WO2022121812A1 - String twisting head device, and string automatic processing apparatus using same - Google Patents

Abstract

A string twisting head device, comprising a twisting mechanism (1) and a string crossing and looping mechanism (4). The twisting mechanism (1) comprises a twisting head assembly (11); the twisting head assembly (11) comprises a twisting rod (111) and a string hanging pin (113); the string crossing and looping mechanism (4) comprises a crossing and looping head (42); a looping rod (45) is provided on the crossing and looping head (42); a string bearing inclined surface (A1) is provided at a front end portion of the twisting rod (111); the string hanging pin (113) is provided in the string bearing inclined surface (A1); a protruding inclined stepped surface (A2) is provided at the part of the string bearing inclined surface (A1) close to a string line (X); a side vertical surface (A3) is provided at the high end of the inclined stepped surface (A2); after the looping head (42) is lowered and abuts against the string line (X), the bottom surface of the looping head (42), the side vertical surface (A3) at the high end of the inclined stepped surface (A2), the string bearing inclined surface (A1), and the outer circumferential surface of the string hanging pin (113) form a closed space surrounded on four sides; the string line (X) is confined inside the closed space. A string automatic processing apparatus using the string twisting head device. The device can improve the precision and the efficiency of string twisting, thereby improving the yield and the stability of the string.

Description

String head screwing device and automatic string processing equipment using the same technical field

The invention belongs to the technical field of string processing, and in particular relates to a string head screwing device and automatic string processing equipment using the device.

Background technique

The sound of the piano depends on the hammers hitting the strings, causing the strings to vibrate and emit sound waves. The strings are the most important components that determine the sound of the piano, and the amplitude of the strings depends on the string length, string tension, and string density. The strings are made of high-strength and high-elasticity special steel, cut to length, twisted with twist-shaped heads at both ends, and then fixed on the pegs to generate tension through the pegs. The head twisting of the strings is completed through the steps of cross looping, winding, winding, and tail removal. The cross looping function is a key prerequisite for completing the winding, winding, and tail removal, and its reliability requires a high degree of reliability. .

At present, there is a fully automatic head-twisting machine for piano string head-twisting, which realizes full automation of each step. However, in the actual use process, there are faults such as slack winding, large pitch, or frequent falling off and falling strings. question. After analysis and judgment, the reliability of the cross looping step is too low, which is the root cause of the subsequent series of problems.

technical problem

The technical problem to be solved by the present invention is to provide a string head screwing device and automatic string processing equipment using the device, so as to improve the quality and efficiency of string head screwing.

technical solutions

The present invention is achieved in this way, and provides a string head screwing device, comprising a head screwing mechanism for performing head screwing processing on the front section of a string wire, and a string for processing the strings of the strings and assisting the head screw processing. A cross looping mechanism, the head screwing mechanism includes a head screw head assembly, the head screw head assembly includes a head screw rod and a string peg, the string cross looping mechanism includes a cross looping head, and the cross looping head is used in the cross looping head. A looping rod is arranged on the ring head, a string bearing slope is set at the front end of the head twisting rod, and the string stud is arranged in the string bearing slope, and the axis of the string stud and the axis of the head twisting rod are vertically aligned. The projected angle in the vertical direction is an acute angle θ, and a raised inclined stepped surface is arranged at the position of the string bearing inclined surface close to the string line. A side elevation perpendicular to the string bearing slope is set. After the looping head descends and presses against the string line, the bottom surface of the looping head, the high-end side elevation of the inclined step surface, the string bearing slope and the hanging string The outer circumferential surface of the peg forms an enclosed space surrounded on all sides, and the strings are confined within the enclosed space.

Further, the head screwing head assembly also includes a string support plate and a string pin cylinder, the string support plate is installed on the top surface of the head screw rod to play the role of holding up the strings, and the string pin cylinder is fixed on the head screw. At the front end of the rod, the chord pin is fixed on the cylinder rod of the chord pin cylinder. When the cylinder rod of the chord pin cylinder is pushed out, the chord pin is higher than the plane where the chord plate is located. When the cylinder rod of the cylinder is retracted, the top end of the chord pin is not higher than the plane where the chord plate is located.

Further, the head screwing mechanism further comprises a head screw drive assembly and a head screw base, the head screw base is fixed on the ground and is parallel to the string line, and the head screw drive assembly is arranged on the head screw base, The head screwing head assembly is arranged on the head screwing driving assembly, and the head screwing driving assembly drives the head screwing rod to rotate.

Further, the root of the chord nail is located on the rotation axis of the head screw rod, and the included angle of the projection of the axis of the head screw rod and the axis of the front string clamping mechanism in the horizontal direction is an obtuse angle.

Further, the head screw drive assembly includes a rotating shaft, a shaft box, a head screw rotary drive servo reducer motor, and a head screw linear movement assembly that drives the head screw box to move linearly, the rotation shaft box is fixed on the head screw base, the The head screw head assembly is arranged on the rotating shaft, the head screw rod is fixed on the rotating shaft by bolts and rotates synchronously with the rotating shaft, and the head screw rotation drives the servo deceleration motor to drive the rotating shaft to rotate through the rotating shaft box.

