Feeding device for screw grinding

Abstract

The utility model relates to the technical field of screw machining, and discloses a feeding device for screw polishing. The feeding device is characterized in that the feeding device comprises a workbench, a fixing plate, a pushing mechanism, a positioning mechanism and a controller, the fixing plate, the pushing mechanism and the positioning mechanism are arranged on the workbench, and the positioning mechanism comprises a driving roller, a driven roller, a distance measuring sensor and a servo motor; the driving roller and the driven roller are arranged on the workbench through a driving shaft and a driven shaft, and the servo motor is in transmission connection with the driving shaft. According to the feeding device, the screw rod is placed on the fixing plate, the pushing mechanism pushes the screw rod to the positioning mechanism, the servo motor drives the screw rod to rotate slowly, the distance measuring sensor finds and detects the thread starting point position of the screw rod through distance measurement, and when measured data reach a preset range, the screw rod stops rotating to form positioning so that the screw rod can be grabbed by a mechanical arm. Therefore, the screw rod can be smoothly ground and polished, and threads of the screw rod cannot be damaged during grinding.

Description

Technical Field

[0001] The utility model relates to the technical field of screw rod processing, in particular to a feeding device for screw rod grinding. Background Art

[0002] The steering screw (lead screw) of the automobile steering system includes a smooth circle section and a threaded section, and a plane is provided on the circumferential side wall of the middle section of the smooth circle section, and a linear rack is formed on the plane of the smooth circle section. The steering screw for automobiles has very high requirements on the finish of the screw tooth groove (thread) and the circumferential outer wall (tooth back) of the smooth circle section.

[0003] The steering screw for automobiles is usually processed by rolling the bar into shape through a rolling machine, and then the tooth grooves and tooth backs (smooth surfaces) of the screw are polished by grinding and polishing equipment to achieve the required accuracy and finish of the steering screw.

[0004] The inventor of this application found that the current grinding and polishing of steering screws requires multiple devices and multiple processes, and the processing efficiency is low. Therefore, it is necessary to develop intelligent processing equipment for steering screws, and to grasp the screws through a robot to achieve integrated automatic grinding and polishing of steering screws. When grinding the tooth grooves of the screws, the abrasive needs to be accurately embedded in the tooth grooves of the screws. Therefore, how to load the processing equipment and accurately position the screws for the robot to grasp, so as to achieve accurate grinding and polishing of the screws, is a technical problem that needs to be solved urgently by technical personnel in the industry. Utility Model Content

[0005] The purpose of the utility model is to provide a feeding device for screw grinding to solve the problems in the above-mentioned background technology.

[0006] The embodiment of the utility model provides a feeding device for screw grinding, comprising: a workbench, a fixing plate, a pushing mechanism, a positioning mechanism and a controller;

[0007] The fixing plate, the pushing mechanism and the positioning mechanism are arranged on the workbench;

[0008] The fixing plate is used for placing the screw rod;

[0009] The pushing mechanism is arranged between the fixing plate and the positioning mechanism, and is used to push the screws on the fixing plate onto the positioning mechanism in sequence;

[0010] The positioning mechanism comprises: an active roller, a driven roller, a distance measuring sensor and a servo motor;

[0011] The active roller and the driven roller are rotatably arranged on the workbench through a driving shaft and a driven shaft respectively, and are used to receive the screw rod;

[0012] The servo motor is drivingly connected to the driving shaft and is used to drive the screw to rotate;

[0013] The pushing mechanism, the servo motor and the distance measuring sensor are electrically connected to the controller respectively. The distance measuring sensor is used to detect the starting position of the screw thread and send the detection data to the controller. The controller is used to stop the rotation of the screw when the detection data reaches a preset range for the robot to grasp.

[0014] Based on the above scheme, it can be known that the feeding device for screw grinding of the utility model is provided with a workbench, a fixed plate, a pushing mechanism, a positioning mechanism and a controller. The fixed plate, the pushing mechanism and the positioning mechanism are provided on the workbench. The positioning mechanism includes: an active roller, a driven roller, a distance sensor and a servo motor. The active roller and the driven roller are provided on the workbench through an active shaft and a driven shaft. The servo motor is connected to the active shaft by transmission. In the feeding device for screw grinding of the utility model, the screws to be ground are placed on the fixed plate in sequence, and the pushing mechanism pushes the screw closest to the positioning mechanism onto the active roller and the driven roller. Then the servo motor drives the active shaft and the screw to rotate slowly. The distance sensor detects the distance between the starting point of the screw thread and finds the starting point of the screw thread, and sends the detection data to the controller. When the detection data detected by the distance sensor reaches the preset range, the controller controls the screw to stop rotating, and the screw is positioned on the active roller and the driven roller. After the robot grabs it, the screw is also accurately positioned on the robot to grind the screw smoothly, and the screw thread will not be damaged during grinding.

