A clearance compensation device and method for the drive shaft connection of a metering pump

Abstract

This invention discloses a clearance compensation device and method for the connection of a metering pump drive shaft, relating to the field of mechanical transmission connection structure technology. The invention includes a drive shaft, a pin fixed to one end of the drive shaft, and a metering pump drive unit. The end of the metering pump drive unit has a drive shaft groove for accommodating the pin. A compensation mechanism for eliminating the clearance between the pin and the drive shaft groove is fixed on the pin. The compensation mechanism can be a precision adjustment mechanism integrating mechanical and floating compensation, or a simple integrated or separate shim compensation component. This invention, by measuring the clearance, machining or adjusting the compensation component, and fixing it to the pin, achieves a clearance-free fit between the pin and the drive shaft groove. This effectively solves the transmission clearance problem caused by component size mismatch, restores rigid connection, eliminates vibration and uneven wear, and has the advantages of low cost, quick implementation, strong adaptability, and stable and reliable operation.

Description

Technical Field

[0001] This invention belongs to the field of mechanical transmission connection structure technology, and in particular relates to a clearance compensation device and method for the connection of a metering pump drive shaft. Background Technology

[0002] In industrial fields such as chemical fiber spinning, metering pumps are key actuators for precisely controlling the fluid output, and their operational stability directly determines product quality. Metering pumps are typically driven by an independent drive shaft. The drive shaft and the metering pump drive unit often use a "shaft-groove" connection structure for power transmission, that is, the pin at the end of the drive shaft is directly inserted into the drive shaft groove of the metering pump drive unit, and the stable transmission of torque is achieved through the tight fit between the two.

[0003] In actual production applications or equipment upgrades, metering pumps or drive shafts are often replaced due to equipment upgrades (such as switching from multi-head spinning to multi-head spinning). At this time, the dimensional mismatch between the old and new components becomes apparent: the width of the newly replaced drive shaft groove is often larger than the design width of the original drive shaft pin, or due to wear after long-term operation, an unexpected clearance appears between the pin and the groove. This clearance creates radial play in the transmission system, which should be rigidly connected. When the equipment is running, the pin misaligns and runs radially within the groove, generating abnormal vibration and noise, and exacerbating uneven wear on the contact surface between the pin and the groove, creating a vicious cycle and severely shortening the component's lifespan. More importantly, this unstable power transmission directly causes fluctuations in the metering pump's rotational speed, affecting the uniformity of the spinning melt output, ultimately resulting in uneven filament fineness and a large number of downgraded products.

[0004] To address the gap issues caused by dimensional mismatch or wear, the conventional solution is to customize non-standard sized drive shaft pins or directly replace the entire drive shaft and metering pump assembly. However, this approach is not only costly to modify and time-consuming in procuring spare parts, but also lacks versatility, making it difficult to meet the urgent need for a quick and economical solution to the gap problem on-site. Therefore, how to quickly and effectively eliminate drive shaft connection gaps and restore the rigid connection of the system without replacing major components has become a pressing technical problem in this field. Summary of the Invention

[0005] The purpose of this invention is to provide a clearance compensation device and method for the connection of a metering pump drive shaft. By setting a compensation mechanism on the drive shaft pin, the clearance between the drive shaft pin and the drive shaft groove is eliminated in an active or passive manner, thus solving the problems of transmission clearance, operating vibration and unstable power transmission caused by component size mismatch in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention provides a clearance compensation device for the connection of a metering pump drive shaft, comprising a drive shaft, a pin, a compensation mechanism, and a metering pump drive unit. The pin is fixed to one end of the drive shaft, and a drive shaft groove is provided at the end of the metering pump drive unit. The shape of the drive shaft groove matches the outer contour of the pin. The pin is inserted into the drive shaft groove at the end of the metering pump drive unit to realize power transmission. A compensation mechanism is fixed on the pin and is located in the fit clearance between the pin and the drive shaft groove to eliminate the fit clearance between the pin and the drive shaft groove.

[0007] Furthermore, the shaft pin has an internal mounting groove, and both sides of the mounting groove have rail grooves that connect to the outside. The mounting groove has a threaded connection hole on the other side that is perpendicular to the rail groove. A set of symmetrically arranged guide rods are fixed inside the mounting groove.

[0008] Furthermore, the compensation mechanism includes a mechanical compensation mechanism, a floating compensation mechanism, and a compensation seat. Floating compensation mechanisms are fixed on both sides of the mechanical compensation mechanism, and compensation seats are fixed on the outer sides of both floating compensation mechanisms.

