Bidirectional rotation limiting mechanism and scribing machine

Abstract

The utility model discloses a bidirectional rotation limit mechanism and a scribing machine, the bidirectional rotation limit mechanism comprises a mounting support and a slide block, the mounting support is provided with a first limit switch and a second limit switch, and the first limit switch and the second limit switch are used for respectively identifying two rotation limit positions of a bidirectional rotation table. The sliding block is arranged on the installation support in a sliding mode, the sliding block is provided with a limiting trigger baffle and a limiting check block used for being poked by the rotary limiting part, and when the limiting check block is poked by the rotary limiting part, the limiting check block drives the sliding block and the limiting trigger baffle to slide between the first limiting switch and the second limiting switch. When the sliding block slides to the first limiting position, the limiting trigger baffle triggers the first limiting switch to achieve recognition of the first rotating limiting position of the bidirectional rotating table, and when the sliding block slides to the second limiting position, the limiting trigger baffle triggers the second limiting switch to achieve recognition of the second rotating limiting position of the bidirectional rotating table.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical automation, and more specifically to a bidirectional rotation limiting mechanism and a dicing machine. Background Art

[0002] At present, dicing machines are widely used in precision dicing of materials such as semiconductor wafers, LED (Light Emitting Diode) wafers, lead frames, printed circuit boards, filters, sapphire glass, ceramic sheets, etc. In the dicing process, the workpiece is usually loaded and mounted on a dicing table, wherein the dicing table is mounted on a rotating table for switching cutting channels.

[0003] However, in order to ensure the accuracy of the dicing process, the relative position between the blade on the dicing machine and the workpiece needs to be properly adjusted. In order to achieve effective adjustment, the rotation angle of the bidirectional rotary table needs to be effectively limited to avoid damage to the relevant parts on the dicing machine and the workpiece. The prior art uses a program to control the rotation of the bidirectional rotary table, but this method is prone to cumulative errors after long-term operation, and the rotation limit effect of the bidirectional rotary table is poor.

[0004] Therefore, how to effectively limit the rotation of the bidirectional rotating table has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] In view of this, an object of the present invention is to provide a bidirectional rotation limiting mechanism to effectively limit the rotation of a bidirectional rotating table.

[0006] Another object of the present utility model is to provide a dicing machine including the above-mentioned bidirectional rotation limiting mechanism.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A bidirectional rotation limiting mechanism is used for limiting the rotation of a bidirectional rotating platform, wherein a rotation limiting part is provided on the bidirectional rotating platform, comprising:

[0009] A mounting bracket, wherein a first limit switch and a second limit switch are provided on the mounting bracket, wherein the first limit switch and the second limit switch are used to respectively identify two rotation limit positions of the bidirectional rotating table;

[0010] A slider is slidably arranged on the mounting bracket, and a limit trigger baffle and a limit block used to be moved by the rotation limit portion are arranged on the slider. When the slider slides to the first limit position, the limit trigger baffle triggers the first limit switch, and when the slider slides to the second limit position, the limit trigger baffle triggers the second limit switch.

[0011] Optionally, in the above-mentioned bidirectional rotation limiting mechanism, it also includes:

[0012] A first tension spring, one end of which is connected to the limit trigger baffle, and the other end of which is arranged on the first end of the mounting bracket;

[0013] A second tension spring has one end connected to the limit trigger baffle and the other end arranged at the second end of the mounting bracket. The first tension spring and the second tension spring are used to pull the limit trigger baffle to reset when the rotation direction of the bidirectional rotating table is switched.

[0014] Optionally, in the above-mentioned bidirectional rotation limiting mechanism, a tension spring fixing piece is provided on the limit trigger baffle, and the first tension spring and the second tension spring are connected to the limit trigger baffle through the tension spring fixing piece.

[0015] Optionally, in the above-mentioned bidirectional rotation limiting mechanism, the tension spring fixing member is provided with a plurality of first hanging holes for hanging the first tension spring on a side facing the first tension spring, and is provided with a plurality of second hanging holes for hanging the second tension spring on a side facing the second tension spring;

[0016] The first hanging holes and the second hanging holes correspond to each other one by one and are symmetrically arranged relative to the axis of the tension spring fixing member.

