A lock screw machine for processing lock screw of compressor shell

Abstract

This invention relates to the field of screw fastening machine technology, specifically to a screw fastening machine for processing screws on compressor housings. It includes a support platform with multiple servo motors and a transmission mechanism mounted thereon. The transmission mechanism drives a locking component below it to rotate and fasten the screw. An adjustment platform has an adjustment groove and multiple clamping components on top of it. The clamping components hold a guide cylinder, within which the locking component rotates and slides up and down. A detection module is located below the guide cylinder to measure the height of the locking component. The locking component is equipped with bearings, supports, and ball bearings to ensure stability during axial rotation and vertical movement. This allows for precise measurement of the locking component's height, creating favorable conditions for selecting a screw fastening strategy based on the height data. It ensures a reasonable fastening sequence and uniform force distribution, preventing compressor housing deformation or screw / thread damage, and achieving high-precision, intelligent, and fully closed-loop controlled automatic screw fastening operation.

Description

Technical Field

[0001] This invention relates to the field of screw fastening machine technology, and specifically to a screw fastening machine for processing screws on compressor housings. Background Technology

[0002] In the assembly of precision mechanical equipment such as compressors, tightening screws on the compressor housing is a critical and frequent operation. Traditional manual screw tightening methods are not only inefficient but also prone to uneven tightening, screw tilting, stripping, or even damage to the screw holes due to improper operation, seriously affecting the assembly quality and reliability of the product. To improve production efficiency and assembly accuracy, automatic screw tightening machines are widely used in modern manufacturing.

[0003] With the development of automation technology, screw fastening machines have emerged, which can automatically tighten and lock screws through the cooperation of servo motors, screwdrivers, cylinders, and other components. However, existing automatic screw fastening machines still have some technical defects in practical applications. In particular, when feeding screws into the screw holes on the compressor housing, if the screw is not kept completely perpendicular to the axis of the screw hole during feeding or alignment, problems such as screw head misalignment and thread misalignment are very likely to occur. Once a tilted screw is forcibly screwed into the screw hole by the screw fastening machine, it will not only damage the thread structure, but may also cause local stress concentration in the compressor housing, thereby affecting the overall performance and service life of the machine, and even directly causing damage to the compressor housing.

[0004] Therefore, in order to improve the quality and yield of screw fastening, the screws of the compressor housing are pre-screwed during the screw fastening process. Generally, the screws are first manually inserted into the screw holes to initially fix the compressor housing and avoid the screws being crooked or the threads being misaligned. Then, the screws are conveyed to the screw fastening machine station through a conveying device, and the screw fastening machine completes the screw fastening by using a screwdriver.

[0005] After a long period of production and summarization, it was found that even with the above-mentioned manual pre-fixing of holes followed by locking by a wire-locking machine, at least the following problems still exist:

[0006] On the one hand, the manual operation process of pre-drilling holes is mainly to align the screws with the screw holes and perform preliminary fixing. However, due to the non-standardization of manual operation, the depth to which each screw is screwed in is inconsistent. Furthermore, the multiple screwdrivers of the existing screw-locking machine are driven synchronously by multiple servo motors, which can lead to inconsistent feed depths of different screws at the same time. This can easily cause uneven stress on the compressor housing, resulting in deformation and affecting product quality. Moreover, when tightening multiple screws simultaneously, it is necessary to tighten a portion of the diagonal screws first, and then tighten the remaining portion of the diagonal screws in batches to prevent uneven tightening caused by differences in screw torque, which may lead to compressor housing deformation or poor sealing.

[0007] Furthermore, the positions of the multiple screws and nuts that were manually pre-fixed were inconsistent (specifically, as shown in the example below). Figure 2 As shown in the top view of the compressor, the nuts of multiple screws on the compressor housing are in different positions (as indicated by the arrow). The corresponding sleeves at the ends of the locking components are also in different positions. When the locking component moves down and the sleeve presses against the screw nut, the screw nut may not be completely inserted into the sleeve. In this case, if the servo motor drives the locking component to rotate quickly, the sleeve will spin rapidly on the screw nut, which can easily cause wear on the screw nut and the sleeve, affecting the tightening effect of the screw by the subsequent screw locking machine.

[0008] In addition, during the locking process, the locking element rotates within the guide cylinder while simultaneously moving downwards along it. With prolonged and high-speed movement, this leads to severe wear on both the locking element and the guide cylinder, resulting in a widening gap between them. Furthermore, to meet the locking requirements of different products, the position of the locking element is often adjusted, causing the transmission rod to tilt (e.g., ...). Figure 5 As shown in the diagram (the positions of the transmission rod and locking component), when the transmission rod drives the locking component through the second universal joint, it will give the locking component an oblique thrust, causing the locking component to tilt inside the guide cylinder. The tilted locking component cannot lock with the corresponding screw, and cannot properly tighten the screw. Moreover, more seriously, if the tilted locking component directly contacts the compressor housing, it will damage the compressor housing when the locking component rotates rapidly, causing product damage.

[0009] Therefore, improvements to the wire locking machine are needed based on the aforementioned technical issues. Summary of the Invention

[0010] To solve the above-mentioned technical problems, a screw-locking machine for machining screws on compressor housings is proposed.

