CN203418399U - Device for machining long-radius arc face on piano rib - Google Patents

Abstract

The utility model discloses a large-radius circular-arc surface processing equipment on piano ribs, which comprises a frame, a workbench, a power wheel, a tension wheel, a profiling grinding head, an abrasive belt and a power device, wherein the power device Connected with the power wheel, the profiling grinding head is fixed on the frame, and the profiling grinding head has an arc-shaped surface; the abrasive belt wraps around the power wheel, the tensioning wheel and the profiling grinding head to form a closed triangle ; A processing space is formed between the profiling grinding head and the workbench for allowing the ends of ribs to be pushed in; The radii of the arcs are equal. The processing equipment of the large-radius arc surface on the piano rib of the utility model has the advantages of high working efficiency, high precision and low labor intensity.

Description

A processing equipment for large-radius arc surface on piano ribs

technical field

The utility model relates to a processing device for piano parts, in particular to a processing device for a large-radius arc surface on a piano rib.

Background technique

Referring to Fig. 1, the rib 1 is an important part in the piano, which is bonded on the soundboard 2 of the piano to improve the elasticity and hardness of the soundboard 2, and simultaneously it can transmit sound waves to the whole soundboard 2 rapidly. The wood texture of piano soundboard 2 and strings is arranged diagonally from low, middle to high tones, and the grain direction of rib 1 is vertically arranged with soundboard 2 and strings, so that the wood texture forms a horizontal and vertical cross network , so that the sound is excited at any point of the string code, and it can quickly spread throughout the entire soundboard 2 .

Because the stress at both ends of the rib 1 decreases, it is cut into an arc surface 1-1, which can avoid the two ends of the rib 1 from warping and reduce the elasticity of the sound board 2. The ribs 1 at different positions of the soundboard 2 have different effects on the elasticity of the soundboard 2. Therefore, the radius of the arc surface 1-1 of the rib 1 needs to be designed according to the vibration law of the soundboard 13 and the position of the rib 1. Generally speaking Said, the arc surface 1-1 of the rib 1 is divided into three kinds of small radius, middle radius and large radius, for example, in a piano of a certain model, the radius of the small radius arc surface 1-1 is R40mm, and the medium diameter arc surface The radius of 1-1 is R175mm, and the radius of large-radius arc surface 1-1 is divided into four types: R300mm, R450mm, R600mm and R800mm.

The processing method of the arc surface 1-1 on the existing rib 1 is to rough-machine the outline of the arc surface 1-1 according to the mold surface with a woodworking chisel, leaving a certain machining allowance; Plan out according to the arc profile, and then use the inspection mold to check whether it meets the requirements. This existing processing method has the disadvantages of low efficiency, poor precision, and high labor intensity, and when rough machining is performed with a woodworking chisel, the cutting tool may extend along the wood grain. , if the amount of feed is large, tearing will occur along the direction of the wood grain. When the tear surface even exceeds the machined contour surface, there are processed products and even waste products.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a processing equipment for large-radius arc surfaces on piano ribs. The processing equipment has the advantages of high work efficiency, high precision and low labor intensity.

The technical scheme that the utility model realizes above-mentioned purpose is:

A kind of processing equipment of large-radius arc surface on piano rib, it is characterized in that, comprises frame, workbench, power wheel, tension wheel, profiling grinding head, abrasive belt and power device, wherein, described power device and The power wheel is connected, the profiling grinding head is fixed on the frame, and the profiling grinding head has an arc-shaped surface; the abrasive belt wraps around the power wheel, the tensioning wheel and the profiling grinding head to form a closed triangle; A processing space is formed between the profiling grinding head and the workbench for pushing the ends of the ribs in; The arcs have equal radii.

In a preferred solution of the present invention, the processing equipment includes two sets of processing components, each set of processing components includes the above-mentioned workbench, power wheel, tensioning wheel, profiling grinding head, abrasive belt and power device. Each set of processing components can independently complete the processing of the large-radius arc surface on the rib, which is conducive to improving efficiency and saving space. Specifically, the two sets of processing assemblies are arranged front and back, and the two workbenches of the two sets of processing assemblies are arranged on the left and right sides, and the two abrasive belts of the two sets of processing assemblies are arranged front and back in a cross shape. In this way, two sets of processing components can be set up only by using the space of one set of processing components, which makes full use of the space; workers operate on the left and right sides respectively, without affecting each other, as long as the radius of the arc-shaped surface is selected for the two sets of processing components Two different profiling grinding heads can process large-radius arc surfaces on ribs with two different radii, making full use of the space and improving work efficiency.