[0017] Optionally, in the above-mentioned bidirectional rotation limiting mechanism, a first bracket is provided on the mounting bracket, the first tension spring is connected between the first bracket and the tension spring fixing member, and the first tension spring is arranged along the extension direction of the mounting bracket; and / or,

[0018] The mounting bracket is provided with a second bracket, the second tension spring is connected between the second bracket and the tension spring fixing member, and the second tension spring is arranged along the extending direction of the mounting bracket.

[0019] Optionally, in the above-mentioned bidirectional rotation limit mechanism, a sliding guide rail is provided on the mounting bracket, the sliding guide rail is located between the first limit switch and the second limit switch, and the slider is slidably provided on the sliding guide rail;

[0020] Limiting parts for limiting the sliding of the slider are arranged at both ends of the sliding guide rail.

[0021] Optionally, in the above-mentioned bidirectional rotation limiting mechanism, the mounting bracket is provided with an avoidance groove for avoiding the movement of the limit block.

[0022] Optionally, in the above-mentioned bidirectional rotation limiting mechanism, first elastic buffer pads are provided at both ends of the limiting block along the sliding direction of the slider; and / or,

[0023] Along the sliding direction of the sliding block, second elastic buffer pads are arranged on both side walls of the avoidance groove.

[0024] Optionally, in the above-mentioned bidirectional rotation limit mechanism, the first limit switch and the second limit switch are both photoelectric sensors.

[0025] A dicing machine comprises the above-mentioned bidirectional rotation limiting mechanism.

[0026] The bidirectional rotation limit mechanism provided by the utility model is used for limiting the rotation of the bidirectional rotating table. The bidirectional rotating table is provided with a rotation limit part. The bidirectional rotation limit mechanism includes a mounting bracket and a slider. The mounting bracket is provided with a first limit switch and a second limit switch. The first limit switch and the second limit switch are used to respectively identify the two rotation limit positions of the bidirectional rotating table. The slider is slidably arranged on the mounting bracket, and a limit trigger baffle and a limit block for being moved by the rotation limit part are arranged on the slider. When the limit block is moved by the rotation limit part, the limit block drives the slider and the limit trigger baffle to slide between the first limit switch and the second limit switch. When the slider slides to the first limit position, the limit trigger baffle triggers the first limit switch to realize the identification of the first rotation limit position of the bidirectional rotating table. When the slider slides to the second limit position, the limit trigger baffle triggers the second limit switch to realize the identification of the second rotation limit position of the bidirectional rotating table.

[0027] When the bidirectional rotary table rotates a certain angle in the first direction, the rotation limit part contacts the first side of the limit stopper, and the bidirectional rotary table continues to rotate and pushes the slider to drive the limit stopper and the limit trigger baffle to slide in the direction where the first limit switch is located, until the first limit switch is triggered by the limit trigger baffle and outputs a signal, which means that the bidirectional rotary table has reached the rotation limit position (first rotation limit position) in this direction, and the bidirectional rotary table can stop rotating or switch the rotation direction. If the rotation direction is switched, the bidirectional rotary table rotates in a second direction opposite to the first direction, and after the bidirectional rotary table continues to rotate in the second direction until it contacts the second side of the limit stopper, the bidirectional rotary table pushes the slider to drive the limit stopper and the limit trigger baffle to slide in the direction where the second limit switch is located, until the second limit switch is triggered by the limit trigger baffle and outputs a signal, which means that the bidirectional rotary table has reached the rotation limit position (second rotation limit position) in this direction, and the bidirectional rotary table can stop rotating or switch the rotation direction.

[0028] Compared with the prior art, the bidirectional rotation limit mechanism provided by the utility model realizes the effective limitation of the rotation angle of the bidirectional rotating table. It has a simple and reliable structure, is easy to operate, and is not prone to cumulative errors after long-term operation. It can effectively prevent damage to related parts and workpieces on the dicing machine.