[0015] In a feasible solution, a support plate and a stopper are provided on the fixing plate;

[0016] There are a plurality of support plates, and the plurality of support plates are arranged on the fixing plate at intervals for placing screw rods;

[0017] The fixing plate is tilted so that the screw rod can be rotatably placed on the fixing plate and the supporting plate;

[0018] The stopper is located at the outer side of the supporting plate and is used to stop the screw rod on the fixing plate.

[0019] In a feasible solution, the support plate located at the outermost side is provided with a limit baffle.

[0020] In a feasible solution, the fixing plate is provided with a bolt slot;

[0021] The support plate is slidably arranged in the bolt groove through a fixing bolt.

[0022] In a feasible solution, the pushing mechanism includes: a telescopic cylinder and a pushing block;

[0023] The fixing plate is provided with a rectangular through hole at the gap between the supporting plate and the baffle;

[0024] The telescopic cylinder is arranged on the workbench, the pushing block is connected to the movable rod of the telescopic cylinder and is slidably arranged in the rectangular through hole, and when the movable rod of the telescopic cylinder is extended, the pushing block is used to push the screw rod so that the screw rod slides over the stopper.

[0025] In a feasible solution, the top surfaces of the pushing block and the blocking block are both provided with inclined surfaces, and the lower ends of the inclined surfaces are located on a side close to the positioning mechanism.

[0026] In a feasible solution, a protruding push block is provided on the top of the push block, and the side surface of the protruding push block is an inclined surface for abutting against the screw rod.

[0027] In a feasible solution, the support plate, the pushing block and the protruding pushing block are made of plastic;

[0028] The active roller and the driven roller are both covered with plastic sleeves.

[0029] In a feasible solution, the positioning mechanism further includes: a supporting roller;

[0030] The supporting roller is arranged on the driving shaft, and a protruding ring is arranged on the circumferential side wall of the supporting roller. The protruding ring is used to be embedded in the tooth groove of the screw and to abut against the screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0032] Figure 1 It is a three-dimensional schematic diagram of a feeding device for screw grinding in an embodiment of the utility model;

[0033] Figure 2 In the embodiment of the utility model Figure 1 The enlarged view of A in FIG.

[0034] Figure 3 It is a top view schematic diagram of the feeding device in the embodiment of the utility model;

[0035] Figure 4 In the embodiment of the utility model Figure 3 A partial enlarged view of the

[0036] Figure 5 It is a side view schematic diagram of the feeding device in the embodiment of the utility model;

[0037] Figure 6 It is a schematic diagram of the pushing mechanism in the embodiment of the utility model.

[0038] Numbers in the figure:

[0039] 1. Workbench; 2. Fixing plate; 201. Bolt groove; 202. Rectangular through hole; 21. Support plate; 211. Limit baffle; 22. Block; 3. Pushing mechanism; 31. Pushing block; 311. Protruding pushing block; 4. Positioning mechanism; 401. Active shaft; 402. Driven shaft; 41. Active roller; 42. Driven roller; 43. Distance measuring sensor; 44. Support roller; 441. Protruding ring; 10. Screw. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] The following specific embodiments are used to describe the technical solution of the utility model in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0044] As described in the background technology of this application, during the processing of the steering screw for automobiles, the rod material is rolled into shape by a rolling machine, and then the tooth grooves and the tooth back (smooth surface) of the screw are polished by a grinding and polishing equipment to achieve the required accuracy and smoothness of the steering screw.

[0045] The inventor of this application found that the current grinding and polishing of steering screws requires multiple devices and multiple processes, and the processing efficiency is low. Therefore, it is necessary to develop intelligent processing equipment for steering screws, and to grasp the screws through a robot to achieve integrated automatic grinding and polishing of steering screws. When grinding the tooth grooves of the screws, the abrasive needs to be accurately embedded in the tooth grooves of the screws. Therefore, how to load the processing equipment and accurately position the screws for the robot to grasp, so as to achieve accurate grinding and polishing of the screws, is a technical problem that needs to be solved urgently by technical personnel in the industry.