In a preferred solution of the present utility model, graphite cloth is arranged on the arc-shaped surface of the profiling grinding head. Since the profiling grinding head is fixed during work, if the graphite cloth sheet is not provided, the abrasive belt will directly rub and slide through its arc-shaped surface, and the profiling grinding head will be worn after working for a long time, which will affect the processing accuracy, and The abrasive belt is easy to wear and tear, which reduces the life of the abrasive belt; after the graphite cloth sheet is installed, the graphite cloth sheet has a small friction coefficient and good wear resistance, so it can not only protect the profiling grinding head, but also itself is not easy to be damaged. wear and tear.

A preferred solution of the utility model, wherein, the profiling grinding head is provided with a guide wheel at one end corresponding to the tensioning wheel; along the movement direction of the abrasive belt, the abrasive belt bypasses the profiling grinding head in turn arc-shaped surface and guide wheels. Since the arc-shaped surface of the profiling grinding head is just a section of arc, if the abrasive belt directly wraps around the arc-shaped surface of the power wheel, the tensioning wheel and the profiling grinding head, the arc-shaped surface of the profiling grinding head will The outlet end of the outlet forms a sharper corner, which will affect the smoothness of the movement of the abrasive belt, and the abrasive belt is easy to break. After adding the guide wheel, the abrasive belt can be placed at both ends of the arc-shaped surface of the profiling grinding head. Smooth transition ensures smooth movement of the abrasive belt and prolongs the service life of the abrasive belt.

A preferred solution of the present utility model, wherein, the profiling grinding head is divided into multiple types according to the radius of the arc-shaped surface, and the length of the abrasive belt is fixed; for each profiling grinding head, along the abrasive belt The length of the orbiting path of is a fixed value, and the length is equal to the length of the abrasive belt. That is, no matter which kind of profiling grinding head is used, along the circular path of the abrasive belt, the length of a circle around the arc-shaped surface of the profiling grinding head, the power wheel and the tensioning wheel is constant. The length is equal to the length of the abrasive belt, so that the abrasive belt of the same specification can be used for different profiling grinding heads, so that when processing large-radius arc surfaces on ribs with different radii, only the profiling grinding head needs to be replaced. Yes, there is no need to replace the abrasive belt.

Further, the connection structure between the profiling grinding head and the frame is as follows: the frame is provided with a fixed connection point for connecting with the profiling grinding head, and the fixed connection point is provided with a positioning shaft. The shaped grinding head is provided with a positioning hole, and the positioning shaft is pushed into the positioning hole; the side frames of the profiling grinding head are fixedly connected by bolts. The position of the profiling grinding head is roughly limited by the cooperation of the positioning shaft and the positioning hole, and then the profiling grinding head is fixed through the bolt connection to realize a fixed connection. The selection of the positioning hole in each type of profiling grinding head should meet the following requirements: the length of the circle around the abrasive belt is a fixed value, and the length is equal to the length of the abrasive belt.

A preferred solution of the present utility model, wherein, the tensioning wheel is provided with a tensioning device, the tensioning device is: the tensioning wheel is arranged on a swing rod, the lower end of the swing rod is hinged with the frame, the A tension spring is arranged between the swing rod and the frame, and the tension spring generates a pulling force on the swing rod to make the tension wheel in the working position under normal conditions; a pressing rod for pressing down the swing rod is provided on the swing rod. Its working principle is: when the abrasive belt needs to be replaced, press down the pressing lever, so that the swing drives the tension wheel to move downward, and the perimeter of the triangle formed by the arc-shaped surface of the profiling grinding head, the power wheel and the tension wheel Zoom out, now you can load or take out the abrasive belt, after reinstalling the abrasive belt, release the pressing lever, under the action of the tension spring, the swing lever returns to the working position, and the abrasive belt is tensioned.

A preferred solution of the present utility model, wherein the tensioning wheel is connected with a swinging mechanism for promoting the abrasive belt to slide back and forth on the tensioning wheel, the swinging mechanism includes a drive motor, an eccentric wheel connected with the output shaft of the drive motor , a connecting rod and a swing arm, wherein, one end of the connecting rod is hinged to the eccentric wheel, and the other end is hinged to one end of the swing arm; There is a bearing, and a fixed shaft is arranged in the swing bush, and there is a swing gap between the fixed shaft and the swing bush, and the end of the fixed shaft is fixedly connected with the frame; the fixed shaft and the swing bush are pierced There is a swing pin, the axis of the swing pin is perpendicular to the axis of the fixed shaft; the other end of the swing arm is fixedly connected with the swing sleeve.

