Servo pusher for broaching machine

Abstract

The application relates to the technical field of machine tool equipment, and provides a servo material pushing device of a broaching machine, which comprises a machine tool frame, a sliding rail and a workpiece mounting seat, the workpiece mounting seat is provided with a first matching seat, the two sides of the workpiece mounting seat are respectively provided with a first workpiece fixing plate and a second workpiece fixing plate, the first matching seat is provided with an internal thread hole, one side of the machine tool frame is provided with an upper and lower feeding position, and the machine tool frame has a working position; a lifting driving mechanism is arranged at the lower end of the lifting driving mechanism; a first servo motor and a first lead screw, the first servo motor can drive the workpiece mounting seat to slide in the length direction of the sliding rail, so that the first workpiece fixing plate and the second workpiece fixing plate reciprocate between the upper and lower feeding position and the working position, the servo material pushing device of the broaching machine improves the pushing precision, and also improves the workpiece machining quality and production efficiency.

Description

Technical Field

[0001] This application relates to the field of machine tool equipment technology, and more specifically, to a servo pusher device for a broaching machine. Background Technology

[0002] The pin gear housing is a core component of RV reducers and cycloidal pinwheel reducers. Its inner wall has precision toothed grooves to accommodate the pin gear pins, which mesh with the cycloidal wheel to achieve speed reduction. The tooth profile accuracy, cumulative pitch error, and surface roughness requirements of the inner gear ring of the pin gear housing are extremely high, typically at the micrometer level, directly determining the reducer's transmission accuracy, backlash, noise, and service life. As one of the most difficult workpieces to machine, the machining accuracy of the pin gear housing has always been a technological challenge for manufacturers of RV reducers.

[0003] Broaching is one of the main machining methods for the internal gear rings of RV reducer housings. Broaching uses a multi-tooth cutting tool (broach) to cut along a straight path. Each tooth on the broach removes a layer of metal in sequence, and the final tooth shape can be completed in one stroke. It has the advantages of high precision, high efficiency, and good surface quality. Currently, spiral broaching machines and mechanical-electric servo broaching machines have been applied to the machining of the internal gear grooves of RV reducer housings.

[0004] In existing broaching equipment, workpiece pushing is generally achieved using a hydraulic cylinder drive, where the hydraulic cylinder pushes the workpiece holder, causing it to reciprocate between the loading / unloading position and the broaching work position. However, hydraulic pushing systems have several shortcomings in practical applications. First, a hydraulic system is a complex electromechanical-hydraulic integrated system. Due to the complexity of its structure and working principle, it is often difficult to quickly and accurately pinpoint the source of a fault once it occurs. Second, hydraulic systems are prone to vibration and creep under alternating loads, leading to unstable operation of the workpiece holder during pushing, which in turn affects the dimensional accuracy and surface quality of subsequent broaching. Furthermore, the inherent response lag of the hydraulic system also affects the real-time control accuracy of the pushing. More importantly, the pushing speed of the hydraulic cylinder is relatively slow, and the pushing accuracy is affected by various factors such as oil temperature, system leakage, and pressure fluctuations, making precise displacement and speed control difficult to achieve. This directly restricts further improvements in the machining accuracy and efficiency of the internal gears of the pinion gear housing. Summary of the Invention

[0005] In view of this, this application provides a servo pushing device for a broaching machine to solve the technical problems of poor accuracy and low pushing efficiency of existing hydraulic broaching machine pushing devices.

[0006] This application provides a servo-driven feeding device for a broaching machine, wherein the servo-driven feeding device for the broaching machine includes: The machine tool frame includes a slide rail mounted on the machine tool frame and a workpiece mounting seat slidably mounted on the slide rail. The workpiece mounting seat is provided with a first mating seat. A first workpiece fixing plate and a second workpiece fixing plate are respectively provided on both sides of the workpiece mounting seat along the length direction of the slide rail. Both the first workpiece fixing plate and the second workpiece fixing plate have workpiece limiting holes. The first mating seat has an internal threaded hole. The machine tool frame is provided with loading and unloading positions on one side of the slide rail along the length direction. The machine tool frame has a working position. A lifting drive mechanism is mounted on the machine tool frame, and a broaching tool is mounted at the lower end of the lifting drive mechanism, with the broaching tool pointing downward toward the working position. A first servo motor and a first lead screw connected to the output shaft of the first servo motor, the first lead screw being threaded into the internal thread hole of the first mating seat, the first servo motor being able to drive the workpiece mounting seat to slide along the length direction of the slide rail, so that the first workpiece fixing plate and the second workpiece fixing plate reciprocate between the loading / unloading position and the working position.