[0029] The dicing machine provided by the utility model includes the above-mentioned bidirectional rotation limiting mechanism, so it also has the above-mentioned structure and beneficial effects, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a schematic diagram of the installation structure of the bidirectional rotation limiting mechanism disclosed in the embodiment of the utility model at a first angle;

[0032] Figure 2 It is a schematic diagram of the installation structure of the bidirectional rotation limiting mechanism disclosed in an embodiment of the utility model at a second angle.

[0033] Among them, 100 is a bidirectional rotation limit mechanism, 110 is a mounting bracket, 120 is a sliding guide rail, 121 is a slider, 130 is a limit stopper, 140 is a limit trigger baffle, 141 is a first limit switch, 142 is a second limit switch, 143 is a first tension spring, 144 is a second tension spring, and 145 is a tension spring fixing member;

[0034] 200 is a bidirectional rotating table, and 210 is a rotating mounting base. DETAILED DESCRIPTION

[0035] The core of the utility model is to disclose a bidirectional rotation limiting mechanism to effectively realize the rotation limiting of the bidirectional rotating table.

[0036] The core of the utility model is to disclose a dicing machine including the above-mentioned bidirectional rotation limiting mechanism.

[0037] The following is an explanation of the embodiments with reference to the accompanying drawings. In addition, the embodiments shown below do not limit the contents of the utility model described in the claims. In addition, the entire contents of the construction represented by the following embodiments are not limited to those necessary as solutions to the utility model described in the claims. It should be noted that, for ease of description, only the parts related to the relevant application are shown in the accompanying drawings. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other.

[0038] Combination Figure 1 The bidirectional rotation limiting mechanism 100 disclosed in the embodiment of the utility model is used to limit the rotation of the bidirectional rotating platform 200. The bidirectional rotating platform 200 is provided with a rotation limiting part. The bidirectional rotation limiting mechanism 100 includes a mounting bracket 110 and a slider 121.

[0039] The mounting bracket 110 is provided with a first limit switch 141 and a second limit switch 142, which are used to respectively identify the two rotation limit positions of the bidirectional rotating table 200. The slider 121 is slidably arranged on the mounting bracket 110, and a limit trigger baffle 140 and a limit stopper 130 for being moved by a rotation limit portion are arranged on the slider 121. When the limit stopper 130 is moved by the rotation limit portion, the limit stopper 130 drives the slider 121 and the limit trigger baffle 140 to slide between the first limit switch 141 and the second limit switch 142.

[0040] When the slider 121 slides to the first extreme position, the limit trigger baffle 140 triggers the first limit switch 141 to identify the first rotation limit position of the bidirectional rotating table 200. When the slider 121 slides to the second extreme position, the limit trigger baffle 140 triggers the second limit switch 142 to identify the second rotation limit position of the bidirectional rotating table 200.

[0041] When the bidirectional rotating table 200 rotates a certain angle in the first direction, the rotation limit portion abuts against the first side of the limit block 130, and the bidirectional rotating table 200 continues to rotate and pushes the slider 121 to drive the limit block 130 and the limit trigger baffle 140 to slide in the direction of the first limit switch 141, until the first limit switch 141 is triggered by the limit trigger baffle 140 and outputs a signal, which indicates that the bidirectional rotating table 200 has reached the rotation limit position (first rotation limit position) in this direction, and the bidirectional rotating table 200 can stop rotating or switch the rotation direction. If the rotation direction is switched, the bidirectional rotating table 200 rotates in a second direction opposite to the first direction. After the bidirectional rotating table 200 continues to rotate in the second direction until it abuts against the second side of the limit block 130, the bidirectional rotating table 200 pushes the slider 121 to drive the limit block 130 and the limit trigger baffle 140 to slide in the direction of the second limit switch 142 until the second limit switch 142 is triggered by the limit trigger baffle 140 and outputs a signal. At this time, it means that the bidirectional rotating table 200 has reached the rotation limit position (second rotation limit position) in this direction, and the bidirectional rotating table 200 can stop rotating or switch the rotation direction.

[0042] Compared with the prior art, the bidirectional rotation limiting mechanism 100 disclosed in the embodiment of the utility model realizes the effective limitation of the rotation angle of the bidirectional rotating table 200, has a simple and reliable structure, is easy to operate, and is not prone to cumulative errors after long-term operation, and can effectively prevent related parts and processed objects on the dicing machine from being damaged.