In a preferred solution of the present invention, the power device includes a motor, and the motor is connected to the power wheel through a belt transmission mechanism.

The working principle of the utility model is: driven by the power device, the power wheel rotates, driving the abrasive belt to move around the arc-shaped surface of the profiling grinding head, the power wheel and the tensioning wheel. Ribs, and make the bottom surface of the ribs close to the workbench, push the end of the ribs from the processing space and feed forward, because the outer diameter of the abrasive belt on the arc-shaped surface of the profiling grinding head and the large radius on the ribs The radii of the arc surfaces are equal, so that the abrasive belt can accurately process the large-radius arc surfaces on the ribs.

Compared with the prior art, the utility model has the following beneficial effects:

1. The processing power is provided by the power device. The worker only needs to push the end of the rib into the processing space and then take it out to complete the processing. The work efficiency is greatly improved and the labor intensity is also greatly reduced.

2. Using the abrasive belt for grinding, the surface of the arc surface will not be torn along the direction of the wood grain, and will not leave small pits on the surface of the arc surface, which greatly improves the surface processing quality.

3. The length of the abrasive belt can be set longer, so that the abrasive belt does not need to be replaced frequently, saving time.

4. Since the diameter of the large-radius arc surface on the rib is relatively large, such as R800mm, if a profiling cylinder is used, the diameter of the cylinder must reach as much as 1.6m. It is difficult to install such a large cylinder. Even if it can be installed, it will The entire processing equipment is bulky; the utility model cleverly uses a part of the arc surface of the cylinder to carry out profiling to form a profiling grinding head, which is not only easy to install, but also saves space, and can be set into different specifications for flexible replacement. .

Description of drawings

Fig. 1 is the structural representation of piano sound board and rib.

2 to 4 are schematic diagrams of the mechanism of a specific embodiment of the processing equipment for the large-radius arc surface on the piano ribs of the present invention, wherein Fig. 2 is the front view, Fig. 3 is the left side view, and Fig. 4 is the top view.

Fig. 5 is an enlarged view of the profiling grinding head part of the first machining assembly in Fig. 2 .

Fig. 6 is an enlarged view of the tensioning device of the first processing unit in Fig. 2 .

7 to 9 are structural schematic diagrams of the swing mechanism of the second set of processing components in FIG. 2 , wherein FIG. 7 is a front view, FIG. 8 is a left view of FIG. 7 , and FIG. 9 is a top view of FIG. 8 .

The reference signs in the figure are: 1 rib; 1-1 large radius arc surface; 2 sound board; 3 frame; 4a workbench; 4b workbench; 5a power wheel; 5b power wheel; 6a tension wheel; Tightening wheel; 7a profiling grinding head; 7b profiling grinding head; 8a abrasive belt; 8b abrasive belt; 9a guide wheel; 9b guide wheel; 10a power unit; 10b power unit; 11a beam; 11b beam; 12a graphite cloth; 12b graphite cloth piece; 13a supporting seat; 14a belt; 15a pressing rod; 16a positioning shaft; 17a bolt; 18a right angle connecting ear; 19a adjusting bolt; 24a tension spring; 25b drive motor; 26b eccentric wheel; 27b connecting rod; 28b swing arm; 29b fixed shaft; 30b swing pin; Among the above-mentioned reference numerals 4-34, the ones with a behind them represent the parts in the first set of processing components, the ones with b behind them represent the components in the second set of processing components; the ones with only a or only b represent the other set Identical parts are not marked in the figures.

Detailed ways

The utility model will be further described in detail below in conjunction with the embodiments and accompanying drawings, but the implementation of the utility model is not limited thereto.