[0007] Furthermore, the lifting drive mechanism is a lifting hydraulic cylinder, the piston rod of the lifting hydraulic cylinder is connected to an auxiliary slide, an auxiliary tool holder is connected to the auxiliary slide, and the broaching tool is connected to the auxiliary tool holder.

[0008] Furthermore, the workpiece limiting holes on the first workpiece fixing plate and the workpiece limiting holes on the second workpiece fixing plate can be adapted to positioning fixtures for different workpieces.

[0009] Furthermore, the number of slide rails is 2, and the two slide rails are arranged in parallel and spaced apart. The lower ends of both sides of the workpiece mounting base along the width direction of the slide rails are respectively supported on the two slide rails. The first workpiece fixing plate and the second workpiece fixing plate are fixed below the workpiece mounting base and located between the two slide rails.

[0010] Furthermore, the workpiece mounting base includes a primary mounting base and a secondary mounting base that are separate from each other. The first workpiece fixing plate is disposed on the primary mounting base, and the second workpiece fixing plate is disposed on the secondary mounting base. The secondary mounting base is provided with a second mating seat, and the first mating seat is disposed on the secondary mounting base. The second mating seat has an internal threaded hole. The primary mounting base is provided with a second servo motor, and the output shaft of the second servo motor is connected to a second lead screw. The second lead screw is threadedly engaged with the internal threaded hole of the second mating seat.

[0011] Furthermore, the servo pushing device of the broaching machine includes a fixing mechanism, which can fix the primary mounting seat and the secondary mounting seat to each other when they are close together.

[0012] Furthermore, the fixing mechanism includes a first magnetic member disposed on the primary mounting base and a second magnetic member disposed on the secondary mounting base. When the primary mounting base and the secondary mounting base are close to each other, the first magnetic member and the second magnetic member are magnetically attracted to each other.

[0013] Further, the fixing mechanism includes a first upper protruding edge, a second upper protruding edge, a clamping frame, and a clamping frame lowering trigger mechanism. The first upper protruding edge is disposed on the upper surface of the primary mounting base and located on the edge of the primary mounting base adjacent to the secondary mounting base. The second upper protruding edge is disposed on the upper surface of the secondary mounting base and located on the edge of the secondary mounting base adjacent to the secondary mounting base. The clamping frame is vertically and elliptably mounted on the primary mounting base, and the lower end of the clamping frame has a clamping groove. The clamping frame lowering trigger mechanism is disposed on the secondary mounting base. When the distance between the primary mounting base and the secondary mounting base is greater than a predetermined distance, the clamping frame lowering trigger mechanism engages with the secondary mounting base. When the clamping frame is separated and in the non-clamping position, the lower end of the clamping groove is higher than the first and second upper protrusions. During the process of the distance between the primary mounting base and the secondary mounting base being less than or equal to the predetermined distance and approaching each other so that the primary mounting base and the secondary mounting base are in contact with each other, the clamping frame descent trigger mechanism contacts the clamping frame and drives the clamping frame to descend. When the primary mounting base and the secondary mounting base are in contact with each other, the clamping frame is driven to the clamping position by the clamping frame descent trigger mechanism. In the clamping position, the lower end of the clamping groove is lower than the upper surface of the first and second upper protrusions and clamps the first and second upper protrusions.

[0014] Furthermore, the fixing mechanism also includes a vertical slide groove disposed on the primary mounting base. The clamping frame is connected to a slide rod that can slide vertically and is limited in the vertical slide groove. The slide rod is elastically engaged with the vertical slide groove through an elastic element. The clamping frame has a first wedge surface on the clamping frame descent triggering mechanism. The clamping frame descent triggering mechanism is a trigger rod with a second wedge surface. When the distance between the primary mounting base and the secondary mounting base is greater than a predetermined distance, the clamping frame is held in the non-clamping position under the action of the elastic element. When the distance between the primary mounting base and the secondary mounting base is less than or equal to the predetermined distance and they approach each other to make the primary mounting base and the secondary mounting base abut against each other, the trigger rod wedges with the first wedge surface through the second wedge surface to press the clamping frame down to the clamping position.