[0009] Furthermore, the floating compensation mechanism includes an outer mounting plate, an inner mounting plate, and a spring assembly. A spring assembly is fixed between the outer mounting plate and the inner mounting plate, and the spring assembly is a set of evenly distributed springs. The inner side of the compensation seat is provided with a connecting groove that matches the size of the floating compensation mechanism, and each corner of the outer mounting plate is provided with a mounting hole that matches the reserved hole at each corner of the connecting groove. A set of symmetrically arranged connecting rods are fixed on the top and bottom edges of the inner side of the outer mounting plate, and through holes are provided on the top and bottom edges of the inner mounting plate for the connecting rods to move through. The two sides of the axle pin are provided with slots to accommodate the connecting rods on both sides.

[0010] Furthermore, the mechanical compensation mechanism includes a main drive assembly and a transmission assembly, with the transmission assembly connected to both sides of the main drive assembly.

[0011] Furthermore, the main drive assembly includes a manual threaded drive rod and a drive plate. The drive plate is movably connected to a set of guide rods. The manual threaded drive rod is threaded into a threaded connection hole and its inner end is movably connected to the drive plate via a bearing. The transmission assembly includes a movable connecting plate, a gear seat, and a gear rail. One end of the movable connecting plate is movably connected to one end of the drive plate via a movable shaft, and the other end of the movable connecting plate is movably connected to the outer end of the gear seat via another movable shaft. A shaft is movably connected to the center hole of the gear seat, and the shaft is fixed in the mounting groove. A gear rail is slidably connected inside the rail groove, and the gear rail meshes with the gear seat on the corresponding side. The outer end of the gear rail is connected to the inner mounting plate of the floating compensation mechanism on the corresponding side.

[0012] Furthermore, the compensation mechanism includes a shim compensation component, which is fixed on both sides of the shaft pin in the width direction. The thickness of the shim compensation component is the same as the single-sided fitting clearance value between the shaft pin and the drive shaft groove.

[0013] Furthermore, the gasket compensation component is an integral structure, which is an arc-shaped sheet structure that fits the outer circumferential surface of the shaft pin, and the radius of curvature of its inner arc surface is the same as the radius of curvature of the outer circumference of the shaft pin.

[0014] Furthermore, the gasket compensation component has a split structure, consisting of a set of stacked thin plates. The number of stacked thin plates can be adjusted to accommodate different sizes of mating clearances. The split-type gasket compensation component has elongated holes and is connected to the shaft pin by bolts to achieve fine adjustment of the compensation thickness.

[0015] The present invention also provides a clearance compensation method for the connection of a metering pump drive shaft. The method uses the clearance compensation device described above to eliminate the fit clearance between the drive shaft and the metering pump drive unit through the compensation mechanism, thereby achieving a clearance-free transmission connection.

[0016] The present invention has the following beneficial effects: 1. By setting up a compensation mechanism, this invention can effectively eliminate the fit clearance between the drive shaft pin and the drive shaft groove, transforming the original clearance fit into a clearance-free or interference fit, thereby restoring the rigid connection of the transmission system and completely eliminating radial wobble, abnormal vibration and uneven wear caused by the existence of clearance, significantly improving the stability and reliability of equipment operation.

[0017] 2. By combining a mechanical compensation mechanism with a floating compensation mechanism, this invention can not only actively and accurately fill the initial gap through manual adjustment, but also automatically adapt to minute gap changes caused by temperature changes, component wear, and other factors during long-term operation of the equipment, thus achieving dynamic adaptive compensation. This ensures that a gapless transmission state is always maintained without frequent manual intervention, greatly reducing maintenance costs.

[0018] 3. This invention provides a variety of compensation solutions, including precision adjustment mechanisms that integrate mechanical and floating compensation, as well as simple and low-cost integrated or split-type shim compensation components. Among them, the split-type shim compensation component can flexibly adapt to various gap values ​​by stacking thin sheets of different thicknesses and cooperating with elongated holes for fine adjustment. It has strong versatility and field adaptability, providing an economical and efficient solution for different application scenarios. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram showing the installation effect of the compensation mechanism in Example 2.

[0021] Figure 2 This is a schematic diagram of the gap before the modification.

[0022] Figure 3 for Figure 1 A schematic diagram of the compensation mechanism.

[0023] Figure 4 for Figure 3 A schematic diagram of the central shaft pin rail groove.

