the positioning method of the fixture or adjust the pressure of the buffer plate, just loosen the bolts and readjust the position to adapt to different work needs. Bolted structures can usually reduce overall production costs. Bolted structures are generally cheaper to manufacture and can avoid the use of more complex and expensive connection methods such as welding. At the same time, bolted connections can also reduce the cost of subsequent maintenance because maintenance personnel can disassemble, repair or replace parts with simple tools.

[0031] Preferably, each group of the pushing cylinder group 3 is provided with a first fixing seat 32 and a second fixing seat 33; an L-shaped connecting plate 34 is provided at the connection between the first fixing seat 32 and the second fixing seat 33 and the base 1; and a rectangular baffle 35 is also provided on the first fixing seat 32.

[0032] By using the first fixing seat 32 and the second fixing seat 33, the stable fixing of the push cylinder group 3 can be ensured. The design of the two fixing seats can effectively disperse the load, enhance the stability of the push cylinder group, and avoid loosening or deformation during operation.

[0033] The design of the L-shaped connecting plate 34 further enhances the connection strength between the fixing seat and the base 1. Compared with the flat plate structure, the L-shaped plate structure can provide higher anti-torsion and anti-lateral force capabilities, especially when it is necessary to withstand a large torque, it can ensure the stability of the connection.

[0034] The L-shaped connecting plate 34 is connected to the base so that the overall structure has a certain adjustment space. The L-shaped connecting plate can make the installation more flexible and can adapt to different installation requirements, so as to facilitate the adjustment of the position and angle of the push cylinder group as needed. In the design of the push cylinder group, the precise control of the position and angle is very important. Through the design of the rectangular baffle 35, the range of movement of the push cylinder group can be effectively controlled or the movement trajectory of the cylinder can be limited. The setting of this baffle helps to ensure the accuracy of the cylinder action and prevent the cylinder from malfunctioning during operation.

[0035] Preferably, at least two groups of elastic components 8 are provided between the buffer plate 4 and the card plate 5, and the elastic components 8 include symmetrically distributed compression springs 81 and guide columns 82; the guide columns 82 penetrate the buffer plate 4 and extend to the interior of the card plate 5, and a limit block 83 is provided at the end for limiting the buffer stroke and ensuring elastic reset in the vertical direction.

[0036] The elastic component 8 includes a compression spring 81 and a guide column 82, which are used to provide elastic support between the buffer plate 4 and the clamping plate 5; the elastic component 8 can provide buffering and reset functions during the pressing process, ensuring the stability and reliability of the installation process, while extending the service life of the clamp; the limit block 83 is used to limit the buffer stroke and ensure elastic reset in the vertical direction; the limit block 83 can prevent excessive compression or deviation, ensure that the elastic element works within a predetermined range, and avoid excessive deformation of the structure Preferably, the inner wall of the engaging groove 51 is provided with a guiding inclined surface 52, and the inclination angle of the guiding inclined surface 52 is 15°-30°.

[0037] In the process of pressing the metal column into the plastic part, the guide bevel 52 can guide the metal column into the correct position. Due to a certain inclination angle, when the metal column contacts the guide bevel 52, it will be subjected to a component force along the bevel downward, which helps the metal column to automatically correct its position and ensure its alignment with the plastic part, thereby improving the accuracy and coaxiality of the installation; the design of the guide bevel 52 can also reduce the resistance of the metal column during the pressing process. Compared with a vertical wall, the bevel can provide a smoother transition, allowing the metal column to slide into the plastic part more easily, avoiding additional resistance and possible damage caused by hard collision.

[0038] Preferably, the end of the adjusting bolt 63 is provided with a precision thread 631 and a scale mark 632; a threaded hole 621 is correspondingly provided on the limiting fixing structure 62; the clamping force of the pressure rod structure 61 can be fine-tuned by rotating the adjusting bolt 63, and the scale mark 632 is used to quantify the adjustment amount and realize traceable control of the clamping force.

[0039] By rotating the adjustment bolt 63, the clamping force of the pressure rod structure 61 on the workpiece can be finely adjusted. This fine-tuning capability allows the fixture to adapt to workpieces of different sizes, materials or shapes, ensuring that the clamping is both stable and will not damage the workpiece; the setting of the scale mark 632 allows the adjustment amount to be quantified. The operator can intuitively see how many turns or grids the adjustment bolt 63 has rotated, thereby accurately controlling the size of the clamping force. This helps to improve the accuracy and consistency of installation.

[0040] Preferably, an elastic element 65 is further provided between the pressure rod structure 61 and the limit fixing structure 62; the elastic element 65 is a coil spring or a disc spring, and its two ends are respectively fixed to the hinge point of the pressure rod structure 61 and below the adjustment bolt 63.

[0041] The elastic element 65 provides appropriate elastic force for the pressure rod structure to reduce excessive clamping pressure; the elastic element 65 ensures that the clamping force is not too large, avoids excessive pressure on the metal column or plastic parts, and ensures the assembly quality.