Further, the head screwing mechanism also includes a head screw linear movement drive servo deceleration motor and a gas-electric slip ring, the head screw head assembly and the string line are at an obtuse angle greater than 90° and less than 180°, and the head screw straight line is formed by the head screw. The mobile drive is driven by a servo geared motor that slides on the head screw linear movement assembly.

Further, the rotating shaft box includes a box body, a main shaft, an input shaft, an input gear and a main shaft gear, the head screw linear moving assembly includes a ball screw and a head screw drive servo motor, and the box body is installed on the bottom of the nut through a nut. It is connected with the ball screw of the head screw linear movement assembly, and the head screw drive servo motor of the head screw linear movement assembly drives the overall movement, the head screw rotation drives the servo deceleration motor to drive the input shaft, and the input shaft drives the input gear to rotate the head screw The torque and speed of the drive servo gear motor are transmitted to the main shaft gear, and drive the main shaft to rotate, thereby driving the head screw rod connected to the main shaft to rotate.

Further, the head screw linear movement assembly also includes a linear movement motor base, a linear movement ball screw, a linear movement nut, a linear movement linear guide rail, a linear movement slider and a linear movement bearing seat, and the linear movement motor base is fixed to the head. On the screw base, a head screw drive servo motor is installed, the straight-moving nut and the straight-moving slider are fixedly connected to the shaft box, the straight-moving ball screw is matched with the straight-moving nut, and the straight-moving ball screw rotates, Then the straight-moving nut moves linearly, and the straight-moving ball screw is directly connected with the head screw driving servo motor, and the latter is driven to rotate.

Further, the string cross looping mechanism also includes a looping bracket, a looping head lifting cylinder and a looping head swing angle cylinder, the looping bracket is fixed on the shaft box of the head screwing mechanism, and the looping head is The lifting cylinder is fixed on the looping bracket, the looping head swing angle cylinder is fixed on the cylinder rod of the looping head lifting cylinder, and the cross looping head is fixed on the cylinder rod of the looping head swing angle cylinder. The bottom of the cross looping head is provided with a hole groove for avoiding the chord nail, the end of the looping rod is conical, the looping rod is connected with the cross looping head through a threaded pair, and it extends out of the cross looping head. The height of the plane where the bottom of the ring head is located is adjusted by the screw pair.

The present invention is realized in this way, and provides an automatic string processing equipment, in which the above-mentioned string head screwing device is used on the string processing machine.

beneficial effect

Compared with the prior art, the string head screwing device and the automatic string processing equipment using the device of the present invention are provided with a head screwing mechanism and a string cross looping mechanism to automatically complete the strings. Wire string processing and head screw processing. The invention optimizes and improves the technological process of looping and head twisting, and the machined string head has high twisting precision, good repeatability and high stability.

Description of drawings

Fig. 1 is the schematic diagram of the head twist part of the string;

Fig. 2 is the three-dimensional schematic diagram of the use state of the string head screwing device of the present invention;

The top view of FIG. 2 in FIG. 3;

Fig. 4 is the three-dimensional schematic diagram of the head screwing mechanism in Fig. 2;

Fig. 5 is the three-dimensional schematic diagram of the head screw assembly in Fig. 4;

Figure 6 is a side view of the head screw assembly in Figure 4;

7 is a schematic cross-sectional view of the head screw drive assembly in FIG. 4;

Fig. 8 is the three-dimensional schematic diagram of the head screw linear moving assembly in Fig. 4;

Fig. 9 is the three-dimensional schematic diagram of the front string clamping mechanism in Fig. 2;

FIG. 10 is a perspective view of the string clip base assembly of FIG. 9;

Figure 11 is a perspective view of the swing seat assembly in Figure 9;

Fig. 12 is a perspective view of the first string clamping assembly in Fig. 9;

FIG. 13 is a schematic perspective view of the first pneumatic gripper assembly in FIG. 12 in an open state;

FIG. 14 is a schematic perspective view of the first pneumatic gripper assembly in FIG. 12 in a closed state;

Figure 15 is a front view of the first pneumatic gripper assembly of Figure 13;

Figure 16 is a left side view of Figure 15;

Fig. 17 is the three-dimensional schematic diagram of the string trimming scissors assembly in Fig. 9;

Figures 18-1 to 18-4 are schematic diagrams of each action state of the string trimming scissors assembly in Figure 9;

Figure 19 is a perspective view of the rear string clamping mechanism in Figure 2;

Fig. 20 is a three-dimensional schematic diagram of the combined state of the head twist mechanism and the string cross looping mechanism in Fig. 2;

Figure 21 is a perspective view of the cross looping head in Figure 20;

Figure 22 is a perspective view of the combined state of the front string clamping mechanism and the string length-fixing mechanism in Figure 2;

Figure 23 is a perspective view of the string straightening mechanism in Figure 2;

Fig. 24 is a perspective view of the head screwing head assembly and the cross looping head in the working state in Fig. 2;

Figure 25 is a side view of Figure 24;

Figure 26 is an enlarged schematic view of the head screw rod and its end in Figure 24;

Figure 27 is a schematic view of the working state of the cross looping head in Figure 24 pressed against the head twist rod;

Figure 28-1a ~ Figure 28-1c ~ Figure 28-7a ~ Figure 28-7c are schematic diagrams of the string looping process, wherein Figure 28-1a ~ Figure 28-7a are the front views of each step, Figure 28- 1b to 28-7b are the top views of each step, respectively, and FIGS. 28-1c to 28-7c are the left side views of each step, respectively.