[0024] Figure 5 for Figure 3 A schematic diagram showing the changes in the movement of the compensation mechanism within the installation slot.

[0025] Figure 6 for Figure 5 A schematic diagram of the activity changes of the mechanical compensation mechanism.

[0026] Figure 7 This is a schematic diagram of the floating compensation mechanism installed inside the compensation seat.

[0027] Figure 8 This is a schematic diagram of the floating compensation mechanism.

[0028] Figure 9 This is a schematic diagram showing the installation effect after the compensation mechanism, which is modified by using a gasket compensation component with an integrated structure, is installed.

[0029] Figure 10 This is a schematic diagram showing the installation effect after the compensation mechanism, which is modified by using a split-structure gasket compensation component, is installed.

[0030] The attached diagram lists the components represented by each number as follows: 100. Drive shaft; 200. Shaft pin; 201. Mounting groove; 202. Rail groove; 203. Threaded connection hole; 204. Guide rod; 205. Slot; 300. Compensation mechanism; 310. Mechanical compensation mechanism; 311. Main drive assembly; 3111. Manual threaded drive rod; 3112. Drive plate; 312. Transmission assembly; 3121. Movable connecting plate; 3122. Gear seat; 3123. Gear rail; 320. Floating compensation mechanism; 321. Outer mounting plate; 3211. Connecting rod; 322. Inner mounting plate; 323. Spring assembly; 330. Compensation seat; 331. Connecting groove; 400. Metering pump drive unit; 500. Drive shaft groove; 501. Fit clearance. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1, please refer to Figure 1 , Figure 2 , Figure 7 , Figure 8 , Figure 9 and Figure 10 The present invention is a clearance compensation device for the connection of a metering pump drive shaft, comprising: a drive shaft 100; a pin 200 fixed to one end of the drive shaft 100; a metering pump drive unit 400, the end of which is provided with a drive shaft groove 500 for accommodating the pin 200; wherein, a compensation mechanism 300 is fixed on the pin 200 for eliminating the clearance 501 between the pin 200 and the drive shaft groove 500, and the clearance-free transmission connection is achieved by the compensation mechanism 300 filling the clearance 501 between the pin 200 and the drive shaft groove 500.

[0033] In this embodiment, the drive shaft 100 transmits power to the drive shaft groove 500 of the metering pump drive unit 400 via a shaft pin 200. Due to equipment modification or manufacturing tolerances, the width of the shaft pin 200 is usually smaller than the width of the drive shaft groove 500, resulting in a clearance 501 between them. This clearance causes the shaft pin 200 to wobble radially within the drive shaft groove 500, leading to problems such as vibration, uneven wear, and unstable power transmission. In this embodiment, a compensation mechanism 300 is fixed on the shaft pin 200, which occupies the space of the clearance 501, thereby eliminating the clearance between the shaft pin 200 and the drive shaft groove 500, achieving a tight fit, and restoring the rigid connection of the transmission system.

[0034] Example 2, please refer to Figure 1 , Figure 3 , Figure 4 , Figure 5 and Figure 6 Based on Example 1, this example provides a preferred compensation mechanism 300.

[0035] like Figure 4 and Figure 5 As shown, in this embodiment, the shaft pin 200 has an internal mounting groove 201, and both sides of the mounting groove 201 have external rail grooves 202. The mounting groove 201 has a threaded connection hole 203 on the other side that is perpendicular to the rail groove 202. A set of symmetrically arranged guide rods 204 are fixed inside the mounting groove 201.

[0036] like Figure 3 , Figure 5 and Figure 6 As shown, in this embodiment, the compensation mechanism 300 includes a mechanical compensation mechanism 310, a floating compensation mechanism 320, and a compensation seat 330. The floating compensation mechanism 320 is fixed on both sides of the mechanical compensation mechanism 310, and the compensation seat 330 is fixed on the outer side of the floating compensation mechanism 320 on both sides.