[0042] Specific implementation: Before using the fixture to perform interference fit installation of metal columns and plastic parts, a series of preparations must be performed first. This includes ensuring the integrity of all components and checking whether parts such as bolts, springs, and push cylinders are installed in place and function properly. At the same time, the work area needs to be cleaned to ensure that there is no debris interfering with the assembly process. Next, adjust the positioning plate and card plate of the fixture according to the size of the metal column and plastic part to be assembled. By removing and reinstalling the bolt structure, the adaptation range of the fixture can be easily adjusted to meet the assembly requirements of parts of different specifications; place the metal column to be assembled on the positioning plate of the fixture to ensure that it is aligned with the center line of the fixture. At this time, the metal column should be stably placed in the fixture for subsequent press-in operation; then, place the plastic part on the metal column and prepare for press-in assembly. When placing the plastic part, it is necessary to ensure that its embedded surface is in close contact with the top surface of the metal column to form the basis for interference fit; before formal press-in, the clamping force of the fixture needs to be adjusted according to actual needs. The clamping force of the pressure rod structure can be fine-tuned by rotating the adjustment bolt on the limit fixing structure. The precise threads and scale markings of the adjustment bolt make the clamping force adjustment process both accurate and traceable. Users can set the appropriate clamping force according to the material, size and required assembly tightness of the metal column and plastic part; after adjusting the clamping force, the press-in operation can be started. Start the cylinder control switch and push the cylinder group to push the push rod to telescopic movement by pneumatic means. Under the push of the cylinder, the push rod moves accurately along the clamping groove on the card plate to stably press the metal column into the plastic part; during the press-in process, the self-centering clamping mechanism plays a key role. The pressure rod structure and the limit fixing structure rotate in the opposite direction through the connecting rod to automatically adjust the coaxiality of the metal column and the plastic part. This function ensures the accurate alignment of the metal column and the plastic part during the assembly process, avoiding assembly errors caused by poor alignment; during the press-in operation, the elastic component between the buffer plate and the card plate plays a key buffering role. The cooperation of the compression spring and the guide column effectively absorbs the impact force during the assembly process, avoiding excessive force from causing damage to the metal column and plastic parts. The limit block of the guide column limits the buffer stroke and ensures elastic reset in the vertical direction during assembly. This design not only improves the assembly accuracy, but also further ensures the safety of operation; when the push rod is fully extended and pushes the metal column to be fully pressed into the plastic part, turn off the cylinder control switch. At this time, the clamping force of the fixture remains constant, ensuring that the interference fit between the metal column and the plastic part is stable and reliable; next, check the assembled parts. Confirm that the metal column and the plastic part fit tightly without gaps and that the assembly position is accurate. If necessary, further verification can be performed using measuring tools; after completing the assembly task, the fixture needs to be disassembled and cleaned. By disassembling the bolt structure, the components can be easily separated for subsequent cleaning and maintenance work. At the same time, worn or damaged parts are replaced in a timely manner to ensure the long-term and stable operation of the fixture.

[0043] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A metal column is pressed into a plastic part to form an interference fit installation fixture, characterized in that: The invention comprises a base (1), a fixture positioning plate (2) installed in the middle of the base (1), and a pushing cylinder group (3) symmetrically arranged along the positioning plate (2); a buffer plate (4) and a clamping plate (5) are arranged in sequence above the fixture positioning plate (2); a self-centering clamping mechanism (6) is also arranged at the upper edge of the clamping plate (5); the self-centering clamping mechanism (6) is composed of a pressure rod structure (61) and a limit fixing structure (62); an adjusting bolt (63) is arranged on the limit fixing structure (62); a connecting rod (64) is arranged between the pressure rod structure (61) and the limit fixing structure (62); the pressure rod structure (61) and the limit fixing structure (62) rotate in opposite directions through the connecting rod (64); a cylinder control switch (7) is also arranged on the side of the upper surface of the base (1); the cylinder control switch (7) is pneumatically connected to the pushing cylinder group (3) through a pipeline.

2. The metal column press-fit plastic part interference fit installation fixture as claimed in claim 1, characterized in that: A push rod (31) is provided in the middle of the push cylinder group (3); the push rod (31) is telescopically movable in the push cylinder group (3); the clamping plate (5) is symmetrically provided with clamping grooves (51); the push rod (31) is tangent to the upper surface of the clamping plate (5); the push rod (31) and the center of the clamping groove (51) are arranged correspondingly.

3. The metal column press-fit plastic part interference fit installation fixture as claimed in claim 1, characterized in that: The fixture positioning plate (2) and the base (1), the fixture positioning plate (2) and the buffer plate (4), and the buffer plate and the clamping plate (5) are all fixedly connected by a detachable bolt structure.

4. The metal column press-fit plastic part installation fixture as claimed in claim 1, characterized in that: Each group of the pushing cylinder group (3) is provided with a first fixing seat (32) and a second fixing seat (33); an L-shaped connecting plate (34) is provided at the connection between the first fixing seat (32) and the second fixing seat (33) and the base (1); and a rectangular baffle (35) is also provided on the first fixing seat (32).

5. The metal column press-fit plastic part interference fit installation fixture as claimed in claim 1, characterized in that: At least two groups of elastic components (8) are provided between the buffer plate (4) and the clamping plate (5); the elastic components (8) include symmetrically distributed compression springs (81) and guide columns (82); the guide columns (82) penetrate the buffer plate (4) and extend into the interior of the clamping plate (5), and are provided with a limit block (83) at the end thereof for limiting the buffer stroke and ensuring elastic reset in the vertical direction.

6. The metal column press-fit plastic part interference fit installation fixture as claimed in claim 2, characterized in that: The inner wall of the clamping groove (51) is provided with a guiding inclined surface (52), and the inclination angle of the guiding inclined surface (52) is 15°-30°.

7. The metal column press-fit plastic part interference fit installation fixture as claimed in claim 1, characterized in that: The end of the adjusting bolt (63) is provided with a precision thread (631) and a scale mark (632); the position-limiting fixing structure (62) is correspondingly provided with a threaded hole (621); and the clamping force of the pressure rod structure (61) can be fine-tuned by rotating the adjusting bolt (63).

8. The metal column press-fit plastic part interference fit installation fixture as claimed in claim 1, characterized in that: An elastic element (65) is also provided between the pressure rod structure (61) and the position-limiting fixing structure (62); the elastic element (65) is a coil spring or a disc spring, and its two ends are respectively fixed to the hinge point of the pressure rod structure (61) and below the adjustment bolt (63).

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