[0046] In order to solve the above problems, the inventor of the present application proposed the technical solution of the present application, and the specific embodiments are as follows:

[0047] Figure 1 It is a three-dimensional schematic diagram of a feeding device for screw grinding in an embodiment of the utility model. Figure 2 In the embodiment of the utility model Figure 1 The enlarged view of A in Figure 3 Schematic diagram of a top view of a feeding device in an embodiment of the utility model. Figure 4 In the embodiment of the utility model Figure 3 A partial enlarged view of Figure 5 It is a side view schematic diagram of the feeding device in the embodiment of the utility model, Figure 6 It is a schematic diagram of the pushing mechanism in the embodiment of the utility model.

[0048] like Figures 1 to 6 As shown, the feeding device for screw grinding of this embodiment includes: a workbench 1, a fixing plate 2, a pushing mechanism 3, a positioning mechanism 4 and a controller.

[0049] The workbench 1 is fixedly arranged, and the fixed plate 2, the pushing mechanism 3 and the positioning mechanism 4 are respectively arranged on the table surface of the workbench 1, the fixed plate 2 and the positioning mechanism 4 are respectively located on the left and right sides of the workbench 1, and the pushing mechanism 3 is arranged between the fixed plate 2 and the positioning mechanism 4.

[0050] The fixing plate 2 is used to place the screw rod 10 .

[0051] The pushing mechanism 3 is disposed between the fixing plate 2 and the positioning mechanism 4 , and is used to push the screw rods 10 placed on the fixing plate 2 onto the positioning mechanism 4 in sequence.

[0052] The positioning mechanism 4 includes: an active roller 41, a driven roller 42, a distance measuring sensor 43 and a servo motor.

[0053] There are two active rollers 41 and two driven rollers 42, the two active rollers 41 are arranged on the active shaft 401, and the two driven rollers 42 are arranged on the driven shaft 402. The active shaft 401 and the driven shaft 402 are rotatably arranged on the workbench 1 respectively, and the active roller 41 and the driven roller 42 are arranged side by side, and the screw 10 pushed by the pushing mechanism 3 rolls onto the active roller 41 and the driven roller 42.

[0054] A servo motor (not shown) is arranged in the workbench 1 , and the servo motor is connected to the driving shaft 401 through a synchronous belt.

[0055] Two distance measuring sensors 43 are provided, and the two distance measuring sensors 43 are arranged on the workbench 1, respectively located near the starting position of the thread of the screw 10 and the straight tooth groove of the tooth back. The distance measuring sensor 43 is used to detect the starting position of the thread of the screw and the starting position of the tooth back of the screw, and send the detection signal to the controller.

[0056] The pushing mechanism 3, the distance measuring sensor 43 and the servo motor are electrically connected to the controller respectively.

[0057] In this embodiment, the screws to be polished are placed on the fixed plate in sequence under the control of the controller, and the controller controls the pushing mechanism to push the screw closest to the positioning mechanism onto the active roller and the driven roller of the positioning mechanism.

[0058] The servo motor drives the active shaft and active roller to rotate, and the active roller and driven roller cooperate to drive the screw to rotate slowly. When the screw rotates, the distance sensor detects the distance between the starting point of the screw thread and the starting point of the screw thread, and sends the detection data to the controller. When the detection data detected by the distance sensor reaches the preset range, the controller controls the servo motor to stop, the screw stops rotating, and forms a position on the active roller and driven roller for the robot to grab. After the robot grabs the screw, the screw forms a precise position on the robot. When grinding the screw thread (tooth groove), the abrasive (grinding wheel) is accurately embedded in the screw thread (tooth groove), which will not damage the screw, and the screw thread (tooth groove) and tooth back can achieve the best grinding effect.

[0059] After the manipulator grabs the screw, the pushing mechanism pushes the screw closest to the positioning mechanism onto the active roller and the driven roller of the positioning mechanism again, and the screw is positioned for the manipulator to grab.

[0060] It is not difficult to find from the above content that the feeding device for screw grinding of this embodiment is provided with a workbench, a fixed plate, a pushing mechanism, a positioning mechanism and a controller. The fixed plate, the pushing mechanism and the positioning mechanism are provided on the workbench. The positioning mechanism includes: an active roller, a driven roller, a distance sensor and a servo motor. The active roller and the driven roller are provided on the workbench through the active shaft and the driven shaft, and the servo motor is connected to the active shaft. In the feeding device for screw grinding of this embodiment, the screws to be ground are placed on the fixed plate in sequence, and the pushing mechanism pushes the screw closest to the positioning mechanism onto the active roller and the driven roller. Then the servo motor drives the active shaft and the screw to rotate, and the distance sensor detects the starting position of the screw thread by detecting the distance between the starting point of the screw thread, and sends the detection data to the controller. When the detection data detected by the distance sensor reaches the preset range, the controller controls the screw to stop rotating, and the screw is positioned on the active roller and the driven roller. After the manipulator grabs it, the screw is also accurately positioned on the manipulator, so that the screw can be smoothly ground and the screw thread will not be damaged.