[0011] A screw-locking machine for processing screws on a compressor housing includes: a support platform on which multiple servo motors are mounted, each servo motor's output end passing through the support platform and connected to a transmission mechanism, the transmission mechanism driving a locking member below it to rotate and lock the screw; an adjustment platform with an adjustment groove on its upper part, multiple clamping members detachably mounted in the adjustment groove, the clamping members holding a guide cylinder, the locking member rotating and sliding up and down within the guide cylinder; a detection module below the guide cylinder for measuring the height of the locking member; before locking the screw, a control module controls the detection module to measure the initial height of each locking member and use it as a first dataset, controls all servo motors to simultaneously rotate at a first speed for a first preset time, after the first preset time, the detection module measures the height of each locking member and uses it as a second dataset, and the control module selects and executes a corresponding locking strategy based on the relationship between the second dataset and the first dataset to gradually lock the screw.

[0012] Preferably, the locking strategy includes a pre-tightening execution strategy, specifically: obtaining the specifications and models of the screws in the current batch, and obtaining the parameters of the screws in the current batch; calculating the theoretical feed value of the screws in the current batch rotating at a first speed and a first preset time; calculating the difference between the height values ​​of each locking component in the first dataset and the height values ​​of each corresponding locking component in the second dataset, and using this difference as the actual feed value, to obtain an actual feed value set; and determining the locking status of each locking component and the screw based on the relationship between each actual feed value and the corresponding theoretical feed value in the actual feed value set.

[0013] Preferably, the locking status of each locking component and screw is determined based on the relationship between each actual feed value and its corresponding theoretical feed value in the actual feed value set. This includes: setting a feed reference coefficient according to the screw specifications and model of the current batch; calculating the ratio of each actual feed value to its corresponding theoretical feed value; determining that the corresponding locking component and screw are not locked when the ratio is less than the feed reference coefficient; otherwise, determining that the corresponding locking component and screw are locked; in the case of not being locked, the control module indicates the locking component corresponding to the not locked screw for manual intervention to lock it; after the corresponding locking component and screw are locked, the control module controls the corresponding servo motor to drive the corresponding locking component to rotate, executing a leveling and locking strategy.

[0014] Preferably, the leveling and locking strategy specifically involves: after each locking component is locked to the screw, the detection module measures the height value of each locking component and uses it as a third dataset; the smallest value in the third dataset is selected as the reference value; the servo motor corresponding to the locking component whose height value in the third dataset is greater than the reference value is controlled to rotate, so that the locking component drives the screw to feed, until the height of the current locking component is measured to be equal to the reference value in real time, and the servo motor is stopped; after the height of all locking components reaches the reference value, a batch locking strategy is implemented.

[0015] Preferably, the batch tightening strategy specifically involves: obtaining the total number of screws to be tightened; if the total number of screws to be tightened is even, then the screws that are spaced apart are designated as the first batch, and the remaining screws are designated as the second batch; if the total number of screws to be tightened is odd, then two adjacent screws are selected first, and then the remaining screws are selected intermittently and designated as the first batch, and the remaining screws to be tightened are designated as the second batch; setting a target feed rate, driving the servo motor to rotate at a second speed, and alternately driving the servo motors corresponding to the first batch of screws and the second batch of screws multiple times to drive the screws until the first batch of screws and the second batch of screws reach the target feed rate, thus completing the screw pre-tightening; setting a locking feed rate, driving the servo motor to rotate at a third speed, driving the corresponding screw to reach the locking feed rate, thus completing the screw locking.

[0016] Preferably, the transmission mechanism further includes a first universal joint, with a transmission rod connected below the first universal joint. The transmission rod is inserted into a transmission sleeve, and a limiting part is provided at the lower end of the transmission rod. A limiting groove is provided on the transmission sleeve, and the limiting part is engaged in the limiting groove. An elastic element is sleeved on the outer periphery of the transmission rod. The upper end of the elastic element abuts against the lower end of the first universal joint, and the lower end of the elastic element abuts against the upper end of the transmission sleeve. A second universal joint is connected below the transmission sleeve, and a locking member is connected below the second universal joint. The locking member passes through a guide cylinder and extends below the guide cylinder.

[0017] Preferably, the clamping member is provided with a clamping groove, and a fastener is provided in the clamping groove. The fastener passes through the adjustment groove, and the position of the guide cylinder can be adjusted by adjusting the position of the fastener in the clamping groove and the adjustment groove.

[0018] Preferably, the detection module includes a guide section, which includes a bearing fixed on a locking member. The bearing is embedded in a support section, and a ball bearing is provided on the outer periphery of the support section. The ball bearing contacts the inner wall of the guide cylinder and can rotate freely within the support section. It also includes a ranging module, which is located below the guide cylinder.

[0019] Preferably, it also includes a drive cylinder, the output end of which is connected to the support platform. The support platform is connected to the adjustment platform via an adjusting component. The drive cylinder can drive the support platform and the adjustment platform to move up and down synchronously. The adjusting component can adjust the distance between the support platform and the adjustment platform.

[0020] Preferably, the adjusting component includes an adjusting sleeve, an adjusting nut, and an adjusting screw. The adjusting sleeve is fixedly connected to the adjusting platform, the adjusting nut is fixed to the adjusting screw, the adjusting screw is rotatably connected to the lower end of the support platform, and the adjusting screw is threadedly connected to the adjusting sleeve. The adjusting component, in conjunction with the detection module, can adjust the height of the locking component to accommodate the locking requirements of screws of different lengths.

