阅读说明：本技术 一种电缆表皮自动粗化处理设备及方法 (Automatic roughening treatment equipment and method for cable skin ) 是由 陈卫华 郭西洋 杨茂祥 汪洋 储轶芳 于 2021-06-21 设计创作，主要内容包括：本发明涉及电缆表皮的粗化领域,具体公开了一种电缆表皮自动粗化处理设备及方法,包括工作台、打磨机构、上打磨定位机构、下打磨定位机构；所述打磨机构固定在工作台上,可完成电缆规定长度向上部分的打磨处理；所述上打磨定位机构及下打磨定位机构安装在工作台上,可相互配合完成电缆压紧、电缆实时张紧及电缆旋转等功能,配合打磨机构可完成电缆整周的打磨工作。上述结构的电缆表皮自动粗化处理设备,实现了不同粗细、不同材料的电缆表皮自动粗化处理工作,且可控打磨长度与打磨厚度,包含：施加预拉力、保持电缆张紧、旋转电缆、打磨电缆等功能,降低了人工劳动强度,提高了生产效率以保证该工序可以满足日益增长的产量需求。(The invention relates to the field of roughening of cable skins, and particularly discloses automatic roughening treatment equipment and method for cable skins, wherein the automatic roughening treatment equipment comprises a workbench, a polishing mechanism, an upper polishing positioning mechanism and a lower polishing positioning mechanism; the polishing mechanism is fixed on the workbench and can polish the upward part of the specified length of the cable; the upper polishing positioning mechanism and the lower polishing positioning mechanism are arranged on the workbench and can be matched with each other to complete the functions of cable compression, cable real-time tensioning, cable rotation and the like, and the polishing work of the whole circumference of the cable can be completed by matching with the polishing mechanism. The automatic alligatoring treatment facility of cable epidermis of above-mentioned structure has realized the automatic alligatoring treatment work of cable epidermis of different thicknesses, different materials, and controllable length of polishing and the thickness of polishing contain: the functions of exerting pretension, keeping the cable tensioned, rotating the cable, polishing the cable and the like are achieved, the labor intensity of workers is reduced, and the production efficiency is improved to ensure that the process can meet the increasing output requirement.)

1. The utility model provides an automatic alligatoring treatment facility of cable epidermis which characterized in that: comprises a workbench (100), a polishing mechanism (200), an upper polishing positioning mechanism (300) and a lower polishing positioning mechanism (400); the polishing mechanism (200) is fixed on the workbench (100) and is used for polishing the upward part of the specified length of the cable (10); the upper polishing positioning mechanism (300) and the lower polishing positioning mechanism (400) are arranged on the workbench (100) and are used for mutually matching to complete the functions of cable (10) compression, cable (10) real-time tensioning and cable (10) rotation and matching with the polishing mechanism (200) to complete the polishing work of the whole circumference of the cable (10).

2. The automatic roughening treatment device for the cable skin according to claim 1, wherein: the polishing mechanism (200) comprises a polishing main shaft (220), a polishing head (210), an up-and-down movement mechanism (230) and a transverse movement mechanism (240);

the polishing main shaft (220) is fixed on the up-and-down movement mechanism (230) through a fixing seat (250) to provide rotary power for the polishing head (210), and the polishing head (210) is fixed on a rotary shaft of the polishing main shaft (220) and used for polishing the surface of the cable (10);

the up-and-down movement mechanism (230) is fixed on the transverse movement mechanism (240) through a connecting block (26) and is used for driving the polishing main shaft (220) and the polishing head (210) to move up and down; when the polishing head (210) works, the up-and-down movement mechanism (230) moves downwards to enable the polishing head (210) to be in contact with the cable (10) to finish polishing work, and when the polishing head stops working, the up-and-down movement mechanism (230) moves upwards to enable the polishing head (210) to be separated from the cable (10), so that the feeding and discharging are convenient and preparation is made for polishing the cable (10) next time;

the transverse movement mechanism (240) comprises a driving mechanism A and a guiding mechanism A, wherein the driving mechanism A comprises a gear A (241), a rack A (242) fixed on the workbench (100) and a driving device A used for driving the gear A (241) to rotate and fixed on the workbench (100); the guide mechanism A comprises a slide rail A (244) fixed on the workbench (100) and a slide block A (246) fixed on the transverse moving plate (245), and a sliding groove matched with the slide rail A (244) is formed in the slide block A (246).