[0037] like Figure 7 and Figure 8 As shown, in this embodiment, the floating compensation mechanism 320 includes an outer mounting plate 321, an inner mounting plate 322, and a spring assembly 323. The spring assembly 323 is fixed between the outer mounting plate 321 and the inner mounting plate 322. The spring assembly 323 is a group of evenly distributed springs. The inner side of the compensation seat 330 is provided with a connecting groove 331 that matches the size of the floating compensation mechanism 320. Each corner of the outer mounting plate 321 is provided with a mounting hole that matches the pre-reserved hole at each corner of the connecting groove 331. The outer mounting plate 321 is fixed in the connecting groove 331 by bolts. The outer mounting plate 321 is fixed on the compensation seat 330 by bolts. The top and bottom edges of the inner side of the outer mounting plate 321 are each fixed with a set of symmetrically arranged connecting rods 3211. The top and bottom edges of the inner mounting plate 322 are each provided with through holes for the connecting rods 3211 to pass through. The connecting rods 3211 are inserted into the through holes, so that the inner mounting plate 322 can move axially relative to the outer mounting plate 321 under the guidance of the connecting rods 3211. Both sides of the shaft pin 200 are provided with slots 205 to accommodate the connecting rods 3211 on both sides. The connecting rods 3211 pass through the slots 205 and are connected to the inner mounting plate 322.

[0038] like Figure 5 , Figure 6As shown, in this embodiment, the mechanical compensation mechanism 310 includes a main drive assembly 311 and a transmission assembly 312, with the transmission assembly 312 connected to both sides of the main drive assembly 311. The main drive assembly 311 includes a manual threaded drive rod 3111 and a drive plate 3112. The drive plate 3112 is movably connected to a set of guide rods 204 and can slide along the axial direction of the guide rods 204. The manual threaded drive rod 3111 is threadedly connected to the threaded connection hole 203 and its inner end is movably connected to the drive plate 3112 through a bearing. The transmission assembly 312 includes a movable connecting plate 3121, a gear seat 3122, and a gear rail 3123. One end of the movable connecting plate 3121 is movably connected to one end of the drive plate 3112 via a movable shaft. The other end of the movable connecting plate 3121 is movably connected to the outer end of the gear seat 3122 via another movable shaft. A shaft is movably connected to the center hole of the gear seat 3122. The shaft is fixed in the mounting groove 201, and the gear seat 3122 can swing around the shaft. The gear rail 3123 is slidably connected inside the rail groove 202. The gear rail 3123 meshes with the gear seat 3122 on the corresponding side. The outer end of the gear rail 3123 is connected to the inner mounting plate 322 of the floating compensation mechanism 320 on the corresponding side.

[0039] The core of this embodiment lies in converting manual rotary motion into outward linear motion of the compensation seat 330 through a mechanical transmission mechanism, thereby actively filling the mating gap 501. The specific working process is as follows: When the operator needs to eliminate the mating clearance 501, first use a tool (such as a wrench) to rotate the manual thread drive rod 3111. When the manual thread drive rod 3111 rotates clockwise, it rotates into the mounting groove 201 relative to the threaded connection hole 203, pushing the drive plate 3112 to slide linearly into the mounting groove 201 along the guide rod 204. When the drive plate 3112 moves, the movable connecting plate 3121 pushes the gear seat 3122 to swing outward around its central axis. When the gear seat 3122 swings outward, it drives the gear rail 3123 that meshes with it to slide outward in a straight line within the rail groove 202. When the gear rail 3123 slides outward, it pushes the inner mounting plate 322 to move outward synchronously. The force of the inner mounting plate 322 moving outward is transmitted to the outer mounting plate 321 through the spring assembly 323, which in turn pushes the compensation seat 330 outward. Finally, the outer side of the compensation seat 330 abuts tightly against the side wall of the drive shaft groove 500, thereby eliminating the fitting clearance 501 between the shaft pin 200 and the drive shaft groove 500. During this process, the operator can precisely control the distance the compensation seat 330 pushes outward by controlling the number of rotations of the manual threaded drive rod 3111 according to the actual gap size, thereby achieving precise gap compensation.

[0040] Example 3: Based on the structure described in Example 2, this example further describes the adaptive adjustment function of the floating compensation mechanism 320 during operation.

[0041] Please see Figure 7 and Figure 8 The difference between this embodiment and embodiment 2 is that the spring assembly 323 in the floating compensation mechanism 320 plays a dynamic adjustment role during equipment operation.