BEST MODE FOR CARRYING OUT THE INVENTION

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

Please refer to FIG. 2 and FIG. 3 at the same time, a preferred embodiment of the string head screwing device of the present invention includes a head screwing mechanism 1 for screwing the front section of the string X and a head screwing mechanism 1 for processing the strings. The string circle and auxiliary head-twisted string cross looping mechanism 4. The string head unscrewing device of the present invention and the front string clamping mechanism 2 for clamping the front end of the string X and assisting the head twisting process are used for clamping the string X when the front end of the string X is headed. The rear string clipping mechanism 3 that cuts the string X after the string X is pulled to the fixed length in the rear section, is used to pull the string X to the set length by driving the front string clipping mechanism 2. The long mechanism 5 and the string straightening mechanism 6 for straightening the strings X are combined together to form an automatic string processing device. The automatic string processing equipment further includes a discharging frame 7 carrying the finished strings, a protective cover 8 and a console (not shown in the figure).

The front string clamping mechanism 2 is installed on the string lengthening mechanism 5 and moves together with the string lengthening mechanism 5, and the string cross looping mechanism 4 is fixed on the head screwing mechanism 1 and moves with the head screwing mechanism 1 Move in a straight line. The rear string clamping mechanism 3 is located at the rear of the head screwing mechanism 1, and is located on the same side of the string X together with the head screwing mechanism 1 and the string cross looping mechanism 4. The front string clamping mechanism 2 and The string lengthening mechanism 5 is located on the other side of the string X. The string straightening mechanism 6 is arranged at the end of the string X.

Please refer to FIG. 4 , the included angle between the movement direction of the head twisting mechanism 1 and the string line X is an obtuse angle greater than 90° and less than 180°, such as the included angle C shown in FIG. 3 , the included angle A and the Angles C are complementary angles to each other. The head screwing mechanism 1 includes a head screw head assembly 11 , a head screw drive assembly 12 , a head screw base 13 , a head screw linear movement drive servo deceleration motor 14 and a gas-electric slip ring 15 .

Please refer to FIG. 5 and FIG. 6 at the same time, the head screw assembly 11 includes a head screw rod 111 , a chord plate 112 , a chord 113 , a chord cylinder 114 and a positioning rod 115 . The head screw driving assembly 12 drives the head screw rod 111 to rotate. The string support plate 112 is installed on the top surface of the head twisting rod 111 to hold up the strings X to prevent the strings X from falling off when the strings X are crossed and looped. The chord cylinder 114 is fixed on the front end of the head screw rod 111 , and the chord 113 is fixed on the cylinder rod of the chord cylinder 114 . When the cylinder rod of the chord cylinder 114 is pushed out, the chord stud 113 is higher than the plane where the chord plate 112 is located. When the cylinder rod of the chord cylinder 114 is retracted, the The top end is not higher than the plane where the string plate 112 is located, and the string X can be freely disengaged from the string pin 113 after the string X is twisted. The positioning rod 115 is used to determine the initial position of the head screw rod 111 .

The root of the string peg 113 is on the rotation axis of the head screw rod 111 . The projected included angle between the axis of the string pin 113 and the axis of the head screw rod 111 in the vertical direction is an acute angle θ. After the string X is crossed and looped, it will be wrapped around the root of the peg 113 in a knot shape, so that when the head twist rod 111 is rotated to face the ground, it is ensured that the string will not come off the peg 113 due to the effect of tension. The projected included angle between the axis of the head twisting rod 111 and the axis of the front string clamping mechanism 1 in the horizontal direction is an obtuse angle B.

4 and 7 at the same time, the head screw driving assembly 12 includes a rotating shaft 121 , a shaft box 122 , a head screw rotary drive servo deceleration motor 123 , and a head screw linear moving assembly 124 that drives the shaft box 122 to move linearly. The head screw assembly 11 is disposed on the rotating shaft 121 , and the head screw assembly 11 rotates together with the rotating shaft 121 . The head screw rod 111 is fixed on the rotating shaft 121 by bolts and rotates synchronously with the rotating shaft 121 . The head-twisting rotation drives the servo deceleration motor 123 to drive the rotating shaft 121 to rotate through the rotating shaft box 122 .

The head screw base 13 is fixed on the ground and is parallel to the string X. The head screw head assembly 11 and the string line X are at an obtuse angle greater than 90° and less than 180°, as shown in the included angle C in FIG. The moving assembly 124 slides up.