[0021] The present invention has at least the following beneficial effects:

[0022] 1. This invention, by incorporating bearings, supports, and ball bearings on the locking component, in conjunction with a guide cylinder and a ranging module, avoids direct frictional contact between the locking component and the inner wall of the guide cylinder, ensuring the stability of the locking component during axial rotation. This prevents the locking component from tilting within the guide cylinder when the transmission rod becomes inclined, thus preventing the tilted locking component from properly locking the screws and damaging the compressor housing. Furthermore, it allows the locking component to slide stably up and down along the central axis of the guide cylinder, enabling precise positioning and locking with the screws below it. This prevents the locking component from becoming misaligned, failing to lock the screws, or damaging the surface of the compressor housing to be locked during descent.

[0023] 2. This invention, by setting bearings, supports, and balls on the locking component, creates an installation gap between the locking component and the inner wall of the guide cylinder for mounting the bearings, supports, and balls. This installation gap also creates conditions for the ranging module to measure the vertical movement height of the support, simplifying the measurement method of the locking component. At the same time, it effectively realizes the measurement of the movement height of the locking component, creating favorable conditions for selecting the screw tightening strategy based on the height data of the locking component.

[0024] 3. By setting adjustment grooves, clamping grooves, clamping components, and locking components on the adjustment platform, this invention can freely adjust and rearrange the positions of the guide cylinders according to the distribution of the screw holes to be locked, so that the positions of multiple guide cylinders correspond one-to-one with the screw hole positions. This ensures that the guide cylinders guide the locking components to accurately align with the screw heads. When changing product types, there is no need to replace the entire adjustment platform; only the clamping components and guide cylinders need to be rearranged to complete the equipment debugging, significantly improving the equipment's versatility and ease of maintenance.

[0025] 4. This invention, through the use of a ranging module in conjunction with a support unit, locking components, and other structures, can accurately measure the height data of the locking components. During the screw tightening process, it can implement pre-tightening strategies, leveling tightening strategies, and batch tightening strategies, ensuring a reasonable tightening sequence and uniform force distribution, preventing deformation of the compressor housing or damage to the screws and threads, and achieving high-precision, intelligent, and fully closed-loop controlled automatic screw-locking operation.

[0026] 5. By setting up a detection module and a drive cylinder, adjusting components, and other structures, this invention ensures that the lower end of the locking component remains in a compressed and locked state with the screw nut during the screw tightening process. This ensures that the locking component can effectively drive the screw to rotate and tighten throughout the entire process, thereby adapting to the tightening requirements of screws of different lengths, achieving precise control of the tightening height, and ensuring the compatibility and adaptability of the equipment in the production of multi-specification products. Attached Figure Description

[0027] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a schematic diagram showing the distribution of screws to be tightened on the compressor housing of the present invention;

[0029] Figure 3 This is a three-dimensional schematic diagram of the transmission mechanism and adjusting component of the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of the clamping component and guide cylinder on the adjustment platform of the present invention;

[0031] Figure 5 This is a schematic diagram of the transmission mechanism and clamping component of the present invention;

[0032] Figure 6 This is a three-dimensional schematic diagram of the detection module, locking component, and guide cylinder of the present invention;

[0033] Figure 7 This is a cross-sectional schematic diagram of the detection module, locking component, and guide cylinder of the present invention.

[0034] In the picture:

[0035] 1. Supporting platform;

[0036] 2. Servo motor;

[0037] 3. Transmission mechanism; 31. Locking element; 32. First universal joint; 33. Transmission rod; 34. Transmission sleeve; 35. Limiting part; 36. Limiting groove; 37. Elastic element; 38. Second universal joint; 4. Adjustment platform; 41. Adjustment groove; 42. Clamping element; 43. Guide cylinder; 44. Clamping groove; 45. Fastener;

[0038] 5. Detection module; 51. Guide section; 511. Bearing; 512. Support section; 513. Ball bearing; 514. Distance measuring module;

[0039] 6. Drive cylinder;

[0040] 7. Control module;

[0041] 8. Adjusting component; 81. Adjusting sleeve; 82. Adjusting nut; 83. Adjusting screw. Detailed Implementation

[0042] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0043] Example 1

[0044] like Figures 1 to 7 As shown, this invention provides a screw-locking machine for processing screws on a compressor housing, including a support platform 1. Multiple servo motors 2 are mounted on the support platform 1. The output end of each servo motor 2 passes through the support platform 1 and is connected to a transmission mechanism 3. The transmission mechanism 3 drives a locking member 31 below it to rotate and lock the screw. Specifically, the servo motor 2 is mounted as a power source on the upper surface of the support platform 1, and its output axis passes downward through a through hole in the support platform 1 and is connected to the upper end of the transmission mechanism 3 to transmit rotational power. The transmission mechanism 3 is located below the support platform 1 and is used to transmit the rotational motion of the servo motor 2 to the locking member 31, enabling it to drive the screw to rotate and complete the locking action.