[0015] Furthermore, the lower end of the clamping frame is provided with a base plate and a first upright plate and a second upright plate connected to both sides of the base plate. The clamping groove is formed in the area between the first upright plate and the second upright plate below the base plate. The first upright plate forms a first vertical surface facing the second upright plate. The second upright plate forms a second vertical surface and an inclined outward expansion surface in sequence facing the first vertical surface. The inclined outward expansion surface extends downward away from the first vertical surface. At the clamping position, the first upper convex edge and the second upper convex edge are clamped between the first vertical surface and the second vertical surface.

[0016] The servo-driven feeding device for a broaching machine provided in this application has the following advantages: The servo pusher device for the broaching machine provided in this application allows the workpiece mounting seat to slide to the loading / unloading position when workpiece processing is required. The operator loads the workpiece into the positioning fixture, which is fixed to the limiting holes of the first workpiece fixing plate and / or the second workpiece fixing plate. Subsequently, the first servo motor drives the workpiece mounting seat to the working position. When the workpiece on the first workpiece fixing plate is aligned with the broaching tool, the lifting drive mechanism drives the broaching tool downward to feed the tool. After the broaching tool is clamped, the pusher device drives the entire workpiece upward to perform broaching processing. After processing is completed, the first servo motor drives the workpiece mounting seat to the loading / unloading position, and the operator loads and unloads the workpiece. Compared with hydraulic drive, the first servo motor, combined with the first lead screw transmission, can achieve precise position control, programmable adjustment of the pushing speed, and smooth movement without crawling. It fundamentally overcomes the accuracy fluctuations caused by factors such as oil temperature and leakage in hydraulic systems, improving both pushing accuracy and workpiece processing quality and production efficiency. The device is particularly suitable for precision internal gear machining with stringent requirements, such as pin tooth housings, and can significantly improve yield and product processing efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional schematic diagram of a portion of the structure of a servo pusher device for a broaching machine according to an embodiment of this application. Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 for Figure 1 Enlarged view of point B in the middle; Figure 4 Another perspective view of a portion of the structure of the servo pusher device of a broaching machine according to an embodiment of this application; Figure 5 for Figure 4 Enlarged view of point C in the middle; Figure 6 This is a perspective view of a portion of the structure of a servo-driven feeding device for a broaching machine according to another embodiment of this application; Figure 7 This is a perspective view of a portion of the structure of the servo pusher device of a broaching machine according to another embodiment of this application; Figure 8 for Figure 7 Enlarged view of point D in the middle; Figure 9 This is a partial schematic diagram of the servo pusher device of a broaching machine according to another embodiment of this application; Figure 10 for Figure 9 Enlarged view of point E in the middle.

[0019] Explanation of reference numerals in the attached figures: 1-Slide rail; 2-First mating seat; 3-First workpiece fixing plate; 4-Second workpiece fixing plate; 5-Workpiece limiting hole; 6-Lifting hydraulic cylinder; 7-Auxiliary slide; 8-Auxiliary tool holder; 9-Broaching tool; 10-First servo motor; 11-First lead screw; 12-Reducer pin gear housing; 13-Second mating seat; 14-Second servo motor; 15-Second lead screw; 16-First upper convex edge; 17-Second upper convex edge; 18-Vertical slide groove; 19-Slide rod; 20-Elastic element; 21-Reducer; 100-Machine tool frame; 101-Slide rail mounting plate; 102-Vertical guide column; 200-Workpiece mounting seat; 201-First-stage mounting seat; 202-Second-stage mounting seat; 300-Clamping frame; 301-Clamping groove; 302-First wedge surface; 303-Base plate; 304-First vertical plate; 305-Second vertical plate; 306-First vertical surface; 307-Second vertical surface; 308-Inclined outward expansion surface; 400-Trigger rod; 401-Second wedge surface. Detailed Implementation

[0020] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. One or more embodiments of this application are exemplarily shown in the drawings to provide a more accurate and thorough understanding of the technical solutions disclosed herein. However, it should be understood that this application can be implemented in many different forms and is not limited to the embodiments described below.

