WO2014146376A1

WO2014146376A1 - Concentric and reversible mounting apparatus for dual saw blades and dual saw blade cutting machine having mounting apparatus

Info

Publication number: WO2014146376A1
Application number: PCT/CN2013/078348
Authority: WO
Inventors: 陈诗歌; 宋希万
Original assignee: 宁波德丰动力科技有限公司
Priority date: 2013-03-20
Filing date: 2013-06-28
Publication date: 2014-09-25
Also published as: CN203228048U

Abstract

A concentric and reversible mounting apparatus for dual saw blades and a dual saw blade cutting machine having the mounting apparatus. The mounting apparatus comprises an outer mounting bushing (13) used for mounting a first saw blade (3), an inner mounting bushing (17) used for mounting a second saw blade (7) and provided in the outer mounting bushing, and a bearing (14) mounted between the outer mounting bushing and the inner mounting bushing. The bearing (14) and the outer mounting bushing, and the bearing and the inner mounting bushing are axially fixed together by means of an axial positioning apparatus. The axial gap between the dual saw blades is secured thereby. A transmission gear (6) of the dual saw blade cutting machine is coupled with the outer mounting bushing and a saw blade shaft (8) of the cutting machine is coupled with the inner mounting bushing, one of the above-mentioned two couplings is achieved by means of a transmission means permitting axial play. The mounting apparatus can ensure an accurate and stable saw blade clearance, and convenient mounting and use.

Description

Concentric reversal double saw blade mounting device

And double saw blade cutting machine with the same

The utility model relates to a double saw blade cutting machine, and more particularly to a concentric reverse double saw blade mounting structure in a double saw blade cutting machine. Background technique

Concentric reversing double saw blade cutting machine can cut common engineering materials: for example, wood, rubber, steel, aluminum, copper, etc., so it is widely adaptable. Moreover, it has the advantages of small impact during the cutting process, small vibration, small heat deformation of the workpiece, and the like, and thus has been rapidly popularized.

In the existing double saw blade cutting machine, the mounting structure of the two saw blades has various solutions, and most of them adopt a mounting structure which is respectively fixedly connected with the transmission member, as shown in Fig. 1. This mounting structure includes an outer mounting bushing 1 for mounting the first saw blade and an inner mounting bushing 2 for mounting the second saw blade, the axial clearance between the saw mounting faces of the two being 8. The inner mounting bushing 2 is disposed inside the outer mounting bushing 1 and the two rotate in opposite directions to drive the double saw blade to rotate in the opposite direction. The outer mounting bushing 1 is fixedly coupled to the drive gear 6 to receive the rotational motion it transmits, and the inner mounting bushing 2 is fixedly coupled to the saw blade shaft 8 to receive the reverse rotational motion thereof. The drive gear 6 is mounted on the saw blade shaft 8 via a bearing 68. It can be seen that the mounting bushings of the two saw blades are indirectly linked by multiple parts. Therefore, the actual axial clearance S of the final saw blade is determined by a sequence of parts such as the outer mounting bushing 1, the transmission gear 6, the bearing 68, the saw blade shaft 8, and the inner mounting bushing 2.

Since the mounting bushings of the two saw blades are not directly related, there are too many factors that affect the accuracy and stability of the actual axial clearance S of the saw blade, including the machining accuracy of the above multiple parts and the errors during the installation process. The blade gap S is not accurate enough, and the wear caused by the use and slight changes in the mounting position may cause the blade gap S to be insufficiently stable. Therefore, it is difficult to ensure accurate and appropriate blade gap in production, and it is difficult to ensure the stability of the blade gap during use, which has a serious impact on the processing quality of the workpiece and the service life of the double saw blade cutter. .