[0045] The transmission mechanism 3 also includes a first universal joint 32, which is connected below the output end of the servo motor 2. This allows the transmission direction to deviate within a certain angle range, compensating for coaxiality errors that may occur during assembly and also enabling changes in the transmission direction. A transmission rod 33 is connected to the lower end of the first universal joint 32. The transmission rod 33 extends vertically downwards and inserts into the transmission sleeve 34, forming a sliding fit structure. A limiting part 35 is provided at the lower end of the transmission rod 33, and a limiting groove 36 is formed on the side wall of the transmission sleeve 34. The limiting part 35 engages within the limiting groove 36, allowing the transmission rod 33 to slide axially up and down within the transmission sleeve 34. It also allows the transmission rod 33 to drive the transmission sleeve 34 to rotate via the limiting part 35, thereby ensuring effective torque transmission.

[0046] An elastic element 37 is sleeved around the outer periphery of the transmission rod 33. The elastic element 37 is a compression spring or a compression sleeve. Its upper end abuts against the lower end face of the first universal joint 32, and its lower end abuts against the upper end face of the transmission sleeve 34. In this way, on the one hand, it can provide a downward preload through the pre-compression state to ensure that the locking element 31 can always squeeze and lock the screw when tightening the screw. On the other hand, it can absorb the impact load during the tightening process and provide a buffer when the screw contacts the compressor housing to prevent the screw from stripping or damaging the surface of the compressor housing to be tightened due to excessive rigidity. The lower end of the transmission sleeve 34 is connected to a second universal joint 38, which is fixedly connected to the locking member 31. This connection serves two purposes: firstly, it transmits rotational torque to the locking member 31, ensuring that the locking member 31 can slide freely up and down axially while rotating; secondly, the cooperation of the first universal joint 32 and the second universal joint 38 allows for a connection angle between the transmission rod 33 and the locking member 31, enabling multiple locking members 31 to move closer or further apart, thus improving their applicability. For example, when multiple locking members 31 are far apart, they can be used to tighten screws on a compressor housing with a diameter of 100mm, while when they are close together, they can be used to tighten screws on a compressor housing with a diameter of 40mm. The lower end of the locking member 31 is a replaceable bit structure, suitable for screws of different sizes. The upper end of the locking member 31 is connected to the transmission sleeve 34 via the second universal joint 38, and the lower end passes through the guide cylinder 43 and extends below it for locking and screwing in screws. During operation, after the servo motor 2 starts, it transmits rotational power to the locking member 31 in a stable manner through the flexible transmission consisting of the first universal joint 32, the transmission rod 33, the transmission sleeve 34 and the second universal joint 38. At the same time, under the action of the elastic member 37, the locking member 31 can automatically adjust its height according to the screw feed depth to ensure that the locking member 31 is always locked with the corresponding screw when the screw is tightened.

[0047] Specifically, such as Figure 4 and Figure 5As shown, an adjustment groove 41 is provided above the adjustment platform 4. The adjustment groove 41 is a long strip-shaped through groove formed on the upper surface of the adjustment platform 4 around its perimeter. It is arranged in an array structure along the horizontal and vertical directions of the adjustment platform 4, and generally multiple grooves are provided in each direction, for flexibly adjusting the position of multiple clamping parts 42. The clamping parts 42 are detachably set in the adjustment groove 41, and can be freely adjusted and rearranged according to the distribution of the screw holes to be locked, so as to adapt to the locking requirements of different models of products. Each clamping part 42 is fixedly clamped with a guide cylinder 43. The guide cylinder 43 is a cylindrical structure with its axis perpendicular to the plane of the adjustment platform 4. It is used to guide the locking part 31 to slide up and down along a predetermined trajectory and maintain coaxiality during rotation, thereby ensuring the screw locking accuracy.

[0048] The locking element 31 passes through the guide cylinder 43 from top to bottom and can rotate and slide axially within it. The guide cylinder 43 provides radial support and limits for the locking element 31, preventing it from swaying during high-speed rotation or uneven force, thereby ensuring the stability and accuracy of the screw-in process. The positions of multiple guide cylinders 43 correspond one-to-one with the screw hole positions. By adjusting the installation position of the clamping element 42 in the adjusting groove 41, the spatial layout of the guide cylinders 43 can be reconfigured to meet the requirements of rapid changeover in production scenarios with multiple varieties and different batches.

[0049] Furthermore, the clamping member 42 is provided with a clamping groove 44, which is a groove extending through both the upper and lower ends of the clamping member 42. A fastener 45 is provided within the clamping groove 44. The fastener 45 is a screw structure, with its rod passing through the side wall of the clamping groove 44 and extending into the adjusting groove 41, engaging with the adjusting groove 41 on the adjusting platform 4. By loosening the fastener 45, the clamping member 42 can slide within the adjusting groove 41, thereby causing the guide cylinder 43 to shift as a whole. Once the position is adjusted, tightening the fastener 45 securely locks the clamping member 42 onto the adjusting platform 4. This structure allows operators to precisely set the spatial coordinates of each guide cylinder 43 according to actual needs, ensuring that the locking member 31 is accurately aligned with the screw nut. Because the clamping member 42 is detachable, when changing product types, it is not necessary to replace the entire adjusting platform 4; only the clamping member 42 and guide cylinder 43 need to be rearranged to complete equipment debugging, significantly improving the equipment's versatility and ease of maintenance.