[0021] In the accompanying drawings of this application, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0022] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously.

[0023] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0024] See Figures 1 to 5 This application provides a servo feeding device for a broaching machine, wherein the servo feeding device for the broaching machine includes: The machine tool frame 100 includes a slide rail 1 mounted on the machine tool frame 100 and a workpiece mounting seat 200 slidably mounted on the slide rail 1. The workpiece mounting seat 200 has a first mating seat 2. A first workpiece fixing plate 3 and a second workpiece fixing plate 4 are respectively provided on both sides of the workpiece mounting seat 200 along the length direction of the slide rail 1. Both the first workpiece fixing plate 3 and the second workpiece fixing plate 4 have workpiece limiting holes 5. The first mating seat 2 has an internal threaded hole. A loading / unloading position is provided on one side of the slide rail 1 along its length direction. The machine tool frame 100 also has a working position. The machine tool frame 100 serves as the basic support structure for the entire broaching machine. The slide rail 1 is laid on the slide rail mounting plate 101 on the machine tool frame 100, providing precise horizontal guidance for the workpiece mounting seat 200. The bottom of the workpiece mounting seat 200 has a slider that matches the slide rail 1, allowing it to slide smoothly along the slide rail 1. A lifting drive mechanism is installed on the machine tool frame 100, and a broaching tool 9 is installed at the lower end of the lifting drive mechanism, with the broaching tool 9 facing downward toward the working position; The first servo motor 10 and the first lead screw 11 connected to the output shaft of the first servo motor 10 are threaded together with the internal thread hole of the first mating seat 2. The first servo motor 10 can drive the workpiece mounting seat 200 to slide along the length direction of the slide rail 1 so that the first workpiece fixing plate 3 and the second workpiece fixing plate 4 can move back and forth between the loading and unloading position and the working position. In addition, the first servo motor 10 can be connected to the first lead screw 11 through the reducer 21.

[0025] When the broaching machine servo pusher device provided in this application needs to process a workpiece (e.g., the reducer pin gear housing 12), the workpiece mounting base 200 slides to the loading / unloading position. The operator loads the workpiece into the positioning fixture, which is fixed to the limiting holes 5 of the first workpiece fixing plate 3 and / or the second workpiece fixing plate 4. Subsequently, the first servo motor 10 drives the workpiece mounting base 200 to the working position. When the workpiece on the first workpiece fixing plate 3 is aligned with the broaching tool 9, the lifting drive mechanism drives the broaching tool 9 downward to achieve tool feeding. After the broaching tool 9 is clamped, the pusher device drives the workpiece 12 to move upward as a whole for broaching processing. After processing is completed, the first servo motor 10 drives the workpiece mounting base 200 to the loading / unloading position, and the operator loads and unloads the workpiece. Compared with hydraulic drive, the first servo motor 10, in conjunction with the first lead screw 11, can achieve precise position control, programmable adjustment of the pushing speed, and smooth movement without crawling. This fundamentally overcomes the accuracy fluctuations caused by factors such as oil temperature and leakage in hydraulic systems, improving both pushing accuracy and workpiece processing quality and production efficiency.

[0026] According to one embodiment of this application, the lifting drive mechanism is a lifting hydraulic cylinder 6. The piston rod of the lifting hydraulic cylinder 6 is connected to an auxiliary slide plate 7. A vertical guide column 102 is also provided on the machine tool frame 100. The auxiliary slide plate 7 can slide vertically and cooperate with the vertical guide column 102. An auxiliary tool holder 8 is connected to the auxiliary slide plate 7, and a broaching tool 9 is connected to the auxiliary tool holder 8.

[0027] According to one embodiment of this application, the workpiece limiting hole 5 on the first workpiece fixing plate 3 and the workpiece limiting hole 5 on the second workpiece fixing plate 4 can be adapted to positioning fixtures for different workpieces, such as a reducer pin tooth housing 12. This allows the servo pusher of the broaching machine to be used for machining the reducer pin tooth housing 12, but it can also be used for machining other adapted workpieces. The workpiece limiting hole 5 is set as a positioning hole that matches the outer contour of different positioning fixtures.