In order to ensure the accurate gap between the double saw blades, CN202360580U uses a special flange bearing to effectively combine the two lining plates on one flange bearing, which solves the problem of the blade gap well, but this special flange Bearing manufacturing costs are high. CN102476221A adopts a method of providing steel balls between the double saw blades to ensure the gap between the saw blades, but this method requires an annular groove on the saw blade to accommodate the steel balls, which also increases the cost because of the need to manufacture annular grooves. Special saw blade. Moreover, this method can only ensure that the gap between the saw blades is not less than a certain value, but it cannot prevent the gap from increasing due to various factors mentioned above. Utility model content

In view of the above situation, the utility model designs a concentric reversing double saw blade mounting structure, which can ensure accurate and stable saw blade gap, and can be installed and used conveniently and economically and reliably. At the same time, the utility model also designs a double saw blade cutting machine adopting the above installation structure.

The concentric reverse double saw blade mounting device of the present invention comprises: an outer mounting bushing for mounting a first saw blade, an inner mounting bushing for installing a second saw blade disposed inside the outer mounting bushing, and A bearing mounted between the outer mounting bushing and the inner mounting bushing. The bearing and the outer mounting bushing and between the bearing and the inner mounting bushing are axially fixed to each other by an axial positioning device. The axial positioning means can be realized by a combination of shoulders and/or retaining rings provided on the outer mounting bushing or the inner mounting bushing.

In the double saw blade cutting machine of the present invention, the outer mounting bushing is coupled with a transmission gear of the cutting machine, and the inner mounting bushing is coupled with a saw blade shaft of the cutting machine, wherein One of the above two joints is a coupling achieved by a transmission that allows axial play. DRAWINGS

Figure 1 shows a dual saw blade mounting structure that is more commonly used in the prior art.

Fig. 2 shows a preferred embodiment of the double saw blade cutting machine of the present invention in which a concentric reverse double saw blade mounting device unique to the present invention is employed.

Figure 3 shows in detail the concentric reversal double saw blade mounting device of the embodiment of Figure 2 in detail. Figure 4 shows another embodiment of the concentric reversing double saw blade mounting apparatus of the present invention.

Figure 5 shows a further implementation of the concentric reversing double saw blade mounting device of the present invention example.

Figure 6 shows another embodiment of the transmission of the outer mounting bushing and the transmission gear of the cutting machine in the concentric reverse double saw blade mounting device of the present invention, and the saw blade shaft of the inner mounting bushing and the cutting machine Another way to connect.

Fig. 7 shows still another embodiment of the transmission of the outer mounting bushing and the transmission gear of the cutting machine in the concentric reverse double saw blade mounting device of the present invention. detailed description

The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

First, the parts mainly included in the double saw blade mounting device of the present invention will be described.

Fig. 2 shows a preferred embodiment of the double saw blade cutter of the present invention from the overall structure, in which a concentric reverse double saw blade mounting device unique to the present invention is employed. As can be seen from the figure, the mounting device mainly comprises: an outer mounting bushing 13, an inner mounting bushing 17, and an axial direction sandwiched between the outer mounting bushing 13 and the inner mounting bushing 17 (based on the axis of the saw blade shaft 8) The positioning device (including a plurality of embodiments, detailed below) is a fixed bearing 14.

Referring now to Figure 2, the connection relationship between the dual saw blade mounting device of the present invention and other components in the cutting machine will be described.

The outer mounting bushing 13 is coupled to the drive gear 6 of the cutter, and the inner mounting bushing 17 is coupled to the saw blade shaft 8 of the cutter. Since the utility model fixes the gap between the two saw blades by fixing the axial relative positions between the inner and outer two mounting bushings, there is only one place in the above two joints to allow the axial travel. The coupling of the gap drive.