Referring to FIG. 7 , the shaft box 122 includes a box body 1221 , a main shaft 1222 , an input shaft 1223 , an input gear 1224 and a main shaft gear 1225 , and also includes a roller bearing, a retaining ring, an end bearing for supporting the main shaft 1222 and the input shaft 1223 cover etc. The box body 1221 is connected to the ball screw 1241 of the head screw linear movement assembly 124 through a nut installed at the bottom thereof, and the head screw driving servo motor 1242 of the head screw linear movement assembly 124 drives the whole movement. The head-twisting drive servo deceleration motor 123 drives the input shaft 1223, and the input shaft 1223 drives the input gear 1224 to transmit the torque and rotational speed of the head-trench rotation driving servo deceleration motor 123 to the main shaft gear 1225, and drives the main shaft 1222 to rotate, thereby The head screw rod 111 connected with the main shaft 1222 is driven to rotate. The main shaft 1222 is hollow, and its tail end is connected to the rotating part of the gas-electric slip ring 15 . The air pipe of the screw head assembly 11 is connected to the rotating part of the pneumatic slip ring 15 through the hollow part of the main shaft 1222 to realize air supply.

7 and 8 at the same time, the head screw linear movement assembly 124 includes a translation ball screw 1241, a head screw drive servo motor 1242, a translation motor base 1243, a translation nut 1245, a translation linear guide 1246, The translational slider 1247 and the translational bearing seat 1244 also include bearings, retaining rings, couplings, etc. that support the translational ball screw 1241 . The translation motor base 1243 is fixed on the head screw base 13, and a head screw drive servo motor 1242 is installed. The translational nut 1245 and the translational slider 1247 are fixedly connected with the shaft box 122 . The straight-moving ball screw 1241 cooperates with the straight-moving nut 1245, and when the straight-moving ball screw 1241 rotates, the straight-moving nut 1245 moves linearly. The straight-moving ball screw 1241 is directly connected to the head screw driving servo motor 1242, and is driven to rotate by the latter.

Please refer to FIG. 2 , FIG. 3 and FIG. 9 at the same time, the front string clamping mechanism 2 includes a first string clamping assembly 21 , a swing seat assembly 22 , a string clamping base assembly 23 and a string trimming scissors assembly 24 . The string clamping base assembly 23 is mounted on the string lengthening mechanism 5 and moves on the string lengthening mechanism 5 . The swing seat assembly 22 is installed on the string clamping base assembly 23 , and the first string clamp assembly 21 and the string trimming scissors assembly 24 are respectively installed on the swing seat assembly 22 . The swing seat assembly 22 drives the first string clamping assembly 21 and the string trimming scissors assembly 24 to swing horizontally around the intersection of the axis of the head twisting rod 111 and the axis of the chord pin 113 .

9 and FIG. 10 at the same time, the string clip base assembly 23 includes a base body 231, a string clip motor seat 232, a front string clip linear movement drive servo gear motor 233, a string clip ball screw 234, a clip The chord nut 235 , the chord clamping linear guide 236 , the chord clamping slider 237 and the bearing seat 238 also include bearings, retaining rings, couplings, etc. that support the chord clamping ball screw 234 . The string clipping motor seat 232 is fixed on the base body 231, and is installed with a front string clipping motor 233 that drives linear movement. The string clamping nut 235 and the string clamping slider 237 are fixedly connected with the swing seat assembly 22 . The string clamping ball screw 234 cooperates with the string clamping nut 235, and the string clamping nut 235 moves linearly when the string clamping ball screw 234 rotates. The string clamping ball screw 234 is directly connected with the front clamping string linear movement driving servo deceleration motor 233, which is driven to rotate by the latter.

Please refer to FIG. 9 and FIG. 11 at the same time, the swing seat assembly 22 includes a swing seat bracket 221 and a swing nut seat 222 . The swinging nut seat 222 is fixed on the bottom of the swinging seat bracket 221, and is fixedly connected with the swinging nut, and moves synchronously with the swinging nut.

9 and 12 at the same time, the first string clamping assembly 21 includes a first string clamping seat 211, a first air gripper bracket 212, a first string clamping linear guide 213, a first pneumatic clamping jaw assembly 214, The first cylinder 215 , the first swing drive servo reduction motor 216 , the first drive gear 217 , the first slider and roller 218 , the arc guide 219 , the ring gear 2110 and the pushing cylinder 2111 . The arc guide rail 219 and the gear ring 2110 are respectively fixed on the swing seat bracket 21 of the swing seat assembly 22 . The first string clamping seat 211 and its upper parts, and the first swing driving servo deceleration motor 216 are fixedly connected to the string clamping slider 237 and the roller of the string clamping base assembly 23, and the first swing driving servo deceleration motor 216 drives the first drive gear 217 directly connected to it, and meshes with the ring gear 2110 to drive the first string holder 211 and the string trimming scissors assembly 24 to rotate around the center of the ring gear 2110 as a whole, and the rotation angle is greater than 0° and less than 90°, that is, the swing of the front string clamping mechanism 2 is realized. The first pneumatic gripper assembly 214 is fixedly connected with the first gripper support 212 , and the first gripper support 212 is mounted on the slider of the first gripper linear guide 213 and is driven by the first air cylinder 215 to realize The forward extension and retraction of the first pneumatic jaw assembly 214 . The first string clipping linear guide 213 is fixedly connected to the first string clipping seat 211 , and the string trimming scissors assembly 24 is installed on the first string clipping seat 211 and swings synchronously with the first string clipping seat 211 . The pusher cylinder 2111 is fixed on the first string holder 211, and a pusher plate (not shown in the figure) is installed at the end of the cylinder rod of the pusher cylinder 2111, which is used to push out the finished piano after the head is screwed. string.