3. The automatic roughening treatment device for the cable skin according to claim 1, wherein: the upper polishing positioning mechanism (300) comprises a longitudinal movement mechanism (310), a vertical pressing mechanism (320), an upper horizontal tension control mechanism, a vertical floating mechanism (330) and an upper cable pressing block (340);

the longitudinal movement mechanism (310) is used for providing rolling power for the rotating cable (10), and comprises a driving mechanism B and a guiding mechanism B, wherein the driving mechanism B comprises a gear B (311), a rack B (312) fixed on a base frame (315) of the longitudinal movement mechanism, and a driving device B (313) used for driving the gear B (311) to rotate and fixed on a longitudinal movement plate (314); the guide mechanism B comprises a slide rail B (316) fixed on a base frame (315) of the longitudinal moving mechanism and a slide block B (317) fixed on the longitudinal moving plate (314), and a sliding groove matched with the slide rail B (316) is formed in the slide block B (317);

the vertical pressing mechanism (320) is used for providing pressing force for pressing the cable (10), and the vertical moving mechanism (310) and the horizontal floating mechanism (350) are connected through the vertical pressing mechanism;

the upper horizontal tension control mechanism is used for ensuring that the cable (10) keeps a tension state in a certain range in real time and ensuring that the cable (10) is in the tension state during initial grinding so as to avoid the cable (10) from loosening and sagging after the cable (10) has small-amplitude relative movement relative to the upper cable pressing block (340), and comprises a horizontal floating mechanism (350) and a pretensioning force applying mechanism (360);

the horizontal floating mechanism (350) comprises a guide mechanism C and a spring A (351) installed on the guide mechanism, the guide mechanism C comprises a guide shaft fixing seat (352) fixed on the vertical pressing mechanism, a guide shaft C (353) fixed on the guide shaft fixing seat and a guide hole C (354) arranged on the vertical floating mechanism fixing seat (355), the guide mechanisms C (354) are symmetrically arranged relative to the vertical pressing mechanism (320), and the spring A (351) penetrates through the guide shaft C (353) and is respectively positioned on one side close to the central plane of the vertical pressing mechanism (320);

the pretension force applying mechanism (360) is arranged on the guide shaft fixing seat (352), and when the pretension force applying mechanism acts, the thrust force is applied to the vertical floating mechanism fixing seat (331), so that the vertical floating mechanism (330) is pushed to move inwards along the guide shaft C (353), and the spring A (351) is in a compressed state;

the vertical floating mechanism (330) ensures that two ends of the cable (10) can be compressed and prevents the cable (10) from being damaged by overlarge pressure, and comprises a guide mechanism D and a spring B (333) arranged on the guide mechanism D, wherein the guide mechanism D comprises a guide shaft D (332) fixed on the upper cable compressing block (340) and a guide hole D arranged on the vertical floating mechanism fixing seat, and the spring B (333) penetrates through the guide shaft D (332) and is positioned between the upper cable compressing block (340) and the vertical floating mechanism fixing seat (331);

the upper cable pressing block (340) adopts an inclined plane and is rounded.

4. The automatic roughening treatment device for the cable skin according to claim 1, wherein: the lower polishing positioning mechanism (400) comprises a lower horizontal tension control mechanism, a lower cable pressing block (410), a pressing block baffle (420) and a dust removal mechanism (430);

the structure of the lower horizontal tension control mechanism is the same as that of the upper horizontal tension control mechanism;

the pressing block baffle (420) is fixedly arranged on the lower cable pressing block (410), so that relative transverse relative sliding is avoided when the upper cable pressing block (340) and the lower cable pressing block (410) are pressed;

and the dust removal mechanism (430) is arranged below the lower horizontal tension control mechanism and is used for absorbing dust generated by polishing.