In the preferred embodiment shown in Figure 2, the coupling of the inner mounting bushing 17 to the saw blade shaft 8 of the cutting machine is an axially fixed coupling, and the coupling of the outer mounting bushing 13 to the drive gear 6 of the cutting machine is passed The coupling that allows the axial clearance of the transmission. Specifically, the outer mounting bushing 13 is engaged with the driving pin 6 by the driving pin 11 into the opening groove 60 of the transmission gear 6, thereby being screwed with the transmission gear 6 to receive the rotational motion from the transmission gear 6. A gap is left between the driving pin 11 and the opening groove 60 in the transmission gear 6, as a clearance for accommodating the outer mounting bushing 13 to move up and down in the axial direction. In order to prevent such a play from causing a collision between the parts, a cushioning member such as a rubber washer or a wave spring pad 36 may be disposed between the outer mounting bushing 13 and the bearing above it. In another embodiment of the transmission-enabled transmission shown in Fig. 6, the outer mounting bushing 13 is provided with a transmission key 21 that cooperates with a keyway (not shown) on the transmission gear 6. In still another embodiment of the transmission-enabled transmission shown in Figure 7, the outer mounting bushing 13 is provided with a slot 20 that mates with a key (not shown) on the drive gear 6. Both of the above are alternative embodiments of the transmission that allows for axial play.

It will be appreciated that the inner mounting bushing 17 can also be mounted to the saw blade shaft 8 of the cutting machine via the drive key 18, as shown in Figures 6 and 7.

In the preferred embodiment of Fig. 2, the first saw blade 3 is fixed to the outer mounting bushing 13 by the saw blade pin 16; the second saw blade 7 is pressed against the inner mounting bushing 17 by the pressing screw 9 and the saw blade pressing plate 10. Upper, the frictional force generated by the pressing is fixed with respect to the inner mounting bushing 17 and the saw blade shaft 8. It can be understood that if the working object of the cutting machine is a soft material such as wood or plastic, it is sufficient to fix the second saw blade 7 by friction. For a hard material such as metal or stone, it can be used as shown in the figure. The blade pin 19 shown in Figs. 6 and 7 fixes the second saw blade 7.

Referring to Figures 3-5, the connection between the internal parts of the dual saw blade mounting device of the present invention will be described.

As shown in FIG. 3, the inner mounting bushing 17 is disposed within the outer mounting bushing 13, and the bearing 14 is sandwiched between the inner mounting bushing 17 and the outer mounting bushing 13 to allow the outer mounting bushing 13 and the inner mounting bushing. The 17 is relatively rotated and axially fixed relative to the outer mounting bushing 13 and the inner mounting bushing 17 by axial positioning means. In the embodiment shown in FIG. 3, the axial positioning means comprises a hole retaining ring 15 on the outer mounting bushing 13 (apparently fixed in the inner ring groove of the outer mounting bushing 13) and a shoulder 131 and an inner mounting bushing. The shaft retaining ring 12 on the 17 (apparently fixed in the outer ring groove of the inner mounting bushing 17) and the shoulder 171. The above four components allow the bearing 14 to be axially fixed completely with respect to the outer mounting bushing 13 and the inner mounting bushing 17, and the axial relative position between the outer mounting bushing 13 and the inner mounting bushing 17 is fixed.

Since the first saw blade 3 and the second saw blade 7 are mounted on the outer mounting bushing 13 and the inner mounting bushing 17, respectively, the axial relative positions between the two saw blades, that is, the gap S between them - - It was fixed in this way. The advantage of this method is that in order to ensure the accuracy and stability of the gap S, it is only necessary to ensure the dimension A on the outer mounting bushing 13 and the dimension B on the inner mounting bushing 17 during the machining process, wherein the dimension A is The axial distance between the shoulder 131 and the second blade mounting surface 132, the dimension B is the axial distance between the shoulder 171 and the first blade mounting surface 172. The reason is that the size B plus the axial height H of the bearing 14 minus the dimension A is equal to the blade gap S, and the height H is constant, so that the precise and stable blade gap S is completely ensured as long as the dimensions A and B are ensured.

As described in the background section, in the prior art, there are too many factors that affect the accuracy and stability of the blade gap S, and the structure of the present invention excludes the influence of these factors, and only depends on the processing of the sizes A and B. Accuracy, which minimizes the factors affecting the blade gap S. Those skilled in the art will appreciate that it is relatively simple and easy to ensure the machining accuracy of dimensions A and B without incurring additional costs. Due to the presence of the axial play described above, the two saw blades together with the two mounting bushings and the bearing will form an integral assembly that is axially fixed to each other, this integral assembly with the saw blade shaft 8 and the transmission gear 6 One axial fixed connection is coupled to the other to maintain axial play, and is not affected by the influence of the two joints on the axial position at the same time, and the axial dimension error and installation error of the plurality of parts are accommodated by the play. Accumulation, thereby avoiding the influence on the blade gap S. Therefore, the present invention achieves precise and stable control of the blade gap S with a simple and low-cost technical solution.