[0028] According to a specific embodiment of this application, the number of slide rails 1 is 2, and the two slide rails 1 are arranged in parallel and spaced apart. The lower ends of both sides of the workpiece mounting base 200 along the width direction of the slide rails 1 are respectively supported on the two slide rails 1. The first workpiece fixing plate 3 and the second workpiece fixing plate 4 are fixed below the workpiece mounting base 200 and located between the two slide rails 1.

[0029] See Figure 6 According to a preferred embodiment of this application, the workpiece mounting base 200 includes a primary mounting base 201 and a secondary mounting base 202, which are separated from each other. A first workpiece fixing plate 3 is disposed on the primary mounting base 201, and a second workpiece fixing plate 4 is disposed on the secondary mounting base 202. A second mating seat 13 is disposed on the secondary mounting base 202, and a first mating seat 2 is disposed on the secondary mounting base 202. The second mating seat 13 has an internal threaded hole. A second servo motor 14 is disposed on the primary mounting base 201. The output shaft of the second servo motor 14 is connected to a second lead screw 15. The second lead screw 15 is threadedly engaged with the internal threaded hole of the second mating seat 13. The servo motor 14 can independently drive the secondary mounting base 202 to move relative to the primary mounting base 201 along the slide rail 1, thereby realizing the secondary extension of the second mating base 13. This avoids the phenomenon of excessive component length caused by using only one motor screw structure (first servo motor 10, first screw 11), and can reduce the overall space occupied by the servo pusher of the broaching machine. Moreover, by setting the primary mounting base 201 and the secondary mounting base 202, they can move relatively far apart, so that when the first workpiece fixing plate 3 is in the loading and unloading position, the second workpiece fixing plate 4 will not be in the working position, thus avoiding the workpiece on the second workpiece fixing plate 4 being scratched by the broaching tool.

[0030] See Figures 7 to 10 According to one embodiment of this application, the servo pusher of the broaching machine includes a fixing mechanism. When the primary mounting base 201 and the secondary mounting base 202 are close to each other, the fixing structure can fix the primary mounting base 201 and the secondary mounting base 202 to each other. When the primary mounting base 201 and the secondary mounting base 202 are close to each other and are driven as a whole by the first servo motor 10 and the first lead screw 11, the second lead screw 15 plays a role in connecting and fixing the primary mounting base 201 and the secondary mounting base 202. Adding the fixing structure can alleviate the tension on the second lead screw 15 and improve the stability of the primary mounting base 201 and the secondary mounting base 202 as a whole when driven by the first servo motor 10 and the first lead screw 11. Although the second lead screw 15 itself also plays a role in connecting and fixing the primary mounting base 201 and the secondary mounting base 202, if the huge axial cutting force generated during broaching is entirely borne by the second lead screw 15, long-term use will cause wear and a decrease in accuracy of the lead screw pair. With the addition of the fixing mechanism, the axial force during machining is mainly transmitted by the fixing mechanism, which effectively alleviates the tension or pressure on the second lead screw 15 and protects the accuracy and life of the lead screw pair. At the same time, the rigid connection provided by the fixing mechanism further improves the stability of the first-stage mounting base 201 and the second-stage mounting base 202 as a whole when driven by the first servo motor 10 and the first lead screw 11, ensuring the repeatability accuracy of workpiece positioning and machining quality.

[0031] According to one embodiment of this application, the fixing mechanism includes a first magnetic member disposed on a primary mounting base 201 and a second magnetic member disposed on a secondary mounting base 202. When the primary mounting base 201 and the secondary mounting base 202 are close to each other, the first magnetic member and the second magnetic member are magnetically attracted to each other.