5. A method using the automatic roughening treatment apparatus for cable skin according to claims 1 to 4, wherein: the method comprises the following steps:

(1) when the electric cabinet (110) is pressed down to start the button, the equipment returns to the original point, the pretension applying mechanism (360) operates, and the small cylinder operates, so that the vertical floating mechanism (330) is pushed to move inwards along the guide shaft C (353), and the spring A (351) is in a compressed state;

(2) tensioning the polishing cable (10), and placing the polishing cable on the lower cable pressing block (410);

(3) pressing a starting button, starting a polishing main shaft (220), operating a cylinder with a guide rod of a vertical pressing mechanism (320), and moving an upper cable pressing block (340) downwards to press a cable; the cylinder with the guide rod of the up-and-down movement mechanism (230) operates to enable the polishing head (210) to be in contact with the cable (10); the small cylinder of the pretension force applying mechanism (360) is reset, and the spring B (333) pushes the vertical floating mechanism (330) to move outwards integrally to tighten the cable;

(4) the transverse movement mechanism (240) operates, and the polishing head (210) finishes polishing the upward surface of the cable (10);

(5) after the transverse movement mechanism (240) runs for a preset polishing length, the longitudinal movement mechanism (310) moves in a stepping mode, the cable (10) rotates for an angle, the transverse movement mechanism (240) continues to run, and the new upward polishing work of the cable (10) is completed;

(6) continuing the actions until the complete peripheral cable (10) is ground;

(7) and after finishing polishing all the cables (10), closing the button of the electric cabinet and stopping polishing.

Technical Field

The invention relates to the field of roughening treatment of cable skins, in particular to automatic roughening treatment equipment and method for cable skins.

Background

The coarsening treatment of the surface of the cable of a certain product is an important process of pretreatment before the cable is poured. At present, the roughening treatment is realized by manually roughening the cables by using sand paper, and the roughening operation can be finished in 2 minutes on average by using one cable, so that the roughening treatment is time-consuming, easily hurts hands and wastes labor during operation, and becomes one of bottlenecks in the production process of the product. Due to the nature of the product, no mature equipment is available for the cable skin roughening treatment.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides the automatic roughening treatment equipment and the automatic roughening treatment method for the cable skin.

The object of the present invention is achieved by the following technical means. An automatic roughening treatment device for a cable skin comprises a workbench, a polishing mechanism, an upper polishing positioning mechanism and a lower polishing positioning mechanism; the polishing mechanism is fixed on the workbench and used for polishing the upward part of the specified length of the cable; the upper polishing positioning mechanism and the lower polishing positioning mechanism are arranged on the workbench and are used for mutually matching to complete the functions of cable compression, cable real-time tensioning and cable rotation, and the polishing mechanism is matched to complete the polishing work of the whole circumference of the cable.

Furthermore, the polishing mechanism comprises a polishing main shaft, a polishing head, an up-and-down movement mechanism and a transverse movement mechanism; the polishing main shaft is fixed on the up-and-down movement mechanism through a fixed seat and provides rotary power for a polishing head, and the polishing head is fixed on a rotary shaft of the polishing main shaft and used for polishing the surface of a cable; the up-and-down movement mechanism is fixed on the transverse movement mechanism through a connecting block and is used for driving the polishing main shaft and the polishing head to move up and down; when the polishing head works, the up-and-down movement mechanism moves downwards to enable the polishing head to be in contact with the cable to finish polishing work, and when the polishing head stops working, the up-and-down movement mechanism moves upwards to enable the polishing head to be separated from the cable, so that the feeding and discharging are convenient and preparation is made for next cable polishing; the transverse movement mechanism comprises a driving mechanism A and a guide mechanism A, wherein the driving mechanism A comprises a gear A, a rack A fixed on the workbench and a driving device A used for driving the gear A to rotate and fixed on the workbench; the guide mechanism A comprises a slide rail A fixed on the workbench and a slide block A fixed on the transverse moving plate, and a slide groove matched with the slide rail A is arranged on the slide block A.