[0050] A detection module 5 is installed below the guide cylinder 43 to measure the axial position of the locking component 31 in real time during the locking process, i.e., its height relative to the adjustment platform 4. This height data is a key parameter for realizing intelligent locking control, providing feedback to the control module 7 to determine whether the screw is effectively locked with the locking component 31, whether there is stripping or free rotation, and to support the subsequent leveling and batch locking strategies.

[0051] Specifically, the detection module 5 includes a guide part 51, which is integrated into the transmission path between the locking member 31 and the guide cylinder 43, serving both guiding assistance and displacement measurement functions. The guide part 51 includes a bearing 511 fixed to the outer periphery of the locking member 31. This bearing 511 is sleeved and fastened to the lower shaft of the locking member 31, rotating and moving up and down synchronously with the locking member 31. The bearing 511 is connected to the locking member 31 via a spline, facilitating its removal and replacement. The bearing 511 is embedded in a support part 512, which is an annular fixed seat. Multiple balls 513 are evenly distributed around the outer periphery of the support part 512. Specifically, the balls 513 are limited and locked within the annular groove of the support part 512, allowing them to roll freely along the groove. The outer surface of the ball 513 is in close contact with the inner wall of the guide cylinder 43. During the up-and-down movement of the locking member 31, the ball 513 rolls along the inner wall of the guide cylinder 43 as the locking member 31 moves up and down, which reduces the frictional resistance of the movement and maintains the center alignment of the locking member 31.

[0052] like Figure 6 and Figure 7 As shown, it also includes a ranging module 514, which is located below the guide cylinder 43 and is used to measure the height of the support part 512 as it moves up and down. At the same time, since the bearing 511 is fixedly connected to the locking member 31, its axial displacement fully reflects the actual movement of the locking member 31. Therefore, the height information of the locking member 31 can be accurately obtained by detecting the position change of the support part 512 through the ranging module 514. For example, if the ranging module 514 detects that the height of the support part 512 drops by 100mm, the height of the corresponding locking member 31 also drops by 100mm, and the heights of the support part 512 and the locking member 31 are the same.

[0053] It is important to emphasize that the structural arrangement of the bearing 511, support 512, and ball bearing 513 in the guide section 51 ensures that the locking member 31 can rotate stably within the guide cylinder 43, preventing direct frictional contact between the locking member 31 and the inner wall of the guide cylinder 43. This guarantees the stability of the locking member 31 during axial rotation and avoids the direct contact between the locking member 31 and the guide cylinder 43, as is seen in the prior art. This prevents wear and increased clearance between the locking member 31 and the guide cylinder 43 after prolonged high-speed rotation, which can lead to issues when the transmission rod 33 is tilted. When the transmission rod 33 drives the locking member 31 through the second universal joint 38, it exerts a diagonal thrust on the locking member 31, resulting in a locking failure. If locking component 31 tilts within the guide cylinder 43, it will be unable to lock with the corresponding screw, preventing proper screw tightening. More seriously, the tilted locking component 31 may directly contact the compressor housing, potentially damaging it during rapid rotation and causing product damage. The aforementioned structure perfectly avoids these problems, ensuring product quality. Furthermore, this structure allows the locking component 31 to slide stably up and down along the central axis of the guide cylinder 43, enabling precise positioning and tightening with the screw below it. This prevents the locking component 31 from tilting, failing to tighten the screw, or damaging the surface of the compressor housing during descent. Furthermore, the aforementioned structure creates an installation gap between the locking component 31 and the inner wall of the guide cylinder 43 for mounting the bearing 511, support 512, and ball bearing 513. This installation gap also creates conditions for the ranging module 514 to measure the vertical movement height of the support 512, simplifying the measurement method of the locking component 31. At the same time, it effectively realizes the measurement of the movement height of the locking component 31, creating conditions for selecting a screw tightening strategy based on the height data of the locking component 31.

[0054] Example 2

[0055] In one embodiment, during the screw-to-hole alignment and initial pre-tightening stage, although existing technologies employ robotic grippers or industrial computers for pre-tightening, significant risks remain. For instance, the high speed of the robotic gripper means that any misalignment between the screw and hole can lead to stripping or damage to the compressor housing during initial pre-tightening, rendering the compressor housing unusable. Therefore, in practice, considering the importance of screw-to-hole alignment in the entire screw-tightening process, operators typically perform the initial pre-tightening. This involves aligning the screw with the hole and then manually screwing it in, thus avoiding the aforementioned problems. However, manual operation is often subjective and non-standardized, resulting in inconsistent screw turns and varying feed rates. Consequently, the final screw nut orientation also varies. Figure 2The diagram shows the distribution of hexagonal screws, with arrows indicating the direction of the nuts. To accommodate screws of different sizes and models, a removable and replaceable hexagonal socket is typically provided at the lower end of the locking element 31. When the locking element 31 moves downwards to insert the lower hexagonal socket into the screw nut and tighten, the hexagonal nut and socket are not aligned. Therefore, the locking element 31 cannot tighten with the screw after downward movement and instead presses directly on the screw nut. In this situation, if the locking element 31 rotates rapidly, it will directly rotate on the screw nut, damaging the screw or its threads. Secondly, when tightening screws of different batches and models, if the operator forgets to replace the lower hexagonal socket of the locking element 31, resulting in the socket being larger or smaller than the screw nut, the screw cannot be tightened smoothly. Furthermore, because the socket and nut are in contact, although this may cause the screw to rotate slightly, this situation is not easily detected in time, ultimately resulting in the screw not being tightened.