13, 14, 15 and 16, the first pneumatic gripper assembly 214 includes a first pneumatic gripper cylinder 2141, a first upper gripper 2142, a first lower gripper 2143, a first gripper gripper A guide taper rod 2144 and a first adjusting lock nut 2145 . The opening and closing between the first upper jaw 2142 and the first lower jaw 2143 is -2° to 23°. When the first upper jaw 2142 and the first lower jaw 2143 are in a closed state, the strings X are clamped. The first upper clamping jaw 2142 and the first lower clamping jaw 2143 are respectively installed on the upper and lower opening and closing connectors of the first pneumatic clamping jaw cylinder 2141 . A plurality of threaded holes are respectively provided on the bodies of the first upper clamping jaw 2142 and the first lower clamping jaw 2143 for installing the first guide taper rods 2144 respectively. Two mutually perpendicular first longitudinal grooves 2146 and first transverse grooves 2147 are respectively provided on the opposite contact surfaces of the first upper clamping jaw 2142 and the first lower clamping jaw 2143 . When the string X is clamped, the string X is clamped longitudinally by the first longitudinal grooves 2146 , or the string X is clamped laterally by the first transverse grooves 2147 . The end of each of the first guide taper rods 2144 is tapered, and its tail is threaded, and the first guide taper rod 2144 is adjusted by cooperating with the threaded holes of the first upper clamping jaw 2142 and the first lower clamping jaw 2143. The tapered portion protrudes from the height of the contact surface of the first upper jaw 2142 and the first lower jaw 2143 which are opposite to each other. After the height adjustment is completed, it is locked by the first adjustment locking nut 2145 . The first upper clamping jaw 2142 and the first lower clamping jaw 2143 are respectively provided with a lower groove 2148 and an upper groove 2149 on the tapered portion facing the first guide tapered rod 2144 for accommodating the insertion of the tapered portion of the first guide tapered rod 2144 , to ensure that the first upper jaw 2142 and the first lower jaw 2143 are closed without obstacles. The first guide taper rods 2144 are respectively installed on both sides of the first longitudinal groove 2146 or the first transverse groove 2147 to form a V-shaped groove. When the straight end portion of the string X after being crossed and looped is in the jaws of the first upper jaw 2142 and the first lower jaw 2143, due to uncontrollable and precision reasons, the string X is relatively The longitudinal grooves 2146 may deviate a little, so the V-shaped grooves can effectively guide the strings X back into the first longitudinal grooves 2146, so as to ensure that the relative angle of the string heads remains unchanged when twisting, thereby improving reliability. The first transverse groove 2147 and the corresponding first guide taper rod 2144 have the same functions as the first longitudinal groove 2146, except that the first transverse groove 2147 is used to clamp the transverse string X and complete the string pulling function .

Please refer to FIG. 17 and FIG. 18-1 to FIG. 18-4 at the same time, the string trimming scissors assembly 24 includes a tail scissor bracket 241, a scissor frame 242, a tail scissor pneumatic scissors 243, a tail scissor lift cylinder 244, a tail scissor Shear telescopic cylinder 245 , tail shear horizontal linear guide 246 and tail shear vertical linear guide 247 . The tail shear horizontal linear guide 246 and the tail shear telescopic cylinder 245 are fixed on the first string holder 211 , and the tail shear bracket 241 is fixedly connected with the slider of the tail shear horizontal linear guide 246 and is connected to the tail shear telescopic cylinder 245 The cylinder rod is fixedly connected, and is pushed by the tail shear telescopic cylinder 245 to slide horizontally on the tail shear horizontal linear guide rail 246. The tail scissor vertical linear guide 247 and the tail scissor lift cylinder 244 are fixed on the tail scissor bracket 241 . The tail shear pneumatic scissors 243 are fixedly connected to the scissors frame 242, and the scissors frame 242 is installed on the slider of the tail shear vertical linear guide 247, and is fixedly connected with the cylinder rod of the tail shear lift cylinder 244. The lift cylinder 244 is pushed to slide vertically on the vertical linear guide 247 of the tail shear. The string trimming scissors assembly 24 performs the action flow of extending→raising→cutting→dropping→retracting the tail trimming scissors 243, as shown in FIG. 18-1 to FIG. 18-4. In the figure, the direction shown by the half arrow is the movement direction of the string trimming scissors assembly 24, and the large hollow arrow shows the flow direction of the process. The extended state of the string trimming scissors assembly 24 is shown in Figure 18-1, its raised and cut states are shown in Figure 18-2, its fallen state is shown in Figure 18-3, and its retracted state is shown in Figure 18-2. 18-4. After the scissors mouth of the tail-scissor pneumatic scissors 243 is raised, it will exceed the strings X clamped after the first pneumatic clamping jaw assembly 214 is closed, so that the tail-scissors pneumatic scissors 243 can cut the strings X.