[0061] Optionally, in the feeding device for screw grinding in this embodiment, a support plate 21 and a stopper 22 are provided on the fixed plate 2.

[0062] There are multiple support plates 21 , and the multiple support plates 21 are arranged on the fixing plate 2 at intervals and in parallel with each other. When the screw rod 10 is placed, it is placed on the multiple support plates 21 .

[0063] Two stoppers 22 are arranged on the fixing plate 2 at intervals, and are located outside the supporting plate 21 . A certain distance (gap) is left between the stoppers 22 and the ends of the supporting plate 21 . The stoppers 22 are used to block the screw.

[0064] The fixing plate 2 is arranged to be inclined, and the lower end of the fixing plate 2 is located at a side close to the positioning mechanism 4 .

[0065] In this embodiment, the fixed plate is arranged at an angle. After the screw is placed, the screw can roll along the fixed plate and the support plate toward one side of the positioning mechanism. The screw at the lower end (the lowest end) is blocked by the block. Multiple screws stay on the support plate in turn, and the screw at the lowest end is blocked by the block, staying in the gap between the support plate and the block, and finally pushed to the positioning mechanism by the pushing mechanism.

[0066] Furthermore, in the feeding device for screw grinding in this embodiment, a plurality of support plates 21 are arranged on the fixed plate 2 at intervals and in parallel with each other, and the two outermost support plates 21 are in a right-angled L-shape and are provided with a limit baffle 211.

[0067] When the screw is placed, it is placed on the support plate 21 and between the limit baffles 211 on both sides to prevent the screw from sliding out of the fixing plate 2 when rolling.

[0068] Furthermore, in the feeding device for screw grinding in this embodiment, a bolt groove 201 is provided on the fixing plate 2.

[0069] The support plate 21 is provided with a fixing through hole, and the fixing bolt can be slidably set in the bolt groove 201 of the fixing plate 2 and passed through the fixing through hole of the support plate 21, and then locked and fixed by a fixing nut, so that the support plate 21 is adjustably set on the fixing plate 2 to adjust the spacing between the support plates 21 to adapt to screws 10 of different length specifications.

[0070] Further, such as Figure 2 , Figure 3 and Figure 6 As shown, in the feeding device for screw grinding in this embodiment, the pushing mechanism 3 includes: a pushing block 31 and a telescopic cylinder.

[0071] The fixing plate 2 is provided with a penetrating rectangular through hole 202 at the gap between the supporting plate 21 and the stopper 22 .

[0072] The telescopic cylinder (not shown) is arranged on the workbench 1 and is electrically connected to the controller.

[0073] The push block 31 is connected to the movable rod of the telescopic cylinder, and the push block 31 is slidably arranged in the rectangular through hole 202 of the fixed plate 2. When the movable rod of the telescopic cylinder is extended, it drives the push block 31 to extend out of the rectangular through hole 202 of the fixed plate 2, and the push block 31 pushes the screw 10 that stays between the support plate 21 and the stopper 22, so that the screw slides (over) the stopper 22 and rolls onto the active roller 41 and the driven roller 42 of the positioning mechanism 4.

[0074] In this embodiment, multiple screw rods are placed on the support plate of the fixed plate and blocked by the block. The push block pushes the lowest screw rod to the positioning mechanism, and the remaining screw rods roll along the support plate in sequence, and then the lowest (lowest) screw rod is blocked by the block again. After the screw rod on the positioning mechanism is grabbed by the robot, the lowest screw rod is pushed to the positioning mechanism again, so that the screw rods are grabbed and polished in sequence.

[0075] Furthermore, in the feeding device for screw grinding in this embodiment, the top surface of the push block 31 and the top surface of the stop block 22 are both provided with inclined slopes, and the lower end of the slope is located on the side close to the positioning mechanism 4. When the telescopic cylinder drives the push block 31 to extend, the push block 31 pushes the screw, so that the screw 10 rolls onto the positioning mechanism 4 along the inclined surface of the push block 31 and the inclined surface of the stop block.

[0076] Furthermore, in the feeding device for screw grinding in this embodiment, a protruding push block 311 is provided on one side of the top of the push block 31 , and the protruding push block 311 is located on a side away from the stop block 22 .

[0077] The side of the protruding push block 311 close to the stopper 22 is an inclined surface. When the telescopic cylinder is extended, the inclined side surface of the protruding push block 311 first abuts against the circumferential side wall of the screw, pushing the screw to roll along the inclined top surface of the push block 31 onto the stopper 22, and then rolls along the inclined surface of the stopper 22 onto the positioning mechanism 4, ensuring that the screw is pushed out smoothly.