Referring to Figures 2 to 4, the processing equipment for the large-radius arc surface on the piano ribs of this embodiment includes a frame 3 and two sets of processing components. Make a detailed description. The first set of processing components includes a workbench 4a, a power wheel 5a, a tension wheel 6a, a profiling grinding head 7a, an abrasive belt 8a, and a power unit 10a, wherein the power unit 10a is connected to the power wheel 5a, and the profiling The grinding head 7a is fixed on the frame 3, and the profiling grinding head 7a has an arc-shaped surface; the abrasive belt 8a is formed around the arc-shaped surface of the power wheel 5a, the tension pulley 6a and the profiling grinding head 7a Closed triangle; between the profiling grinding head 7a and the workbench 4a, a processing space for allowing the end of the rib to be pushed in is formed between the profiling grinding head 7a; The outer diameter is equal to the radius of the large radius arc surface on the rib.

Referring to Figures 2 to 5, the frame 3 is provided with a crossbeam 11a arranged transversely and obliquely, and the profiling grinding head 7a and the power wheel 5a are respectively arranged at the left and right ends of the crossbeam 11a. The profiling grinding head 7a is composed of an arc-shaped surface portion and a connecting portion, and the arc-shaped surface portion is a part of a cylindrical surface with the same radius. The connecting part is connected with the crossbeam 11a in the following manner: the crossbeam 11a is provided with a fixed connection point for connecting with the profiling grinding head 7a, the fixed connection point is provided with a positioning shaft 16a, and the connection part is provided with There is a positioning hole, the positioning shaft 16a is inserted in the positioning hole (see Figure 5); the crossbeam 11a is provided with a right-angled connecting ear 18a, and the right-angled connecting ear 18a passes through the side of the connecting part Bolt 17a connection, wherein, one end of bolt 17a is threaded on the side of the connection part, and this end of bolt 17a is also provided with nut 33a, and this nut 33a is compressed on the side of connection part, and the other end of bolt 17a It is connected to the right-angled connecting ear 18a through two nuts 34a. In the above connection method, the position of the profiling grinding head 7a is roughly limited by the cooperation of the positioning shaft 16a and the positioning hole, and then the profiling grinding head 7a is fixed by the bolts 17a, nuts 33a, 34a and right-angled connecting ears 18a , not only to ensure accurate positioning of the profiling grinding head 7a, but also to ensure a firm connection.

Referring to Fig. 2 and Fig. 5, a graphite cloth sheet 12a is provided on the arc-shaped surface of the profiling grinding head 7a, and the abrasive belt 8a bypasses the surface of the graphite cloth sheet 12a. Since the profiling grinding head 7a is fixed during work, the abrasive belt 8a slides through its arc-shaped surface, and the graphite cloth sheet 12a is set to prevent the profiling grinding head 7a from wearing and tearing. The profiling grinding head 7a is provided with a guide wheel 9a at one end corresponding to the tension wheel 6a, and the guide wheel 9a is fixed on the crossbeam 11a through a connecting rod; along the movement direction of the abrasive belt 8a when working, the The abrasive belt 8a passes around the arc-shaped surface of the profiling grinding head 7a and the guide wheel 9a in turn. Because the arc-shaped surface of the profiling grinding head 7a is just a section of arc, if the abrasive belt 8a directly surrounds the arc-shaped surface of the power wheel 5a, the tension pulley 6a and the profiling grinding head 7a, it will be on the profiling grinding head The two ends of the arc-shaped surface of 7a form sharper corners, which will affect the smoothness of the movement of the abrasive belt 8a, and the abrasive belt 8a is easy to break, and after adding the guide wheel 9a, the abrasive belt 8a can be made in profiling The smooth transition between the two ends of the arc-shaped surface of the grinding head 7a ensures smooth movement of the abrasive belt 8a and prolongs the service life of the abrasive belt 8a.

Referring to Fig. 2 to Fig. 5, the power wheel 5a is connected to the beam 11a through a bearing, and a driven pulley is coaxially arranged on the power wheel 5a. Described power unit 10a comprises motor, and the output shaft of this motor is connected with power pulley 5a by belt transmission mechanism, and this belt transmission mechanism is by being located at the driving pulley on the output shaft of motor, belt 14a and being located on the power pulley 5a. driven pulley.