Furthermore, the upper polishing positioning mechanism comprises a longitudinal movement mechanism, a vertical pressing mechanism, an upper horizontal tension control mechanism, a vertical floating mechanism and an upper cable pressing block; the longitudinal movement mechanism is used for providing rolling power for the rotating cable and comprises a driving mechanism B and a guiding mechanism B, wherein the driving mechanism B comprises a gear B, a rack B fixed on a base frame of the longitudinal movement mechanism and a driving device B used for driving the gear B to rotate and fixed on the longitudinal moving plate; the guide mechanism B comprises a slide rail B fixed on the base frame of the longitudinal moving mechanism and a slide block B fixed on the longitudinal moving plate, and the slide block B is provided with a slide groove matched with the slide rail B; the vertical pressing mechanism is used for providing pressing force for pressing the cable and is connected with the longitudinal movement mechanism and the horizontal floating mechanism; the upper horizontal tension control mechanism is used for ensuring that a cable keeps a tension state in real time within a certain range and ensuring that the cable is in the tension state during initial polishing so as to avoid the cable from loosening after the cable relatively moves with a small amplitude relative to the upper cable pressing block, and comprises a horizontal floating mechanism and a pretension force applying mechanism; the horizontal floating mechanism comprises a guide mechanism C and a spring A installed on the guide mechanism, the guide mechanism C comprises a guide shaft fixing seat fixed on the vertical pressing mechanism, a guide shaft C fixed on the guide shaft fixing seat and a guide hole C arranged on the vertical floating mechanism fixing seat, the guide mechanism C is symmetrically arranged relative to the vertical pressing mechanism, and the spring A penetrates through the guide shaft C and is respectively positioned on one side close to the central plane of the vertical pressing mechanism; the pretension force applying mechanism is arranged on the guide shaft fixing seat, and when the pretension force applying mechanism acts, the thrust force of the pretension force applying mechanism is applied on the vertical floating mechanism fixing seat, so that the vertical floating mechanism is pushed to move inwards along the guide shaft C, and the spring A is in a compressed state; the vertical floating mechanism ensures that two ends of a cable can be tightly pressed and prevents the cable from being damaged by overlarge pressure, and comprises a guide mechanism D and a spring B arranged on the guide mechanism, wherein the guide mechanism D comprises a guide shaft D fixed on an upper cable pressing block and a guide hole D arranged on a fixed seat of the vertical floating mechanism; the upper cable pressing block adopts an inclined plane and is rounded.

Furthermore, the lower polishing positioning mechanism comprises a lower horizontal tension control mechanism, a lower cable pressing block, a pressing block baffle and a dust removal mechanism; the structure of the lower horizontal tension control mechanism is the same as that of the upper horizontal tension control mechanism; the pressing block baffle is fixedly arranged on the lower cable pressing block, so that relative transverse relative sliding is avoided when the upper cable pressing block and the lower cable pressing block are pressed tightly; the dust removal mechanism is arranged below the lower horizontal tension control mechanism and used for absorbing dust generated by polishing.

The invention provides an automatic roughening treatment method for a cable skin, which comprises the following steps:

1. when a start button of the electric cabinet is pressed, the equipment returns to the original point, the pretensioning force applying mechanism operates, and the small cylinder operates, so that the vertical floating mechanism is pushed to move inwards along the guide shaft C, and the spring A is in a compressed state;

2. tensioning the polished cable, and placing the polished cable on the lower cable pressing block;

3. pressing a start button, starting a polishing main shaft, operating a cylinder with a guide rod of a vertical pressing mechanism, and moving an upper cable pressing block downwards to press a cable; the cylinder with the guide rod of the up-and-down movement mechanism operates to enable the polishing head to be in contact with the cable; the small cylinder of the pretension applying mechanism resets, and the spring B pushes the vertical floating mechanism to move outwards integrally to tension the cable;

4. the transverse movement mechanism operates, and the polishing head finishes upward polishing work on the cable;

5. after the transverse movement mechanism runs for a preset polishing length, the longitudinal movement mechanism moves in a stepping mode, the cable rotates for an angle, the transverse movement mechanism continues to run, and the new upward surface polishing work of the cable is completed;

6. continuing the actions until the cable is polished completely;

7. and after finishing polishing all cables, closing a button of the electric cabinet and stopping polishing.