[0078] Furthermore, in the feeding device for screw grinding in this embodiment, the support plate 21 on the fixed plate 2, the limit baffle 211, the pushing block 31 of the pushing mechanism 3, and the protruding pushing block 311 on the pushing block 31 are all made of plastic.

[0079] The active roller 41 and the driven roller 42 of the positioning mechanism 4 are both covered with plastic sleeves to cushion and protect the screw rod and prevent the screw rod from being bumped and damaged during rolling.

[0080] Furthermore, in the feeding device for screw grinding in this embodiment, the positioning mechanism 4 also includes: a supporting roller 44.

[0081] The support roller 44 is arranged on the driving shaft 401 and is located between the two driving rollers 41. The circumferential side wall of the support roller 44 is provided with a protruding ring 441. When the screw is rotating, the protruding ring 441 of the support roller 44 is embedded in the tooth groove of the screw and abuts against the side wall of the screw, thereby providing better support for the screw and preventing the screw from bending and deforming.

[0082] In the present invention, unless otherwise clearly specified and limited, a first feature being “on” or “under” a second feature may mean that the first feature and the second feature are in direct contact, or the first feature and the second feature are in indirect contact via an intermediate medium.

[0083] Moreover, the first feature being “above”, “above”, and “above” the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being “below”, “below”, and “below” the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0084] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A feeding device for screw grinding, characterized in that: include: Workbench, fixing plate, pushing mechanism, positioning mechanism and controller; The fixing plate, the pushing mechanism and the positioning mechanism are arranged on the workbench; The fixing plate is used for placing the screw rod; The pushing mechanism is arranged between the fixing plate and the positioning mechanism, and is used to push the screws on the fixing plate onto the positioning mechanism in sequence; The positioning mechanism comprises: an active roller, a driven roller, a distance measuring sensor and a servo motor; The active roller and the driven roller are rotatably arranged on the workbench through a driving shaft and a driven shaft respectively, and are used to receive the screw rod; The servo motor is drivingly connected to the driving shaft and is used to drive the screw to rotate; The pushing mechanism, the servo motor and the distance measuring sensor are electrically connected to the controller respectively. The distance measuring sensor is used to detect the starting position of the screw thread and send the detection data to the controller. The controller is used to stop the rotation of the screw when the detection data reaches a preset range for the robot to grasp.

2. The feeding device for screw grinding according to claim 1, characterized in that: The fixing plate is provided with a support plate and a stopper; There are a plurality of support plates, and the plurality of support plates are arranged on the fixing plate at intervals for placing screw rods; The fixing plate is tilted so that the screw rod can be rotatably placed on the fixing plate and the supporting plate; The stopper is located at the outer side of the supporting plate and is used to stop the screw rod on the fixing plate.

3. The feeding device for screw grinding according to claim 2, characterized in that: The support plate located at the outermost side is provided with a limit baffle.

4. The feeding device for screw grinding according to claim 3, characterized in that: The fixing plate is provided with a bolt slot; The support plate is slidably arranged in the bolt groove through a fixing bolt.

5. The feeding device for screw grinding according to claim 2, characterized in that: The pushing mechanism comprises: a telescopic cylinder and a pushing block; The fixing plate is provided with a rectangular through hole at the gap between the supporting plate and the stopper; The telescopic cylinder is arranged on the workbench, the pushing block is connected to the movable rod of the telescopic cylinder and is slidably arranged in the rectangular through hole, and when the movable rod of the telescopic cylinder is extended, the pushing block is used to push the screw rod so that the screw rod slides over the stopper.

6. The feeding device for screw grinding according to claim 5, characterized in that: The top surfaces of the pushing block and the blocking block are both provided with inclined surfaces, and the lower ends of the inclined surfaces are located at a side close to the positioning mechanism.

7. The feeding device for screw grinding according to claim 6, characterized in that: A protruding push block is arranged on the top of the push block, and the side surface of the protruding push block is an inclined surface for abutting against the screw rod.

8. The feeding device for screw grinding according to claim 7, characterized in that: The support plate, the push block and the protruding push block are made of plastic; The active roller and the driven roller are both covered with plastic sleeves.

9. The feeding device for screw grinding according to any one of claims 1 to 8, characterized in that: The positioning mechanism also includes: a supporting roller; The supporting roller is arranged on the driving shaft, and a protruding ring is arranged on the circumferential side wall of the supporting roller. The protruding ring is used to be embedded in the tooth groove of the screw and to abut against the screw.

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