[0032] According to another embodiment of this application, the fixing mechanism includes a first upper protruding edge 16, a second upper protruding edge 17, a clamping frame 300, and a clamping frame descent triggering mechanism. The first upper protruding edge 16 is disposed on the upper surface of the primary mounting base 201 and located on the edge of the primary mounting base 201 adjacent to the secondary mounting base 202. The second upper protruding edge 17 is disposed on the upper surface of the secondary mounting base 202 and located on the edge of the secondary mounting base 202 adjacent to the secondary mounting base 202. The clamping frame 300 is vertically and elliptically mounted on the primary mounting base 201, and the lower end of the clamping frame 300 has a clamping groove 301. The clamping frame descent triggering mechanism is disposed on the secondary mounting base 202. When the distance between the primary mounting base 201 and the secondary mounting base 202 is greater than a predetermined distance, the clamping frame descent triggering mechanism separates from the clamping frame 300, and the clamping frame 300 is in a position where... In the non-clamping position, the lower end of the clamping groove 301 is higher than the first upper protrusion 16 and the second upper protrusion 17. During the process of the distance between the primary mounting base 201 and the secondary mounting base 202 being less than or equal to a predetermined distance and approaching each other so that the primary mounting base 201 and the secondary mounting base 202 are close to each other, the clamping frame descent trigger mechanism contacts the clamping frame 300 and drives the clamping frame 300 to descend. When the primary mounting base 201 and the secondary mounting base 202 are close to each other, the clamping frame 300 is driven to the clamping position by the clamping frame descent trigger mechanism. In the clamping position, the lower end of the clamping groove 301 is lower than the upper surface of the first upper protrusion 16 and the second upper protrusion 17 and clamps the first upper protrusion 16 and the second upper protrusion 17. This mechanical automatic locking scheme has an ingenious structure, high reliability, and convenient maintenance, and does not require additional electric, pneumatic or hydraulic driving force.

[0033] According to a specific embodiment of this application, the fixing mechanism further includes a vertical slide groove 18 disposed on the primary mounting base 201. A clamping frame 300 is connected to a slide rod 19 that is vertically slidably limited within the vertical slide groove 18. The slide rod 19 elastically engages with the vertical slide groove 18 via an elastic element 20. The clamping frame 300 has a first wedge surface 302 facing the clamping frame descent triggering mechanism. The clamping frame descent triggering mechanism is a trigger rod 400 with a second wedge surface 401. When the distance between the primary mounting base 201 and the secondary mounting base 202 is greater than a predetermined distance, the clamping frame 302 remains in a non-clamping position under the action of the elastic element 20. During the process where the distance between the primary mounting bases 202 is less than or equal to a predetermined distance and they approach each other so that the primary mounting base 201 and the secondary mounting base 202 are in contact with each other, the trigger rod 400 engages with the first wedge surface 302 through the second wedge surface 401 to press the clamping frame 300 down to the clamping position. The elastic element 20 is, for example, a spring. The lower end of the spring can be connected to the primary mounting base 201, and the upper end of the spring can be connected to the lower end of the slide rod 19. In this case, the spring is a compression spring. Alternatively, a slide cover plate is provided at the upper end of the vertical slide groove 18, the upper end of the spring is connected to the lower end of the slide cover plate, and the lower end of the spring is connected to the upper end of the slide rod 19. In this case, the spring is a tension spring.

[0034] In this embodiment, the trigger rod 400 can be mounted on the first mating seat 2. The front end of the trigger rod 400 is provided with a second wedge surface 401 that matches the first wedge surface 302. When the secondary mounting seat 202 approaches the primary mounting seat 201 horizontally, the second wedge surface 401 of the trigger rod 400 first contacts the first wedge surface 302 of the clamping frame 300, forming a wedge fit. As the secondary mounting seat 202 continues to advance, under the action of the wedge effect, the trigger rod 400 gradually presses the clamping frame 300 downward, causing the clamping frame 300 to descend smoothly to the clamping position. The wedge fit makes the downward pressing process of the clamping frame 300 smooth and stable, converting horizontal movement into vertical movement, with reasonable force distribution and no impact. When the secondary mounting seat 202 retracts after processing, the trigger rod 400 gradually disengages from the clamping frame 300, and the clamping frame 300 automatically rises under the restoring force of the elastic element 20, returning to the non-clamping position, releasing the clamping of the first upper protrusion 16 and the second upper protrusion 17.