[0056] Therefore, in this embodiment, it is necessary to use the ranging module 514 of the detection module 5 to measure the height data of the locking member 31, and then take a corresponding locking strategy to better solve the above problems.

[0057] Specifically, before locking the screw, the control module 7 controls the detection module 5 to measure the initial height of each locking component 31 and use it as the first dataset. The control module 7 controls all servo motors 2 to rotate at the first speed for the first preset time. After the first preset time, the detection module 5 measures the height of each locking component 31 and uses it as the second dataset. Based on the relationship between the second dataset and the first dataset, the control module 7 selects to execute the corresponding locking strategy and gradually tightens the screw.

[0058] Furthermore, the locking strategy includes a pre-tightening execution strategy, specifically:

[0059] Get the specifications and model of the screws in the current batch, and obtain the parameters of the screws in the current batch, such as the screw pitch being 1mm;

[0060] Calculate the theoretical feed value of the screws in the current batch rotating at the first speed and the first preset time. For example, if the first speed is 2 r / s and the first preset time is 5s, then the theoretical feed value is: 1*2*5=10mm.

[0061] It should be noted that the first rotational speed is a low speed. The reason for this setting is that the internal hex socket at the lower end of the locking part 31 matches the screw. However, if the two are not aligned, the internal hex socket will press against the screw and rotate slowly. The internal hex socket can rotate and lock the screw nut, creating conditions for the screw to rotate further into the screw hole. In this case, the internal hex socket will spin freely in the early stage, and the actual feed value will be slightly less than the theoretical feed value. For example, the actual feed value is 7mm.

[0062] The difference between the height values ​​of each locking component 31 in the first dataset and the height values ​​of each corresponding locking component 31 in the second dataset is calculated and used as the actual feed value to obtain the actual feed value set.

[0063] Based on the relationship between each actual feed value and its corresponding theoretical feed value in the actual feed value set, the locking status of each locking component 31 and the screw is determined, specifically as follows:

[0064] Set the feed reference coefficient according to the specifications and model of the current batch of screws; specifically, for screws with large pitch, set the feed reference value to be larger, such as 0.5; for screws with small pitch, set the feed reference value to be smaller, such as 0.2.

[0065] Calculate the ratio of each actual feed value to its corresponding theoretical feed value; for example, if the actual feed value measured for one screw is 9.5mm, then the ratio is: 9.5 / 10=0.95;

[0066] When the ratio is less than the feed reference coefficient, it is determined that the corresponding locking element 31 is not locked to the screw; otherwise, it is determined that the corresponding locking element 31 is locked to the screw. For example, if the feed reference coefficient is set to 0.5, for a screw with an actual feed value of 7mm, the theoretical feed value is 10mm, so the ratio is 7 / 10=0.7, which is greater than 0.5, so it is considered that the locking element 31 is locked to the screw. However, in the above description, if the internal hexagonal socket at the lower end of the locking element 31 is larger or smaller than the screw nut, it cannot drive the screw to feed normally, or it can only drive the screw to rotate by squeezing friction and have a very small amount of feed, such as an actual feed value of 2mm, so the ratio is 2 / 10=0.2, which is less than 0.5, so it is considered that the locking element 31 is not locked to the screw.

[0067] If the screw is not tightened, the control module 7 indicates the locking part 31 corresponding to the screw that is not tightened, and performs manual intervention to tighten it;

[0068] After the corresponding locking part 31 and the screw are tightened, the control module 7 controls the corresponding servo motor 2 to drive the corresponding locking part 31 to rotate, and executes the leveling and locking strategy; in this way, before further tightening the screw, the locking part 31 can be locked to the screw, and the locking part 31 can smoothly drive the screw to rotate.

[0069] Specifically, the leveling and locking strategy is as follows:

[0070] After each locking component 31 is tightened with the screw, the detection module 5 measures the height value of each locking component 31 and uses it as the third dataset.

[0071] Select the smallest value in the third dataset and use it as the baseline value;

[0072] The servo motor 2 corresponding to the locking part 31 whose height value in the third data set is greater than the reference value is rotated, so that the locking part 31 drives the screw to feed until the height of the current locking part 31 is equal to the reference value, and then the servo motor 2 is stopped.

[0073] After all locking components 31 reach the reference height, a batch locking strategy is implemented.

[0074] By implementing the above-mentioned phased leveling and tightening strategy, multiple screws can be placed at the same height, preparing for the phased tightening of screws.

[0075] Specifically, the phased locking strategy is as follows:

[0076] Get the total number of screws to be tightened;

[0077] If the total number of screws to be tightened is even, the screws that are spaced apart from each other are designated as the first batch, and the remaining screws are designated as the second batch.

[0078] If the total number of screws to be tightened is odd, first select two adjacent screws, and then select the remaining screws in turn at intervals and designate them as the first batch, and the remaining screws to be tightened as the second batch.