[0043] In order to realize the automatic reset of the slider 121 when the bidirectional rotating platform 200 switches the rotation direction, the bidirectional rotation limiting mechanism disclosed in the embodiment of the utility model further includes a first tension spring 143 and a second tension spring 144. One end of the first tension spring 143 is connected to the limit trigger baffle 140, and the other end is arranged at the first end of the mounting bracket 110; one end of the second tension spring 144 is connected to the limit trigger baffle 140, and the other end is arranged at the second end of the mounting bracket 110. The first tension spring 143 and the second tension spring 144 can pull the limit trigger baffle 140, the limit stopper 130 and the slider 121 to reset when the rotation direction of the bidirectional rotating platform 200 switches.

[0044] The limit stopper 130 and the limit trigger baffle 140 can be fixed to the slider 121 by bolt connection. Figure 1 The limit stopper 130 is arranged on the first side of the slider 121 to cooperate with the rotation limit part. The limit trigger baffle 140 is arranged on the second side of the slider 121, and both ends extend beyond the slider 121 and correspond to the positions of the first limit switch 141 and the second limit switch 142.

[0045] Combination Figure 1The limit trigger baffle 140 can be an L-shaped plate, one side of which is bolted to the slider 121, and the other side is used to insert into the sensing slots of the first limit switch 141 and the second limit switch 142 for limit sensing.

[0046] Combination Figure 2 A tension spring fixing member 145 is provided on the limit trigger baffle 140 , and the first tension spring 143 and the second tension spring 144 are connected to the limit trigger baffle 140 through the tension spring fixing member 145 .

[0047] Specifically, the first tension spring 143 and the second tension spring 144 can be hingedly connected to the tension spring fixing member 145, and the tension spring fixing member 145 can be one or two. It should be noted that, in addition to the limit trigger baffle 140, the first tension spring 143 and the second tension spring 144 can also be connected to the limit stopper 130 or the slider 121, as long as they can drive the limit trigger baffle 140 to reset.

[0048] Combination Figure 1 In one embodiment, the tension spring fixing member 145 is a bolt, which is screwed into the limit trigger baffle 140, and the first tension spring 143 and the second tension spring 144 are hung on the screw rod. This solution is simple and convenient to install. When there is one tension spring fixing member 145, it is set in the middle position of the limit trigger baffle 140. When there are two tension spring fixing members 145, they are symmetrically set on the limit trigger baffle 140 to ensure that the limit trigger baffle 140 is evenly stressed.

[0049] In a specific embodiment disclosed in the present utility model, there is one tension spring fixing member 145, and a plurality of first hanging holes for hanging the first tension spring 143 are provided on the side facing the first tension spring 143, and a plurality of second hanging holes for hanging the second tension spring 144 are provided on the side facing the second tension spring 144. The first hanging holes and the second hanging holes correspond to each other one by one, and are symmetrically arranged relative to the axis of the tension spring fixing member 145, so that the tension spring fixing member 145 is evenly stressed.

[0050] The tension spring fixing member 145 can be a plate-like structure welded on the limit trigger baffle 140 , with a first hanging hole and a second hanging hole respectively opened on both sides of the plate, and the first hanging hole and the second hanging hole are arranged along an extension direction perpendicular to the limit trigger baffle 140 .

[0051] Combination Figure 2 The first tension spring 143 and the second tension spring 144 are obliquely stretched between the tension spring fixing piece 145 and the mounting bracket 110. Since the first tension spring 143 and the second tension spring 144 are consumable parts, their elastic force will weaken and they will be stretched after being used for a period of time. At this time, by adjusting the hanging hole position of the first tension spring 143 and the second tension spring 144, the preload force of the first tension spring 143 and the second tension spring 144 can be adjusted to extend the service life of the first tension spring 143 and the second tension spring 144.