It will be appreciated that in addition to the preferred embodiment illustrated in Figure 2 and Figure 3, the axial positioning device can take various alternative embodiments. For example, in the embodiment of FIG. 4, the inner mounting bushing 17 is not provided with a combination of a shaft retaining ring and a shoulder, but two shaft retaining rings are provided, which can also limit the bearing 14 and the inner mounting bushing. Axial relative position between 17. In the embodiment of Fig. 5, a hole in the outer mounting bushing 13 is changed by a combination of a retaining ring and a shoulder to two retaining rings, and the bearing 14 and the outer mounting bushing 13 can also be restrained. Axial relative position. It is conceivable that the use of four retaining rings all without the shoulder is also an alternative embodiment of the axial positioning device. Those skilled in the art will appreciate that in these alternative embodiments, the calibration of dimensions A and B will vary accordingly.

Many modifications and other embodiments of the invention will be apparent to those skilled in the <RTIgt; Therefore, it is intended that the invention that the invention Although specific terms are employed herein, they are used for general and descriptive purposes only and not limiting.

Claims

Claim

1. A concentric reversing double saw blade mounting device, comprising:

An outer mounting bushing (13) for mounting the first saw blade (3);

An inner mounting bushing (17) for mounting the second saw blade (7) and disposed in the outer mounting bushing (13);

The mounting device further includes:

a bearing (14) mounted between the outer mounting bushing (13) and the inner mounting bushing (17) to allow the outer mounting bushing (13) and the inner mounting bushing (17) Relatively rotated, and axially fixed relative to the outer mounting bushing (13) and the inner mounting bushing (17) by axial positioning means (12, 15, 131, 171).

2. The concentric reverse double saw blade mounting apparatus according to claim 1, wherein the axial positioning means comprises a hole retaining ring (15) on the outer mounting bushing (13).

3. The concentric reversal double saw blade mounting apparatus according to claim 2, wherein the axial positioning device further comprises a shoulder (131) on the outer mounting bushing (13).

4. The concentric reverse double saw blade mounting apparatus according to claim 3, wherein the axial positioning device further comprises a shaft retaining ring (12) on the inner mounting bushing (17).

The concentric reverse double saw blade mounting device according to claim 3 or 4, wherein the axial positioning device further comprises a shoulder (171) on the inner mounting bushing (17).

6. A concentric reverse double saw blade mounting apparatus according to claim 1, wherein the first saw blade (3) is mounted to the outer mounting bushing (13) by a saw blade pin (16).

7. Concentric reverse double saw blade mounting device according to claim 6, characterized in that the second saw blade (7) is mounted to the inner mounting bushing (17) by a saw blade pin (19).

8. The concentric reverse double saw blade mounting device according to claim 6, wherein the second saw blade (7) is mounted to the inner mounting bushing by a pressing screw (9) and a blade pressing plate (10) (17) Upper.

A double saw blade cutting machine having the concentric reverse double saw blade mounting device according to any one of claims 1-8, the outer mounting bushing (13) and the transmission gear of the cutting machine

(6) coupling, the inner mounting bushing (17) is coupled to the saw blade shaft (8) of the cutting machine, wherein one of the two joints is realized by a transmission allowing axial play Join.

10. The double saw blade cutter of claim 9, wherein the outer mounting bushing (13) is coupled to the drive gear (6) of the cutter by a transmission that allows axial play

(11, 60, 21, 20) achieved coupling, the transmission (11, 60, 21, 20) allowing axial play includes a drive pin that cooperates with an open slot (60) on the drive gear (6) (11), a transmission key (21) that cooperates with a keyway on the transmission gear (6), or a groove (20) that engages with a key on the transmission gear (6).