Referring to Fig. 2-Fig. 4, Fig. 6 and Fig. 7, the tensioning wheel 6a is arranged on the top of the frame 3, and the tensioning wheel 6a is provided with a tensioning device, and the tensioning device is: the tensioning wheel 6a is arranged on the fork 23a, and the lower end of the fork 23a is hinged with the frame 3, and a tension spring 24a is arranged between the fork 23a and the frame 3, and the tension spring 24a produces tension to the fork 23a under normal conditions. The pulling force of the wheel 6a in the working position; the swing rod 23a is provided with a pressing rod 15a for pressing down the swing rod 23a. Its working principle is: when it is necessary to replace the abrasive belt 8a, press down the pressing lever 15a, so that the swing lever 23a drives the tensioning wheel 6a to move downward, and the arc-shaped surface of the profiling grinding head 7a, the power wheel 5a and the tensioning wheel 6a move downward. The perimeter of the triangle formed by the tight wheel 6a dwindles, and now the abrasive belt 8a can be loaded or taken out. After reinstalling the abrasive belt 8a, the pressing lever 15a is released, and under the tension spring 24a effect, the fork 23a returns to the working position. The abrasive belt 8a is tensioned (the dotted line part in Fig. 7 shows the structure after the tensioning wheel 6b moves downward in the second processing assembly). The above-mentioned process of replacing the abrasive belt 8a can be completed by one worker, which is convenient and quick.

Referring to Figures 2 to 5, in the present utility model, the profiling grinding head 7a is divided into multiple types according to the radius of the arc-shaped surface, and the length of the abrasive belt 8a is fixed; for each profiling grinding head 7a , the length of a circle along the circular path of the abrasive belt 8a is a fixed value, and this length is equal to the length of the abrasive belt 8a. For example, as described in the background technology, the radii of the large-radius arc surface on the ribs are divided into four types: R300mm, R450mm, R600mm and R800mm, so four types of profiling grinding heads are set accordingly. Since there are two sets of processing components in this embodiment, two types of profiling grinding heads are configured in each set of processing components. Like this, no matter which kind of profiling grinding head 7a is used, along the encircling path of abrasive belt 8a, the length of a week around the arc-shaped surface of this profiling grinding head 7a, power wheel 5a and tension pulley 6a all is not fixed. Change, this length is equal to the length of abrasive belt 8a, can use the abrasive belt 8a of same specification like this for different profiling grinding head 7a, so that when processing the large-radius circular arc surface on the rib of different radius, only The profiling grinding head 7a needs to be replaced, and the abrasive belt 8a does not need to be replaced. In order to achieve the above-mentioned purpose, the setting positions of the positioning holes on the profiling grinding head 7a and the bolts 17a need to be determined through calculation, so that as long as the positioning holes in the profiling grinding head 7a are inserted into the positioning shaft 16a, and the bolts are tightened 17a, the above requirements can be met.

Referring to Fig. 5, the workbench 4a is connected with the frame 3 in the following manner: the frame 3 is provided with a support seat 13a, the side of the support seat 13a is fixedly connected with the frame 3, and the top is provided with an adjustment backing plate 22a, One end of the workbench 4a is hinged on one end of the adjustment backing plate 22a through the hinge shaft 21a, an adjustment bolt 19a is arranged between the other end of the workbench 4a and the other end of the adjustment backing plate 22a, and one end of the adjustment bolt 19a supports On the adjustment backing plate 22a, the other end stretches into the adjustment hole of the workbench 4a, the adjustment bolt 19a is provided with a nut, and the nut is compressed on the bottom surface of the workbench 4a. In this way, one end corresponding to the workbench 4a is supported on the nut, and by rotating the nut, the workbench 4a can be rotated around the hinge shaft 22a, thereby fine-tuning the working space between the profiling grinding head 7a and the workbench 4a , to adapt to the processing of ribs of different thicknesses. One side of the workbench 4a is provided with a guide plate 20a. During the processing, in order to improve efficiency, the operator usually arranges multiple ribs 1 side by side for one-time processing; after setting the guide plate 20a, the worker can place multiple ribs 1 1, the outer one is close to the guide plate 20a, and is fed forward along the guide plate 20a, so that not only can the multiple ribs 1 be close to each other, but also the feeding process will not be shifted due to the grinding force , can not only improve the processing efficiency, but also ensure the processing quality.

The workbench 4a is provided with a chip discharge device, which includes a cover covering the profiling wheel 7a, a suction duct connected to the cover, and a fan connected to the suction duct. The purpose of setting up the debris discharge device is that a lot of debris will be generated due to the grinding of the ribs during the processing. If these debris are not collected uniformly, the debris will fly everywhere and pollute the working environment. By setting the debris discharge device, These debris are sucked up and disposed of centrally to prevent environmental pollution. The role of the outer cover is to collect debris and prevent it from flying, and the role of the suction duct and fan is to discharge and collect these debris. Because the following of the profiling wheel 7a is the working space for pushing in the rib 1, the outer cover cannot extend to the working space, that is, the working space is communicated with the external space, so that part of the debris will also come from the outer space during processing. This place is blown into the external space. In order to solve this problem, another suction air duct is connected to the fan, and the inlet of the suction air duct is facing the working space.