[0052] In a specific embodiment disclosed in the present utility model, a first bracket is provided on the mounting bracket 110, and a first tension spring 143 is connected between the first bracket and the tension spring fixing member 145, so that the first tension spring 143 is arranged along the extension direction of the mounting bracket 110; a second bracket is provided on the mounting bracket 110, and a second tension spring 144 is connected between the second bracket and the tension spring fixing member 145, so that the second tension spring 144 is arranged along the extension direction of the mounting bracket 110.

[0053] Compared with the first tension spring 143 and the second tension spring 144 obliquely pulling the limit trigger baffle 140, the first bracket and the second bracket can fix the two ends of the first tension spring 143 and the second tension spring 144 at the same position height, so that the limit trigger baffle 140 is only subjected to the tension along its sliding direction, and the force is more uniform.

[0054] like Figure 1 As shown, the mounting bracket 110 is provided with an avoidance groove for avoiding the movement of the limit stopper 130 .

[0055] Furthermore, first elastic buffer pads are provided at both ends of the limit block 130 along the sliding direction of the slider 121, or second elastic buffer pads are provided on the two side walls of the avoidance groove along the sliding direction of the slider 121. If the first limit switch 141 or the second limit switch 142 fails, the first elastic buffer pad and the second buffer pad can buffer the collision between the limit block 130 and the avoidance groove.

[0056] Wherein, the first elastic buffer pad and the second buffer pad may be elastic rubber pads.

[0057] The sliding cooperation between the slider 121 and the mounting bracket 100 can be achieved through the sliding guide rail 120. Specifically, the mounting bracket 110 is provided with a sliding guide rail 120, and the sliding guide rail 120 is located between the first limit switch 141 and the second limit switch 142, and the slider 121 is slidably arranged on the sliding guide rail 120.

[0058] In order to further improve the reliability of the operation of the bidirectional rotation limit mechanism 100, limit parts for limiting the sliding of the slider 121 are provided at both ends of the sliding guide rail 120. The limit parts are used as a limit guarantee for the safe position of the sliding of the slider 121. If the first limit switch 141 or the second limit switch 142 fails, the sliding of the slider 121 will exceed the first limit position or the second limit position. At this time, the limit parts can limit the sliding of the slider 121.

[0059] The limiting portion may be a limiting protrusion disposed at the end of the sliding rail 120. The sliding rail 120 and the mounting bracket 110 may be welded and connected, and a weight-reducing hole may be provided on the sliding rail 120.

[0060] In order to facilitate the limiting cooperation with the rotation limiting part of the bidirectional rotating table 200, positioning grooves for the rotation limiting part to be embedded are provided on both sides of the limiting block 130. The rotation limiting part is used to abut against the bottom of the positioning groove and push the limiting block 130 to slide.

[0061] The rotation limiting part may be a screw structure, so as to be conveniently connected with the bidirectional rotating platform 200 and adjust the limiting matching length with the limiting stopper 130 .

[0062] When the position-limiting stopper 130 is provided with a positioning groove, the first elastic buffer pad may be disposed on the side wall of the opening end of the positioning groove.

[0063] The first limit switch 141 and the second limit switch 142 disclosed in the embodiment of the utility model can both be photoelectric sensors / photoelectric switches to sensitively identify and quickly output photoelectric sensing signals, thereby identifying the rotation limit position of the bidirectional rotating table 200.

[0064] like Figure 1 As shown, the first limit switch 141 and the second limit switch 142 are respectively fixedly mounted on both ends of the sliding guide rail 120. As the slider 121 slides, the limit trigger baffle 140 selectively senses and cooperates with one of the first limit switch 141 and the second limit switch 142.

[0065] The dicing machine disclosed in the embodiment of the utility model includes the above-mentioned bidirectional rotation limiting mechanism 100, so it also has the above-mentioned structure and beneficial effects, which will not be repeated here.

[0066] Combination Figure 2 The bidirectional rotation limiting mechanism 100 and the bidirectional rotating platform 200 are both arranged on the rotating mounting base 210, and a rotation limiting portion is arranged on the circumferential side wall of the bidirectional rotating platform 200. The bidirectional rotation limiting mechanism 100 is fixed to the periphery of the bidirectional rotating platform 200 through a connecting piece, and the limiting block 130 is opposite to the circumferential side wall of the bidirectional rotating platform 200 so as to be moved by the rotation limiting portion.