[0079] Set the target feed amount, drive the servo motor 2 to rotate at the second speed, and drive the servo motor 2 corresponding to the first batch of screws and the second batch of screws alternately multiple times to drive the screws until the first batch of screws and the second batch of screws reach the target feed amount, thus completing the screw pre-tightening; it should be noted that the second speed can be the rated speed of the servo motor 2, which can realize the rapid feeding of screws and complete the pre-tightening.

[0080] Set the locking feed amount, drive servo motor 2 to rotate at the third speed, drive the corresponding screw to reach the locking feed amount, and complete the screw locking; it should be noted that the third speed is less than the second speed to ensure the smooth progress of the final stage of locking.

[0081] By tightening in batches, the entire process is dynamically decided by the control module 7 based on the data feedback from the detection module 5 in real time, ensuring that the tightening sequence is reasonable and the force is even, preventing the compressor housing from deforming or the screws from being damaged, and realizing high-precision, intelligent, and fully closed-loop control of automatic screw tightening operation.

[0082] Example 3

[0083] In another embodiment, specifically, such as Figure 1 and Figure 3As shown, the support platform 1 is also connected to the drive cylinder 6. The output end of the drive cylinder 6 is fixedly connected to the support platform 1, which can drive the entire support platform 1 and its servo motor 2 and transmission mechanism 3 to move up and down synchronously, so as to adjust the distance between the two and the compressor housing to be locked, so as to suit the different needs of different compressor housings to be locked.

[0084] Furthermore, it also includes an adjusting component 8, which includes an adjusting sleeve 81, an adjusting nut 82, and an adjusting screw 83. The adjusting sleeve 81 is fixedly connected to the adjusting platform 4, the adjusting nut 82 is fixed on the adjusting screw 83, the adjusting screw 83 is rotatably connected to the lower end of the support platform 1, and the adjusting screw 83 is threadedly connected to the adjusting sleeve 81. The adjusting component 8, in conjunction with the detection module 5, can adjust the height of the locking component 31 to meet the locking requirements of screws of different lengths.

[0085] Specifically, this adjustment process works in conjunction with the detection module 5: when adapting to screws of different specifications, for example, after changing from a screw with a locking length of 50mm to a screw with a locking length of 80mm, the adjusting nut 82 drives the adjusting screw 83 to rotate, and the adjusting screw 83 is screwed into the adjusting sleeve 81. Then, the adjusting sleeve 81 drives the adjusting platform 4 to move closer to the support platform 1, and the locking component 31 will move downward relative to the guide cylinder 43. During this process, the distance measuring module 514 measures the height of the support part 512 as it descends, thereby accurately obtaining the height of the locking component 31 as it descends. Through the real-time measurement of the distance measuring module 514, the height of the locking component 31 as it descends during this process can be accurately controlled, and it can be ensured that this length is greater than the locking length of the replaced screw. For example, if the locking component 31 descends by 100mm, it is greater than the locking length of the screw of 80mm. After the screw is locked, the locking component 31 can still be squeezed and locked with the screw. Then, the control cylinder 6 drives the support platform 1 and the adjustment platform 4 to move downwards synchronously, so that all the locking parts 31 are in contact with the corresponding screws. Then, the support platform 1 and the adjustment platform 4 continue to move downwards synchronously. Under the obstruction of the screws, the locking parts 31 move upwards relative to the guide cylinder 43. At this time, the distance measuring module 514 measures the rising height of the support part 512 in real time, which is also the rising height of the locking parts 31. For example, it stops after rising 100mm. Since the rising height of 100mm is greater than the current screw locking length of 80mm, it can be ensured that the lower end of the locking part 31 can always be kept in a squeezed and locked state with the screw nut during the screw locking process. This ensures that the locking part 31 can effectively drive the screw to rotate and lock throughout the process, thus adapting to the locking requirements of screws of different lengths. This structure is used in conjunction with the detection module 5 to achieve precise control of the locking height, ensuring the compatibility and adaptability of the equipment in the production of multi-specification products.