Please refer to FIG. 3 and FIG. 19 at the same time, the movement direction of the rear string clamping mechanism 3 is perpendicular to the string line X, the angle D shown in FIG. 3 . The rear string clamping mechanism 3 includes a rear string clamping base 31, a second string clamping assembly 32, a fixed-length scissors 33, a rear string clamping linear guide 34, a rear string clamping cylinder 35, and a rear string clamping air claw bracket. 36. The rear string clamping base 31 is fixed on the ground, and the rear string clamping linear guide rail 34 is fixed thereon. The second string clamping assembly 32 is mounted on the rear string clamping air gripper bracket 36 . The rear string clamping air claw bracket 36 is fixed on the slider of the rear string clamping linear guide 34, and is fixedly connected with the cylinder rod of the rear string clamping cylinder 35, which is driven by the rear string clamping cylinder 35 to drive the second clamp The string assembly 32 slides on the rear string clamping linear guide 34 . The fixed-length scissors 33 are fixed on the side of the rear string clamping air claw bracket 36, parallel to the second string clamping assembly 32, and move synchronously with the second string clamping assembly 32, and the scissors mouth of the fixed-length scissors 33 will exceed the second string clamping. The string X is clamped after the assembly 32 is closed, so that the fixed-length scissors 33 can cut the string X. The second string clamping assembly 32 is perpendicular to the string X and is located on the rear side of the front string clamping mechanism 2 .

20 and 21 at the same time, the string cross looping mechanism 4 includes a looping bracket 41 , a cross looping head 42 , a looping head lifting cylinder 43 and a looping head swing angle cylinder 44 . The looping bracket 41 is fixed on the shaft box 122 of the head screwing mechanism 1 . The looping head lifting cylinder 43 is fixed on the looping bracket 41, the looping head swing angle cylinder 44 is fixed on the cylinder rod of the looping head lifting cylinder 43, and the cross looping head 42 is fixed on the looping head on the cylinder rod of the swing angle cylinder 44. The bottom of the cross looping head 42 is provided with a hole groove 46 for avoiding the chord pin 113 . A looping rod 45 is provided on the cross looping head 42 . The included angle between the axis of the looping rod 45 and the axis of the cross looping head 42 is an acute angle ψ, and the end of the looping rod 45 protrudes out of the plane where the bottom of the cross looping head 42 is located.

The looping rod 45 is connected with the cross looping head 42 through a screw pair, and the height of the plane where the bottom of the looping rod 45 extends out of the cross looping head 42 is adjusted by the screw pair. The end of the looping rod 45 is conical.

The head screwing head assembly 11 effectively fixes the string ring of the string to prevent the string X from falling off during the looping and turning process of the string; a looping rod 45 is set in the string cross looping mechanism 4 to effectively fix The direction of the string body and the cross-circled tail end prevents the string X from being offset and failing during the head-twisting process.

Embodiments of the present invention

24 to 27 at the same time, the following describes how the head twisting head assembly 11 cooperates with the string cross looping mechanism 4 to realize the looping and head twisting process of the strings.

A string bearing slope A1 is provided at the front end of the head twisting rod 111 to hold up the string X, and the string pegs 113 are arranged in the string bearing slope A1. Setting the string bearing slope A1 can prevent the string X from falling before the cross looping action of the string X is performed, and can make the front section a of the string lift up, and the string X is close to the string pin 113 b is suspended from the string carrying slope A1. A raised inclined stepped surface A2 is provided at the position of the string bearing inclined surface A1 close to the string X, and the inclined stepped surface A2 is parallel to the axis of the string X. The upper end of the inclined step surface A2 is close to the chord pin 113 . A side elevation A3 perpendicular to the string bearing slope A1 is arranged at the high end of the inclined step surface A2.

The inclined step surface A2 is set on the left side close to the string pin 113 (viewed in the direction perpendicular to the axis of rotation of the head screw rod 111, the string pin 113 is in front.), when the head screw rod 111 is close to the string line X, The string X slides to the high-end interface along the inclined step surface A2 and stays at the side elevation A3. When the cross looping head 42 is pressed down, the bottom surface A4 of the cross looping head 42, the string bearing slope A1, the side elevation A3, and the circumferential surface of the string peg 113 form a closed space surrounded by four sides, so that the string X is positive. The advantage lies in the enclosed space. When the looping rod 45 performs cross looping later, because the string X is limited in the enclosed space, the string X will not be greatly bent, and the string X will not be bent. The phenomenon of arching will not occur, thereby effectively avoiding the problem that the length of the end of the string after the looping is uncontrollable due to the relaxation of the head of the string after the cross looping.