[0042] Specifically, after the mechanical adjustment described in Example 2 is completed, the compensation seat 330 has basically filled the mating gap 501; However, during normal operation of the equipment, the drive shaft 100 drives the shaft pin 200 to rotate, and the compensation seat 330 keeps in contact with the side wall of the drive shaft groove 500. Due to factors such as temperature changes, component wear and mechanical vibration during equipment operation, the actual fit clearance 501 between the shaft pin 200 and the drive shaft groove 500 may change slightly. When the clearance 501 increases slightly due to component wear or temperature drop, the original pre-compression force of the spring assembly 323 is released. The elastic restoring force of the spring assembly 323 pushes the inner mounting plate 322 to move outward relative to the outer mounting plate 321. Since the inner mounting plate 322 is fixedly connected to the gear rail 3123, and the outer mounting plate 321 is guided to the inner mounting plate 322 through the connecting rod 3211, when the inner mounting plate 322 moves outward, the thrust is transmitted to the outer mounting plate 321 through the spring assembly 323, which in turn pushes the compensation seat 330 to move slightly outward, so that the compensation seat 330 always maintains close contact with the side wall of the drive shaft groove 500, filling the increased clearance. When the clearance 501 decreases due to thermal expansion, the compensating seat 330 is subjected to increased reverse extrusion force from the side wall of the drive shaft groove 500. This reverse pressure is transmitted to the outer mounting plate 321 through the compensating seat 330, thereby compressing the spring assembly 323. The spring assembly 323 is further compressed, causing the inner mounting plate 322 to move slightly inward relative to the outer mounting plate 321, and the compensating seat 330 to shrink slightly inward accordingly, thus avoiding component jamming or excessive wear caused by excessive extrusion force. Through the above process, the spring assembly 323 plays a dual role of elastic buffering and automatic adjustment, ensuring that the compensation seat 330 always maintains contact with the side wall of the transmission shaft groove 500 with appropriate pressure. This floating compensation mechanism ensures that even if there are slight gap changes during long-term operation, the equipment can automatically maintain a gapless transmission connection without the need for repeated manual adjustments.

[0043] Example 4: This example provides a structure that uses an integrated gasket compensation component to achieve gap compensation. Please refer to [link / reference]. Figure 9The compensation mechanism 300 includes a shim compensation component, which is fixed on both sides of the shaft pin 200 in the width direction. The thickness of the shim compensation component is the same as the single-sided fitting clearance 501 value between the shaft pin 200 and the transmission shaft groove 500.

[0044] like Figure 9 As shown, the gasket compensation component is an integral structure, which is an arc-shaped sheet structure adapted to the outer peripheral surface of the shaft pin 200. The radius of curvature of its inner arc surface is the same as the radius of curvature of the outer circumference of the shaft pin 200 to ensure that it can fit tightly against the surface of the shaft pin 200. The integral gasket compensation component is fixed to both sides of the shaft pin 200 by welding or bonding.

[0045] The core of this embodiment lies in expanding the effective working width of the shaft pin 200 to match the actual width of the drive shaft groove 500 by adding an integrated arc-shaped shim compensation component that fits the curved surface of the shaft pin 200. The specific working process is as follows: First, perform clearance measurement: Use measuring tools (such as vernier calipers) to accurately measure the actual width W_new of the drive shaft groove 500 and the actual width W_old of the shaft pin 200; to ensure measurement accuracy, measurements should be taken at multiple cross-sectional positions of the shaft pin 200 and the drive shaft groove 500, and the average value should be taken as the final measurement value; calculate the single-sided fit clearance value δ = (W_new - W_old) / 2 based on the measurement results; Then, based on the measurement results, an integrated gasket compensation component is manufactured: the gasket compensation component is an arc-shaped sheet structure with a thickness equal to δ, and its inner arc surface curvature radius is exactly the same as the outer circumferential curvature radius of the shaft pin 200; during processing, wire cutting or precision milling processes can be used to ensure accurate thickness dimensions and a smooth, burr-free inner arc surface; the material of the gasket compensation component can be the same metal material as the shaft pin 200 (such as 45# steel or stainless steel) to avoid electrochemical corrosion. Next, the assembly and fixing process is performed: two integrated gasket compensation pieces are respectively attached to both sides of the shaft pin 200 in the width direction, so that the shaft pin 200 is located between the two gasket compensation pieces, ensuring that the inner arc surface of the gasket compensation piece is tightly fitted with the outer circumferential surface of the shaft pin 200, with no obvious gaps at the contact surface; then, it is fixed to the shaft pin 200 by welding: welding points are evenly distributed along the edge of the gasket compensation piece, and spot welding is used to avoid local overheating deformation caused by continuous welds; high-strength metal adhesives (such as epoxy resin metal glue) can also be used for bonding and fixing. Before bonding, the contact surfaces need to be cleaned and roughened to improve the bonding strength; After fixing, the shaft pin 200 and the integrated gaskets on both sides together form a composite shaft pin with a total width of W_old + 2δ = W_new, which is equal to the actual width of the transmission shaft groove 500. When the composite shaft pin is installed into the transmission shaft groove 500, the two form a transition fit or interference fit, and the original fit clearance 501 is completely eliminated, achieving a tight fit. During transmission, the integrated shim compensation component directly bears the compressive force from the side wall of the transmission shaft groove 500, and together with the shaft pin 200, it transmits torque, ensuring the stability and reliability of power transmission.