[0035] According to one embodiment of this application, the lower end of the clamping frame 300 is provided with a base plate 303 and a first upright plate 304 and a second upright plate 305 connected to both sides of the base plate 303. A clamping groove 301 is formed in the area below the base plate 303 between the first upright plate 304 and the second upright plate 305. The first upright plate 304 forms a first vertical surface 306 facing the second upright plate 305. The second upright plate 305 forms a second vertical surface 307 and an inclined outward expansion surface 308 in sequence facing the first vertical surface 306. The inclined outward expansion surface 308 extends downward away from the first vertical surface 306. In the clamping position, the first upper protrusion 16 and the second upper protrusion 17 are clamped between the first vertical surface 306 and the second vertical surface 307.

[0036] When the primary mounting base 201 and the secondary mounting base 202 are in contact with each other, the clamping frame 300 descends. The clamping groove 301 not only moves vertically downwards relative to the first upper protruding edge 16 and the second upper protruding edge 17, but also, because the clamping frame 300 is mounted on the primary mounting base 201 and the second upper protruding edge 17 is mounted on the secondary mounting base 202, there is also a horizontal relative movement between the clamping groove 301 and the second upper protruding edge 17. Under this complex motion trajectory, if the second vertical plate 305 is entirely vertical, the second upper protruding edge 17 is highly likely to collide or interfere with the lower edge of the second vertical plate 305 during its entry into the clamping groove 301. Interference can cause the clamping action to jam or even damage the components. However, in this embodiment, the inclined outward expansion surface 308 provided on the second vertical plate 305 provides an outwardly expanding guide area. When the second upper protruding edge 17 enters the clamping groove 301, it first contacts the inclined outward expansion surface 308 and is smoothly guided by the inclined surface into the second vertical surface 307, avoiding the interference problem between the second vertical plate 305 and the second upper protruding edge 17. Furthermore, through the parallel first vertical surface 306 and the second vertical surface 307, the first upper protruding edge 16 and the second upper protruding edge 17 are finally clamped and limited precisely and stably between the first vertical plate 304 and the second vertical plate 305.

[0037] It should be noted that the above embodiments only illustrate preferred embodiments of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting this application. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of this application, such as combining different features in various embodiments, and these should all fall within the protection scope of this application.

Claims

1. A servo-driven feeding device for a broaching machine, characterized in that, The servo-driven feeding device of the broaching machine includes: The machine tool frame includes a slide rail mounted on the machine tool frame and a workpiece mounting seat slidably mounted on the slide rail. The workpiece mounting seat is provided with a first mating seat. A first workpiece fixing plate and a second workpiece fixing plate are respectively provided on both sides of the workpiece mounting seat along the length direction of the slide rail. Both the first workpiece fixing plate and the second workpiece fixing plate have workpiece limiting holes. The first mating seat has an internal threaded hole. The machine tool frame is provided with loading and unloading positions on one side of the slide rail along the length direction. The machine tool frame has a working position. A lifting drive mechanism is mounted on the machine tool frame, and a broaching tool is mounted at the lower end of the lifting drive mechanism, with the broaching tool pointing downward toward the working position. A first servo motor and a first lead screw connected to the output shaft of the first servo motor, the first lead screw being threaded into the internal thread hole of the first mating seat, the first servo motor being able to drive the workpiece mounting seat to slide along the length direction of the slide rail, so that the first workpiece fixing plate and the second workpiece fixing plate reciprocate between the loading / unloading position and the working position.

2. The servo-driven feeding device for a broaching machine according to claim 1, characterized in that, The lifting drive mechanism is a lifting hydraulic cylinder. The piston rod of the lifting hydraulic cylinder is connected to an auxiliary slide plate, and an auxiliary tool holder is connected to the auxiliary slide plate. The broaching tool is connected to the auxiliary tool holder.

3. The servo-driven feeding device for a broaching machine according to claim 1, characterized in that, The workpiece limiting holes on the first workpiece fixing plate and the workpiece limiting holes on the second workpiece fixing plate can be adapted to positioning fixtures for different workpieces.

4. The servo-driven feeding device for a broaching machine according to claim 1, characterized in that, The number of slide rails is 2, and the two slide rails are arranged in parallel and spaced apart. The lower ends of both sides of the workpiece mounting base along the width direction of the slide rails are respectively supported on the two slide rails. The first workpiece fixing plate and the second workpiece fixing plate are fixed below the workpiece mounting base and located between the two slide rails.