At the same time, when the head twisting rod 111 is close to the string X, the high end of the string touching the inclined step surface A2 is lifted up. Due to the rigidity of the string X itself, the part close to the peg 113 will hang away from the string X. Inclined step surface A2. Therefore, when the cross looping head 42 is pressed down, the suspended part will be pressed down against the inclined step surface A2, so that the string X produces a slight fold angle at the position of the cross looping head 42. When making cross loops, the front section of the string is bent back to an angle greater than 180°, and due to the existence of the folded angle, it will cross through the bottom of the string body of the main string, thus effectively avoiding the occurrence of the main string. Interfere to realize the circle process.

An annular groove for avoiding the end of the looping rod 45 is also provided on the string bearing slope A1 near the peg 113, and the annular groove is a V-shaped groove to avoid the end of the looping rod 45. Cone. At the same time, the rigidity of the cross looping head 42 is improved, and when the string X is tightened during the head-twisting process, due to the relationship of the V-shaped groove, the head of the string X will slide into the V-shaped groove surface B1 and the hanging string. The nails 113 are on the intersection of the circumferential surfaces, so as to ensure that the head of the string is always on the axis of rotation during rotation, and effectively avoid the problem of poor quality of the strings caused by eccentric rotation.

The V-shaped groove surface B1 and the circumferential surface A5 of the peg 113 form an intersection line L1. After the string X is rewound and tensioned, it will slide to the intersection line L1. The surface formed by the intersection line L1 and the axis of the peg 113 intersect at Point O1 is located on its rotation axis L0, so when the head screw rod 111 is rotated, the string head screw head will rotate symmetrically around the rotation axis L0 to ensure the quality of the string head screw.

Please refer to Figure 24 to Figure 27 at the same time, and Figure 28-1a to Figure 28-1c to Figure 28-7a to Figure 28-7c, the looping process of the string X is as follows:

(1) The head twisting rod 111 moves forward until the string pegs 113 are close to the string X. During this process, the string bearing slope A1 cuts into the bottom surface of the string X obliquely. Since the string bearing slope A1 is low in front and rear high, the contact point with the string X is gradually raised in the vertical direction, so the string X is lifted. During this process, due to the inclined stepped surface A2, the string X will first contact the inclined stepped surface A2, and slide along the inclined stepped surface A2 to the high-end point, and finally locate at the side elevation A3 of the inclined stepped surface A2 .

(2) The cross looping head 42 is pressed down, and its bottom surface A4 presses the string X to be in close contact with the string bearing inclined surface A1, and due to the side elevation A3 of the inclined step surface A2 and the bottom surface A4 of the cross looping head 42 , The role of the closed space formed by the string bearing slope A1 and the outer circular surface A5 of the string pin 113, the string X is stuck in this closed space, when the string X starts to cross and circle, the string X Large arching does not occur.

(3) The looping rod 45 is rotated, and the string X is wound back along the cylindrical surface A5 of the peg 113 to the front section of the string X, passing through the string body of the main string X and forming a certain angle. Because there is a string bearing slope A1, and the front is low and the back is high, when the string X is rotated, it will form a state where the end of a is low and the head of b is high. At this time, the end of the string X can pass through the piano. The string body of the string X is always under the string body to complete the looping process of the string X.

Please refer to FIG. 3 and FIG. 22 at the same time, the movement direction of the string lengthening mechanism 5 is parallel to the string line X. The string length-fixing mechanism 5 includes a fixed-length base 51 , a fixed-length moving guide rail 52 , a fixed-length drive servo deceleration motor 53 and a fixed-length connecting seat 54 . The fixed-length base 51 is fixed on the ground, the fixed-length moving guide 52 is fixed on the fixed-length base 51, the fixed-length drive servo deceleration motor 53 is fixed on the fixed-length connecting seat 54, and the fixed-length connecting seat 54 is installed on the fixed-length base 51, Driven by the fixed-length drive servo deceleration motor 53, it moves along the fixed-length moving guide rail line 52, the fixed-length moving guide rail 52 is parallel to the string line X, and the front string clamping mechanism 2 is installed on the fixed-length connecting seat 54.

Please refer to Fig. 3 and Fig. 23 at the same time, since the strings are wound on the string plate in a roll shape in the initial state, and the strings are spirally deformed, it is necessary to straighten the strings first. The string straightening mechanism 6 performs the straightening operation. The string straightening mechanism 6 includes a straightening base 61 , a string guide sleeve 62 and a straightening roller 63 . The straightening base 61 is fixed on the ground, the string guide sleeve 62 is fixed on the straightening base 61, the straightening roller 63 is fixed on the straightening base 61, and is located directly behind the string guide sleeve 62. The axis of the guide sleeve 62 is collinear with the central axis of the straightening roller 63 , and the string X straightened by the straightening roller 63 passes through the central hole of the string guide sleeve 62 . The string straightening mechanism 6 performs the straightening operation before and during the operation of twisting the strings of the strings, as well as during the fixed-length cutting process.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Industrial Applicability

Type an industrial applicability description paragraph here.

Sequence Listing Free Content

Type the Sequence Listing free content description paragraph here.