[0046] Example 5: This example provides another structure for gap compensation using a split-type shim compensation component. Please refer to [link / reference]. Figure 10 The compensation mechanism 300 includes a shim compensation component, which is fixed on both sides of the shaft pin 200 in the width direction. The thickness of the shim compensation component is the same as the single-sided fitting clearance 501 value between the shaft pin 200 and the transmission shaft groove 500.

[0047] like Figure 10 As shown, the gasket compensation component is a split structure, consisting of a set of stacked thin sheets. The number of stacked thin sheets can be adjusted to accommodate different sizes of fitting gaps 501. The split gasket compensation component has elongated holes and is connected to the shaft pin 200 by bolts. The elongated holes allow for fine-tuning of the position of the compensation component during installation to achieve precise adjustment of the compensation thickness.

[0048] The core of this embodiment lies in constructing a split-type gasket compensation component using stackable thin sheet groups, thereby achieving flexible adjustment of the compensation thickness to adapt to different sizes of fitting clearances. The specific working process is as follows: First, perform clearance measurement. Use measuring tools (such as vernier calipers) to accurately measure the actual width W_new of the drive shaft groove 500 and the actual width W_old of the shaft pin 200, and calculate the single-sided fit clearance value δ = (W_new - W_old) / 2. Then, based on the measurement results, thin sheets are selected for stacking: the split-type gasket compensation component consists of a set of thin sheets of different thicknesses, such as 0.2mm, 0.5mm, 1mm, and 2mm. The operator selects several thin sheets to stack based on the calculated δ value, ensuring the total stacked thickness equals δ. For example, if δ = 4.5mm, three thin sheets of 2mm + 2mm + 0.5mm can be stacked, or four thin sheets of 2mm + 1mm + 1mm + 0.5mm can be stacked. This combination method allows a single set of thin sheets to adapt to various gap sizes, providing strong versatility. The thin plates are arc-shaped to fit the outer circumference of the pin 200, with the inner arc radius of curvature being the same as the outer circumference radius of curvature of the pin 200, ensuring that each thin plate can fit tightly against the surface of the pin 200. Each thin plate has an elongated hole extending along the width of the thin plate, with a length greater than the bolt diameter, to allow for fine-tuning of its position during installation. Next, assemble and fix the sheet assembly: Align the stacked sheet groups so that the elongated holes of each sheet correspond to each other, and then attach the sheet groups to both sides of the shaft pin 200 in the width direction; pass the bolts through the elongated holes of the sheet groups and screw them into the pre-set threaded holes on the shaft pin 200; before tightening the bolts, the position of the sheet groups can be finely adjusted along the direction of the elongated holes to ensure that their contact position with the shaft pin 200 is optimal, so that the inner arc surface of the sheet groups is completely in contact with the outer circumference surface of the shaft pin 200; after the position is adjusted to the correct position, tighten the bolts to fix the sheet groups to the shaft pin 200; for thicker compensation requirements, multiple bolts can be used for distributed fixing to improve the reliability of the fixing; After fixing, the shaft pin 200 and the two separate shim compensation parts on both sides together form a composite shaft pin, the total width of which is equal to the actual width of the transmission shaft groove 500, and the original fit clearance 501 is completely eliminated. The advantages of this split structure are: firstly, it is highly adaptable, as it can adapt to various gap sizes through different combinations of thin plates; secondly, it is highly adjustable, with the elongated hole design allowing for fine-tuning of the installation position; and thirdly, it is easy to maintain, as the thin plates can be replaced individually when the shim compensation parts are worn, without the need for overall replacement. During transmission, the split shim compensation parts directly bear the extrusion force from the side wall of the transmission shaft groove 500, and together with the shaft pin 200, they transmit torque, ensuring the stability and reliability of power transmission.