Referring to Figures 2 to 4, the structure of the second set of processing components in this embodiment is exactly the same as that of the first set of processing components, including a workbench 4b, a power wheel 5b, a tensioning wheel 6b, a profiling grinding head 7b, and an abrasive belt 8b, power unit 10b, guide wheel 9b, beam 11b and graphite cloth sheet 12b, etc. Among the two sets of processing components, the second set of processing components and the first set of processing components are arranged front and back, and on the front view (ie, Figure 2), the two sets of processing components are symmetrically arranged left and right, so that the two sets of processing components in the two sets of processing components Two workbenches 4a, 4b are arranged on the left and right sides, and the two abrasive belts 8a, 8b in the two sets of processing assemblies are arranged in a cross shape before and after. Each set of processing components can independently complete the processing of the large-radius arc surface on the rib, which is beneficial to improve efficiency and save space; only need to use the space of one processing component to set up two sets of processing components, making full use of Space; workers operate on the left and right sides respectively without affecting each other. As long as two sets of processing components are selected with two profiling grinding heads with different arc-shaped surface radii, large-radius arcs on ribs with two different radii can be processed. Surface, make full use of space, improve work efficiency.

In the utility model, when the abrasive belt 8a is working, if the relative position of the arc-shaped surface of the power wheel 5a, the tension wheel 6a and the profiling grinding head 7a in the width direction is fixed, then the large radius circle on the rib During the processing of the arc surface, it is always in contact with an area in the length direction of the abrasive belt 8a to form a linear grinding track, while other areas of the abrasive belt 8a are not used, and the abrasive belt 8a is easily worn and has a short service life. In order to solve this technical problem, the tension wheel 6a is connected with a swing mechanism for urging the abrasive belt 8a to slide back and forth on the tension wheel 6a. Here, the tension wheel 6b in the second set of processing components is taken as an example to illustrate the composition of the swing mechanism.

7 to 9, the swing mechanism includes a driving motor 25b, an eccentric wheel 26b connected to the output shaft of the driving motor 25b, a connecting rod 27b and a swing arm 28b, wherein one end of the connecting rod 27b is hinged to the eccentric wheel 26b, and the other end It is hinged with one end of the swing arm 28b; the tensioning wheel 6a is provided with a swing bushing 31b, a bearing 32b is arranged between the swinging bushing 31b and the tensioning wheel 6a, and a fixed shaft 29b is arranged in the swinging bushing 31b There is a swing gap between the fixed shaft 29b and the swing bushing 31b, and the end of the fixed shaft 29b is fixedly connected to the frame 3; a swing pin 30b is pierced between the fixed shaft 29b and the swing bush 31b, The axis of the swing pin 30b is perpendicular to the axis of the fixed shaft 29b; the other end of the swing arm 28b is fixedly connected to the swing sleeve 31b; the outer surface of the tension wheel 6a is drum-shaped (tension wheel 6a The outer surface of the rubber layer is a layer of rubber, that is, the outer surface of the rubber layer is drum-shaped). Its working principle is: the drive motor 25b drives the swing arm 28b and the swing bush 31b to swing back and forth around the swing pin 30b through the eccentric wheel 26b and the connecting rod 27b, and the swing gap between the fixed shaft 29b and the swing bush 31b is the swing bush. The swing of 31b provides space, and the tension wheel 6b swings in the horizontal plane with the swing of the swing axle sleeve 31b. Since the outer surface of the tension wheel 6b is drum-shaped, the abrasive belt 8b will run along the width of the tension wheel 6a like this. The direction slides back and forth, so that the abrasive belt 8a also slides along the width direction on the arc-shaped surface of the power wheel 5b and the profiling grinding head 7b, so that different regions of the abrasive belt 8b can be used to make large The radius arc surface is processed to prevent the abrasive belt 8b from wearing out too quickly and prolong the service life of the abrasive belt 8b. Simultaneously, because the abrasive belt 8b continuously slides back and forth, reticulated grinding traces will be formed on the large-radius circular arc surface of the rib 1, which is conducive to improving the surface processing quality; and this movement track of the abrasive belt 8b also has It is beneficial to its self-sharpening and heat dissipation, and improves the use effect and service life of the abrasive belt 8b.