5. The servo-driven feeding device for a broaching machine according to any one of claims 1 to 4, characterized in that, The workpiece mounting base includes a primary mounting base and a secondary mounting base that are separate from each other. The first workpiece fixing plate is disposed on the primary mounting base, and the second workpiece fixing plate is disposed on the secondary mounting base. The secondary mounting base is provided with a second mating seat, and the first mating seat is disposed on the secondary mounting base. The second mating seat has an internal threaded hole. The primary mounting base is provided with a second servo motor, and the output shaft of the second servo motor is connected to a second lead screw. The second lead screw is threadedly engaged with the internal threaded hole of the second mating seat.

6. The servo-driven feeding device for a broaching machine according to claim 5, characterized in that, The servo pusher of the broaching machine includes a fixing mechanism. When the primary mounting base and the secondary mounting base are in contact with each other, the fixing mechanism can fix the primary mounting base and the secondary mounting base to each other.

7. The servo-driven feeding device for a broaching machine according to claim 6, characterized in that, The fixing mechanism includes a first magnetic member disposed on the primary mounting base and a second magnetic member disposed on the secondary mounting base. When the primary mounting base and the secondary mounting base are close to each other, the first magnetic member and the second magnetic member are magnetically attracted to each other.

8. The servo-driven feeding device for a broaching machine according to claim 6, characterized in that, The fixing mechanism includes a first upper protruding edge, a second upper protruding edge, a clamping frame, and a clamping frame lowering trigger mechanism. The first upper protruding edge is disposed on the upper surface of the primary mounting base and located on the edge of the primary mounting base adjacent to the secondary mounting base. The second upper protruding edge is disposed on the upper surface of the secondary mounting base and located on the edge of the secondary mounting base adjacent to the secondary mounting base. The clamping frame is vertically and elliptably mounted on the primary mounting base, and the lower end of the clamping frame has a clamping groove. The clamping frame lowering trigger mechanism is disposed on the secondary mounting base. When the distance between the primary mounting base and the secondary mounting base is greater than a predetermined distance, the clamping frame lowering trigger mechanism engages with the clamping frame. When the holder is separated and the clamping frame is in the non-clamping position, the lower end of the clamping groove is higher than the first and second upper protrusions. During the process of the distance between the primary mounting base and the secondary mounting base being less than or equal to the predetermined distance and approaching each other so that the primary mounting base and the secondary mounting base are in contact with each other, the clamping frame descent trigger mechanism contacts the clamping frame and drives the clamping frame to descend. When the primary mounting base and the secondary mounting base are in contact with each other, the clamping frame is driven to the clamping position by the clamping frame descent trigger mechanism. In the clamping position, the lower end of the clamping groove is lower than the upper surface of the first and second upper protrusions and clamps the first and second upper protrusions.

9. The servo-driven feeding device for a broaching machine according to claim 8, characterized in that, The fixing mechanism further includes a vertical slide groove disposed on the primary mounting base. The clamping frame is connected to a slide rod that is vertically slidably limited in the vertical slide groove. The slide rod is elastically engaged with the vertical slide groove through an elastic element. The clamping frame has a first wedge surface on the clamping frame descent triggering mechanism. The clamping frame descent triggering mechanism is a trigger rod with a second wedge surface. When the distance between the primary mounting base and the secondary mounting base is greater than a predetermined distance, the clamping frame is held in the non-clamping position under the action of the elastic element. When the distance between the primary mounting base and the secondary mounting base is less than or equal to the predetermined distance and they approach each other until the primary mounting base and the secondary mounting base are in contact with each other, the trigger rod engages with the first wedge surface through the second wedge surface to press the clamping frame down to the clamping position.

10. The servo-driven feeding device for a broaching machine according to claim 8, characterized in that, The lower end of the clamping frame is provided with a base plate and a first upright plate and a second upright plate connected to both sides of the base plate. The clamping groove is formed in the area between the first upright plate and the second upright plate below the base plate. The first upright plate forms a first vertical surface facing the second upright plate. The second upright plate forms a second vertical surface and an inclined outward expansion surface in sequence facing the first vertical surface. The inclined outward expansion surface extends downward away from the first vertical surface. At the clamping position, the first upper convex edge and the second upper convex edge are clamped between the first vertical surface and the second vertical surface.

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