[0049] Example 6: This example provides a clearance compensation method for the connection of a metering pump drive shaft. It employs a clearance compensation device as described in Example 2 or Example 3, and eliminates the clearance 501 between the drive shaft 100 and the metering pump drive unit 400 through a mechanical compensation mechanism 310, thereby achieving a clearance-free transmission connection. The method includes the following steps: S1. Measuring clearance: Measure the fit clearance 501 between the shaft pin 200 and the drive shaft groove 500 to determine the amount of clearance that needs to be compensated; S2. Active adjustment: Rotate the manual threaded drive rod 3111, which, through the transmission of the movable connecting plate 3121, the gear seat 3122, and the gear rail 3123, pushes the compensation seat 330 outward until the compensation seat 330 is in close contact with the side wall of the transmission shaft groove 500; continue to rotate the manual threaded drive rod 3111 until the spring assembly 323 generates an appropriate pre-compression amount and then stops. S3. Adaptive Compensation: During equipment operation, when the fit clearance changes slightly due to temperature changes or wear, the spring assembly 323 automatically extends and retracts, pushing the compensation seat 330 to move slightly outward or retract slightly inward, so that the compensation seat 330 always maintains close contact with the side wall of the transmission shaft groove 500, realizing dynamic adaptive compensation. S4. Operational Verification: Start the equipment operation test, and fine-tune the manual threaded drive rod 3111 according to the operation status until the optimal zero-clearance fit is achieved.

[0050] This method actively adjusts and precisely fills the initial fit gap, and uses the elasticity of the spring assembly 323 to achieve adaptive replenishment during operation. The combination of the two ensures long-term stable backlash-free transmission. This method has high adjustment accuracy and can self-lock after adjustment, and is suitable for occasions where the gap value is uncertain or where precise control of the fit tightness is required.

[0051] Example 7: This example provides a clearance compensation method for the connection of a metering pump drive shaft. It employs the clearance compensation device described in Example 4, that is, the mating clearance 501 is eliminated by an integrated shim compensation component. The method includes the following steps: Measuring clearance: Accurately measure the actual width of the drive shaft groove 500 and the actual width of the shaft pin 200, and calculate the single-sided fit clearance value δ; Machining an integrated gasket compensation component: Machining an integrated arc-shaped sheet gasket compensation component according to δ, the thickness of which is equal to δ, and the radius of curvature of the inner arc surface is the same as the radius of curvature of the outer circumference of the shaft pin 200; S3. Assembly and fixing: The two integrated shim compensation parts are respectively attached to both sides of the shaft pin in the width direction of 200, and fixed by spot welding or bonding. S4. Installation Verification: Install the assembled composite shaft pin into the drive shaft groove 500, check the tightness of the assembly, and confirm that there is no abnormal vibration or noise.

[0052] This method uses an integrated arc-shaped gasket compensation component, which has the characteristics of good integrity, high strength, and is not easy to loosen after installation. Through precise machining, the thickness of the compensation component is made equal to the clearance value on one side. After fixing, it forms a composite shaft pin that fits tightly with the drive shaft groove, realizing a backlash-free transmission connection.

[0053] Example 8: This example provides a clearance compensation method for the connection of a metering pump drive shaft. It employs the clearance compensation device described in Example 5, that is, it eliminates the mating clearance 501 using a split-type shim compensation component. The method includes the following steps: Measuring clearance: Accurately measure the actual width of the drive shaft groove 500 and the actual width of the shaft pin 200, and calculate the single-sided fit clearance value δ; Select thin sheets for stacking: Select several thin sheets from a group of thin sheets of different thicknesses and stack them together so that the total stacked thickness is equal to δ. Each thin sheet is an arc-shaped sheet that fits the outer peripheral surface of the shaft pin 200 and has an elongated hole. S3. Assembly and fixing: The stacked sheet groups are respectively attached to both sides of the shaft pin 200 in the width direction. They are connected to the shaft pin 200 by bolts passing through the elongated holes. Before tightening the bolts, the position of the sheet groups is slightly adjusted along the direction of the elongated holes to ensure the best fit before tightening and fixing. S4. Installation Verification: Install the assembled composite shaft pin into the drive shaft groove 500, check the tightness of the assembly. If there is a gap, add a thin plate; if it is too tight, remove a thin plate until the fit is tight. Confirm that there is no abnormal vibration or noise.

[0054] This method uses stackable thin sheet groups to form a split-type gasket compensation component, which has the characteristics of strong adaptability (adapting to various gap sizes through different combinations of thin sheets), good adjustability (the position of the long hole can be finely adjusted, and the number of thin sheets can be increased or decreased at any time), and convenient maintenance (wearing thin sheets can be replaced individually). It is particularly suitable for occasions where the gap value is uncertain or requires on-site adjustment.