[0067] The terms "first" and "second" in the specification and claims of the utility model are used to distinguish different objects, rather than to describe a specific order, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not set to the listed steps or units, but may include steps or units that are not listed. In addition, in the description of the embodiments of the present application, "multiple" refers to two or more than two.

[0068] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A bidirectional rotation limiting mechanism, used for limiting the rotation of a bidirectional rotating platform (200), wherein a rotation limiting portion is provided on the bidirectional rotating platform (200), characterized in that: include: a mounting bracket (110), wherein a first limit switch (141) and a second limit switch (142) are arranged on the mounting bracket (110), wherein the first limit switch (141) and the second limit switch (142) are used to respectively identify two rotation limit positions of the bidirectional rotating platform (200); A slider (121) is slidably arranged on the mounting bracket (110), and a limit trigger baffle (140) and a limit block (130) for being moved by the rotation limit portion are arranged on the slider (121); when the slider (121) slides to a first limit position, the limit trigger baffle (140) triggers the first limit switch (141); when the slider (121) slides to a second limit position, the limit trigger baffle (140) triggers the second limit switch (142).

2. The bidirectional rotation limiting mechanism according to claim 1, characterized in that: Also includes: A first tension spring (143), one end of which is connected to the limit trigger baffle (140), and the other end of which is arranged on the first end of the mounting bracket (110); A second tension spring (144) has one end connected to the limit trigger baffle (140) and the other end arranged at the second end of the mounting bracket (110); the first tension spring (143) and the second tension spring (144) are used to pull the limit trigger baffle (140) to reset when the rotation direction of the bidirectional rotating table (200) is switched.

3. The bidirectional rotation limiting mechanism according to claim 2, characterized in that: A tension spring fixing member (145) is provided on the limit trigger baffle (140), and the first tension spring (143) and the second tension spring (144) are connected to the limit trigger baffle (140) via the tension spring fixing member (145).

4. The bidirectional rotation limiting mechanism according to claim 3, characterized in that: The tension spring fixing member (145) is provided with a plurality of first hanging holes for hanging the first tension spring (143) on one side thereof, and a plurality of second hanging holes for hanging the second tension spring (144) on one side thereof; The first hanging hole and the second hanging hole correspond to each other one by one and are symmetrically arranged relative to the axis of the tension spring fixing member (145).

5. The bidirectional rotation limiting mechanism according to claim 3, characterized in that: The mounting bracket (110) is provided with a first bracket, the first tension spring (143) is connected between the first bracket and the tension spring fixing member (145), and the first tension spring (143) is arranged along the extension direction of the mounting bracket (110); and / or, A second bracket is provided on the mounting bracket (110), the second tension spring (144) is connected between the second bracket and the tension spring fixing member (145), and the second tension spring (144) is arranged along the extension direction of the mounting bracket (110).

6. The bidirectional rotation limiting mechanism according to claim 1, characterized in that: The mounting bracket (110) is provided with a sliding guide rail (120), the sliding guide rail (120) is located between the first limit switch (141) and the second limit switch (142), and the slider (121) is slidably arranged on the sliding guide rail (120); Limiting parts for limiting the sliding of the sliding block (121) are provided at both ends of the sliding guide rail (120).

7. The bidirectional rotation limiting mechanism according to claim 6, characterized in that: The mounting bracket (110) is provided with an avoidance groove for avoiding the movement of the limit stopper (130).

8. The bidirectional rotation limiting mechanism according to claim 7, characterized in that: Along the sliding direction of the slider (121), first elastic buffer pads are provided at both ends of the limit stopper (130); and / or, Along the sliding direction of the sliding block (121), second elastic buffer pads are arranged on both side walls of the avoidance groove.

9. The bidirectional rotation limiting mechanism according to any one of claims 1 to 8, characterized in that: The first limit switch (141) and the second limit switch (142) are both photoelectric sensors.

10. A dicing machine, characterized in that: It comprises a bidirectional rotation limiting mechanism as described in any one of claims 1 to 9.

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