The above is a preferred implementation of the utility model, but the implementation of the utility model is not limited by the above content, and any other changes, modifications, substitutions, combinations, Simplification should be equivalent replacement methods, all of which are included in the protection scope of the present utility model.

Claims (10)

1. The processing equipment of large-radius arc surface on a kind of piano rib, it is characterized in that, comprise frame, workbench, power wheel, tensioning wheel, profiling grinding head, emery belt and power unit, wherein, described power The device is connected with the power wheel, the profiling grinding head is fixed on the frame, and the profiling grinding head has an arc-shaped surface; the abrasive belt wraps around the power wheel, tensioning wheel and profiling grinding head to form a Triangular shape; a processing space is formed between the profiling grinding head and the workbench for allowing the end of the rib to be pushed in; the outer diameter of the abrasive belt on the arc-shaped surface of the profiling grinding head is larger Radius arcs have equal radii. 2. the processing equipment of large-radius arc surface on the piano rib according to claim 1, it is characterized in that, described processing equipment comprises two sets of processing assemblies, and each set of processing assemblies comprises described workbench, power wheel, Tension pulleys, profiling grinding heads, abrasive belts and power units. 3. The processing equipment of the large-radius arc surface on the piano rib according to claim 2, the two sets of processing assemblies are arranged front and rear, and the two workbenches in the two sets of processing assemblies are arranged on the left and right sides, and the two sets of processing assemblies The two abrasive belts in the assembly are arranged one behind the other in a cross shape. 4. The processing equipment for large-radius arc surface on piano ribs according to claim 1, characterized in that graphite cloth is arranged on the arc-shaped surface of the profiling grinding head. 5. The processing equipment of large-radius arc surface on the piano rib according to claim 1, wherein the profiling grinding head is provided with a guide wheel at one end corresponding to the tensioning wheel; when working along the abrasive belt In the direction of movement, the abrasive belt goes around the arc-shaped surface of the profiling grinding head and the guide wheel in turn. 6. the processing equipment of large-radius arc surface on piano rib according to claim 1, is characterized in that, described profiling grinding head is divided into multiple according to the difference of the radius of arc-shaped surface, and the length of described emery belt Fixed: For each type of profiling grinding head, the length of the circle around the path of the abrasive belt is a fixed value, and the length is equal to the length of the abrasive belt. 7. The processing equipment for the large-radius arc surface on the piano rib according to claim 6, characterized in that, the connection structure between the profiling grinding head and the frame is: the frame is provided with a The fixed connection point of the grinding head connection, the fixed connection point is provided with a positioning shaft, each profiling grinding head is provided with a positioning hole, and the positioning shaft is inserted into the positioning hole; the side of the profiling grinding head The side and the frame are fixedly connected by bolts. 8. The processing equipment for the large-radius arc surface on the piano rib according to claim 1, characterized in that, the tensioning wheel is provided with a tensioning device, and the tensioning device is: the tensioning wheel is arranged on On the swing rod, the lower end of the swing rod is hinged with the frame, and a tension spring is arranged between the swing rod and the frame, and the tension spring generates a pulling force on the swing rod to make the tensioning wheel be in the working position under normal conditions; the swing rod There is a pressing rod for pressing down the swing rod on the top. 9. The processing equipment for the large-radius arc surface on the piano rib according to claim 1, characterized in that, the tension wheel is connected with a swing mechanism for impelling the abrasive belt to slide back and forth on the tension wheel, the The swing mechanism includes a driving motor, an eccentric wheel connected to the output shaft of the driving motor, a connecting rod and a swing arm, wherein one end of the connecting rod is hinged to the eccentric wheel, and the other end is hinged to one end of the swing arm; Swing bushing, a bearing is arranged between the swinging bushing and the tensioning wheel, a fixed shaft is arranged inside the swinging bushing, there is a swing gap between the fixed shaft and the swinging bushing, the end of the fixed shaft and the frame Fixed connection; a swing pin is passed between the fixed shaft and the swing bush, the axis of the swing pin is perpendicular to the axis of the fixed shaft; the other end of the swing arm is fixedly connected to the swing bush. 10. The processing equipment for large-radius arcuate surfaces on piano ribs according to claim 1, wherein the power device includes a motor, and the motor is connected to the power wheel through a belt transmission mechanism.

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