Claims (10)

1. A string head screwing device is characterized in that it comprises a head screwing mechanism for performing head screwing processing on the front section of a string wire and a string cross looping mechanism for processing the strings of the strings and assisting the head screwing processing. , the head screwing mechanism includes a head screwing head assembly, the head screwing head assembly includes a head screwing rod and a string peg, the string cross looping mechanism includes a cross looping head, and the cross looping head is provided with A looping rod, a string bearing slope is arranged at the front end of the head twisting rod, and the string peg is arranged in the string bearing slope, and the projection of the axis of the string peg and the axis of the head twist rod in the vertical direction The included angle is an acute angle θ, a raised inclined stepped surface is set at the position of the string bearing inclined surface close to the string line, the high end of the inclined stepped surface is close to the string stud, and the high end of the inclined stepped surface is set perpendicular to the string. The side elevation of the string bearing slope, after the looping head descends to press the string, the bottom surface of the looping head, the side elevation of the high end of the inclined step surface, the string bearing slope and the outer circumference of the string peg The faces form an enclosed space surrounded on all four sides, and the strings are confined within this enclosed space.
2. The string head screwing device according to claim 1, wherein the head screwing assembly further comprises a tailpiece and a peg cylinder, and the tailpiece is installed on the top surface of the head screw rod to hold up The function of the strings is that the peg cylinder is fixed on the front end of the head screw rod, and the peg is fixed on the cylinder rod of the peg cylinder. When the cylinder rod of the peg cylinder is pushed out, the hanging string The nail is higher than the plane where the chord plate is located, and when the cylinder rod of the chord cylinder is retracted, the top end of the chord nail is not higher than the plane where the chord plate is located.
3. The string head screwing device according to claim 2, wherein the head screwing mechanism further comprises a head screw driving assembly and a head screw base, and the head screw base is fixed on the ground and is parallel to the strings. The head screw driving assembly is arranged on the head screw base, the head screw head assembly is arranged on the head screw drive assembly, and the head screw drive assembly drives the head screw rod to rotate.
4. The string head screwing device according to claim 2, wherein the root of the string peg is located on the rotation axis of the head screwing rod, and the axis of the head screwing rod and the axis of the front string clamping mechanism are in line with each other. The projected angle in the horizontal direction is an obtuse angle.
5. The string head screwing device according to claim 2, wherein the head screw driving assembly comprises a rotating shaft, a shaft box, a head screw rotary drive servo reduction motor, and a head screw linear moving assembly for driving the shaft box to move linearly , the rotating shaft box is fixed on the head screw base, the head screw head assembly is arranged on the rotating shaft, the head screw rod is fixed on the rotating shaft by bolts and rotates synchronously with the rotating shaft, and the head screw rotation drives the servo gear motor The shaft is driven to rotate through the shaft box.
6. The string head screwing device according to claim 2, wherein the head screwing mechanism further comprises a head screw linear movement drive servo deceleration motor and a gas-electric slip ring, and the head screw head assembly is larger than the string wire. The obtuse angle of 90° and less than 180° is driven by the head screw linear movement drive servo gear motor to slide on the head screw linear movement assembly.
7. The string head screwing device according to claim 5, wherein the shaft box comprises a box body, a main shaft, an input shaft, an input gear and a main shaft gear, and the head screw linear moving assembly comprises a ball screw and a head screw Drive the servo motor, the box is connected with the ball screw of the head screw linear moving assembly through the nut installed at the bottom of the box, the head screw driving servo motor of the head screw linear moving assembly drives the overall movement, and the head screw rotates to drive the servo deceleration motor Drive the input shaft, the input shaft drives the input gear to transmit the torque and rotational speed of the head screw driving servo reduction motor to the main shaft gear, and drives the main shaft to rotate, thereby driving the head screw rod connected to the main shaft to rotate.
8. The string head screwing device according to claim 5, wherein the head screwing linear moving assembly further comprises a translation motor seat, a translation ball screw, a translation nut, a translation linear guide, and a translation slider and a straight-moving bearing seat, the straight-moving motor seat is fixed on the head screw base, and a head-twisting drive servo motor is installed, the straight-moving nut, the straight-moving slider and the shaft box are fixedly connected, and the straight-moving ball The screw rod is matched with the straight-moving nut, the straight-moving ball screw rotates, the straight-moving nut moves linearly, and the straight-moving ball screw is directly connected with the head screw driving servo motor, which is driven and rotated by the latter.
9. The string head screwing device according to claim 5, wherein the string cross looping mechanism further comprises a looping support, a looping head lifting cylinder and a looping head swing angle cylinder, and the looping support It is fixed on the shaft box of the head screwing mechanism, the looping head lifting cylinder is fixed on the looping bracket, the looping head swing angle cylinder is fixed on the cylinder rod of the looping head lifting cylinder, and the cross looping head is fixed on the cylinder rod of the looping head lifting cylinder. It is fixed on the cylinder rod of the swing angle cylinder of the looping head, the bottom of the cross looping head is provided with a hole groove for avoiding the chord pin, the end of the looping rod is conical, and the looping rod The thread pair is connected with the cross looping head, and the height of the plane where the bottom of the cross looping head extends out is adjusted by the screw pair.
10. An automatic string processing equipment, characterized in that the string head screwing device according to any one of claims 1 to 9 is used on the string processing machine.