[0055] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A clearance compensation device for the drive shaft connection of a metering pump, characterized in that, The device includes a drive shaft (100), a pin (200), a compensation mechanism (300), and a metering pump drive unit (400). The pin (200) is fixed to one end of the drive shaft (100). The end of the metering pump drive unit (400) has a drive shaft groove (500). The shape of the drive shaft groove (500) matches the outer contour of the pin (200). The pin (200) is inserted into the drive shaft groove (500) at the end of the metering pump drive unit (400) to achieve power transmission. The compensation mechanism (300) is fixed on the pin (200). The compensation mechanism (300) is located in the fit clearance (501) between the pin (200) and the drive shaft groove (500) to eliminate the fit clearance (501) between the pin (200) and the drive shaft groove (500). The compensation mechanism (300) includes a mechanical compensation mechanism (310) and a floating compensation mechanism (320), with floating compensation mechanisms (320) fixed on both sides of the mechanical compensation mechanism (310). The floating compensation mechanism (320) includes an outer mounting plate (321), an inner mounting plate (322), and a spring assembly (323). The spring assembly (323) is fixed between the outer mounting plate (321) and the inner mounting plate (322). The spring assembly (323) is a set of evenly distributed springs. The mechanical compensation mechanism (310) includes a main drive assembly (311) and a transmission assembly (312), with the transmission assembly (312) connected to both sides of the main drive assembly (311). The main drive assembly (311) includes a manual threaded drive rod (3111) and a drive plate (3112). The drive plate (3112) is movably connected to a set of guide rods (204). The manual threaded drive rod (3111) is threaded in a threaded connection hole (203) and its inner end is movably connected to the drive plate (3112) through a bearing. The transmission assembly (312) includes a movable connecting plate (3121), a gear seat (3122), and a gear rail (3123). One end of the movable connecting plate (3121) is movably connected to one end of the drive plate (3112) via a movable shaft. The other end of the movable connecting plate (3121) is movably connected to the outer end of the gear seat (3122) via another movable shaft. The gear rail (3123) meshes with the gear seat (3122) on the corresponding side. The outer end of the gear rail (3123) is connected to the inner mounting plate (322) of the floating compensation mechanism (320) on the corresponding side.

2. The clearance compensation device for the connection of the drive shaft of a metering pump according to claim 1, characterized in that, The shaft pin (200) has an internal mounting groove (201), and both sides of the mounting groove (201) have rail grooves (202) that connect to the outside. The mounting groove (201) has a threaded connection hole (203) on the other side that is perpendicular to the rail groove (202). A set of symmetrically arranged guide rods (204) are fixed inside the mounting groove (201).

3. A clearance compensation device for the connection of a metering pump drive shaft according to claim 2, characterized in that, The compensation mechanism (300) also includes a compensation seat (330), and the outer sides of the floating compensation mechanisms (320) on both sides are fixed with compensation seats (330).

4. A clearance compensation device for the connection of a metering pump drive shaft according to claim 3, characterized in that, The inner side of the compensation seat (330) is provided with a connecting groove (331) that matches the size of the floating compensation mechanism (320), and each corner of the outer mounting plate (321) is provided with a mounting hole that matches the corner reserved hole of the connecting groove (331).

5. A clearance compensation device for the connection of a metering pump drive shaft according to claim 4, characterized in that, The top and bottom edges of the inner side of the outer mounting plate (321) are each fixed with a set of symmetrically arranged connecting rods (3211), and the top and bottom edges of the inner mounting plate (322) are each provided with through holes for the connecting rods (3211) to pass through.

6. A clearance compensation device for the connection of a metering pump drive shaft according to claim 5, characterized in that, The two sides of the shaft pin (200) are provided with slots (205) to accommodate the connecting rods (3211) on both sides. The center hole of the gear seat (3122) is movably connected to a shaft, which is fixed in the mounting groove (201). The inside of the rail groove (202) is slidably connected to a gear rail (3123).

7. A method for compensating for clearance in the drive shaft connection of a metering pump, characterized in that, By employing the gap compensation device as described in any one of claims 1-6, the fitting gap (501) between the drive shaft (100) and the metering pump drive unit (400) is eliminated by the compensation mechanism (300), thereby achieving a gapless transmission connection.

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