[0086] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0087] Although embodiments of the invention have been shown and described, those skilled in the art will recognize that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A screw-locking machine for machining screws on a compressor housing, characterized in that, include: A support platform (1) is provided with multiple servo motors (2). The output end of each servo motor (2) passes through the support platform (1) and is connected to a transmission mechanism (3). The transmission mechanism (3) drives the locking part (31) below it to rotate to lock the screw. An adjustment platform (4) is provided above an adjustment groove (41). Multiple clamping parts (42) are detachably provided in the adjustment groove (41). The clamping parts (42) clamp a guide cylinder (43). The locking part (31) rotates and slides up and down in the guide cylinder (43). A detection module (5) is provided below the guide cylinder (43) for measuring the height of the locking component (31); Before locking the screw, the control module (7) controls the detection module (5) to measure the initial height of each locking component (31) and use it as the first dataset. The control module (7) controls all servo motors (2) to rotate at the first speed for the first preset time. After the first preset time, the detection module (5) measures the height of each locking component (31) and uses it as the second dataset. The control module (7) selects to execute the corresponding locking strategy according to the relationship between the second dataset and the first dataset, and gradually tightens the screw. The locking strategy includes a pre-tightening execution strategy, specifically: obtaining the specifications and models of the current batch of screws, and obtaining the parameters of the current batch of screws; calculating the theoretical feed value of the current batch of screws rotating at a first speed and a first preset time; calculating the difference between the height value of each locking component (31) in the first dataset and the height value of each corresponding locking component (31) in the second dataset and using it as the actual feed value, and obtaining the actual feed value set; Based on the relationship between each actual feed value and the corresponding theoretical feed value in the actual feed value set, the locking status of each locking component (31) and the screw is determined; Based on the relationship between each actual feed value and the corresponding theoretical feed value in the actual feed value set, the locking status of each locking component (31) and screw is determined, including: setting the feed reference coefficient according to the current batch screw specifications; calculating the ratio of each actual feed value to the corresponding theoretical feed value; when the ratio is less than the feed reference coefficient, it is determined that the corresponding locking component (31) and screw are not locked; otherwise, it is determined that the corresponding locking component (31) and screw are locked; in the case of not being locked, the control module (7) indicates the locking component (31) corresponding to the not locked screw and performs manual intervention to lock it; after the corresponding locking component (31) and screw are locked, the control module (7) controls the corresponding servo motor (2) to drive the corresponding locking component (31) to rotate and execute the leveling locking strategy; The leveling and locking strategy is as follows: after each locking component (31) is locked with the screw, the detection module (5) measures the height value of each locking component (31) and uses it as the third dataset; selects the smallest value in the third dataset and uses it as the reference value; controls the servo motor (2) corresponding to the locking component (31) whose height value in the third dataset is greater than the reference value to rotate, so that the locking component (31) drives the screw to feed until the height of the current locking component (31) is measured in real time to be equal to the reference value, and stops the servo motor (2); after the height of all locking components (31) reaches the reference value, the batch locking strategy is performed.

2. The screw-fastening machine for processing screws on the compressor housing according to claim 1, characterized in that, The batch locking strategy is as follows: Get the total number of screws to be tightened; If the total number of screws to be tightened is even, the screws that are spaced apart from each other are designated as the first batch, and the remaining screws are designated as the second batch. If the total number of screws to be tightened is odd, first select two adjacent screws, and then select the remaining screws in turn at intervals and designate them as the first batch, and the remaining screws to be tightened as the second batch. Set the target feed amount, drive the servo motor (2) to rotate at the second speed, and drive the servo motor (2) corresponding to the first batch of screws and the second batch of screws alternately multiple times to drive the screws until the first batch of screws and the second batch of screws reach the target feed amount and complete the screw pre-tightening; Set the lock-up feed amount, drive the servo motor (2) to rotate at the third speed, drive the corresponding screw to reach the lock-up feed amount, and complete the screw lock-up.

3. The screw-fastening machine for processing screws on the compressor housing according to claim 1, characterized in that, The transmission mechanism (3) further includes a first universal joint (32), a transmission rod (33) is connected below the first universal joint (32), the transmission rod (33) is inserted into the transmission sleeve (34), the lower end of the transmission rod (33) is provided with a limiting part (35), the transmission sleeve (34) is provided with a limiting groove (36), the limiting part (35) is engaged in the limiting groove (36), the outer periphery of the transmission rod (33) is sleeved with an elastic element (37), the upper end of the elastic element (37) abuts against the lower end of the first universal joint (32), the lower end of the elastic element (37) abuts against the upper end of the transmission sleeve (34); a second universal joint (38) is connected below the transmission sleeve (34), the lower end of the second universal joint (38) is connected to a locking member (31), the locking member (31) passes through the guide cylinder (43) and extends to the lower part of the guide cylinder (43).

4. The screw-fastening machine for processing screws on the compressor housing according to claim 1, characterized in that, The clamping member (42) is provided with a clamping groove (44), and a fastener (45) is provided in the clamping groove (44). The fastener (45) passes through the adjustment groove (41). By adjusting the position of the fastener (45) in the clamping groove (44) and the adjustment groove (41), the position of the guide cylinder (43) can be adjusted.

5. The screw-fastening machine for processing screws on the compressor housing according to claim 1, characterized in that, The detection module (5) includes a guide part (51), which includes a bearing (511) fixed on a locking member (31). The bearing (511) is embedded in a support part (512). A ball (513) is provided on the outer periphery of the support part (512). The ball (513) contacts the inner wall of the guide cylinder (43) and can rotate freely within the support part (512). It also includes a ranging module (514), which is located below the guide tube (43).

6. The screw-fastening machine for processing screws on the compressor housing according to claim 1, characterized in that, It also includes a drive cylinder (6), the output end of which is connected to the support platform (1). The support platform (1) is connected to the adjustment platform (4) through an adjustment component (8). The drive cylinder (6) can drive the support platform (1) and the adjustment platform (4) to move up and down synchronously. The adjustment component (8) can adjust the distance between the support platform (1) and the adjustment platform (4).

7. The screw-fastening machine for machining compressor housing screws according to claim 6, characterized in that, The adjusting component (8) includes an adjusting sleeve (81), an adjusting nut (82), and an adjusting screw (83). The adjusting sleeve (81) is fixedly connected to the adjusting platform (4). The adjusting nut (82) is fixed on the adjusting screw (83). The adjusting screw (83) is rotatably connected to the lower end of the support platform (1). The adjusting screw (83) is threadedly connected to the adjusting sleeve (81). The adjusting component (8), in conjunction with the detection module (5), can adjust the height of the locking component (31) to adapt to the locking requirements of screws of different lengths.

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