The invention has the beneficial effects that: the equipment can adjust the polishing length and control the polishing thickness, can finish the automatic roughening treatment work of the whole circumference of the cable with the diameter between 1mm and 5mm when the surface materials are polyurethane and other materials, and can reduce the labor intensity and improve the production efficiency.

Drawings

FIG. 1 is a view showing an overall configuration of an apparatus;

FIG. 2 is a diagram of a sander mechanism;

FIG. 3 is a top sanding positioning mechanism view;

fig. 4 is a lower sanding positioning mechanism diagram.

Fig. 5 is an overall structure diagram of the cable tension and rotation mechanism.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1 to 4, the automatic cable skin roughening apparatus and method of the present embodiment includes a worktable (100), a polishing mechanism (200), an upper polishing positioning mechanism (300), and a lower polishing positioning mechanism (400); the polishing mechanism (200) is fixed on the workbench (100) and can polish the upward part of the cable (10) with the specified length; go up positioning mechanism (300) of polishing and install on the workstation with lower positioning mechanism (400) of polishing, can cooperate each other to accomplish functions such as cable (10) compress tightly, cable (10) real-time tensioning and cable (10) are rotatory, cooperate polishing mechanism (200) to accomplish the polishing work of cable (10) whole week.

In this embodiment, the polishing mechanism (200) includes a polishing spindle (220), a polishing head (210), an up-and-down movement mechanism (230), and a lateral movement mechanism (240).

In this embodiment, main shaft (220) of polishing chooses for use to be an electronic main shaft, through the converter speed regulation, main shaft (220) of polishing is fixed on up-and-down motion (230) through fixing base (250), for polishing head (210) provide rotary power, polishing head (210) select to be a lengthened diamond dust polishing head, can realize polishing simultaneously with the cable when guaranteeing the durability, polishing head (210) are fixed on the rotation axis of main shaft (220) of polishing, be used for polishing on cable (10) surface.

In the embodiment, the up-and-down movement mechanism (230) is fixed on the transverse movement mechanism (240) through the connecting block (260), the grinding spindle (220) and the grinding head (210) can be driven to move up and down, when the grinding head (210) works, the up-and-down movement mechanism (230) moves downwards, the grinding head (210) is enabled to be in contact with the cable (10) to finish grinding work, when the grinding head stops working, the up-and-down movement mechanism (230) moves upwards, the grinding head (210) is enabled to be separated from the cable (10), feeding and discharging are facilitated, and preparation is made for next grinding of the cable (10).

In this embodiment, the transverse movement mechanism (240) includes a driving mechanism a and a guiding mechanism a, the driving mechanism a includes a gear a (241), a rack a (242) fixed on the worktable (100), and a driving device a (243) for driving the gear a (241) to rotate and fixed on the worktable (100), and the driving device a (243) is selected as a stepping motor; the guide mechanism A comprises a slide rail A (244) fixed on the workbench (100) and a slide block A (246) fixed on the transverse moving plate (245), and a sliding groove matched with the slide rail A (244) is formed in the slide block A (246).

In this embodiment, the upper polishing positioning mechanism (300) includes a longitudinal movement mechanism (310), a vertical pressing mechanism (320), an upper horizontal tension control mechanism, a vertical floating mechanism (330), and an upper cable pressing block (340).

In this embodiment, the longitudinal movement mechanism (310) is used for providing rolling power for the rotating cable (10), and includes a driving mechanism B and a guiding mechanism B, the driving mechanism B includes a gear B (311), a rack B (312) fixed on a base frame (315) of the longitudinal movement mechanism, and a driving device B (313) for driving the gear B (311) to rotate and fixed on a longitudinal movement plate (314), and the driving device B (313) is selected as a stepping motor; the guide mechanism B comprises a slide rail B (316) fixed on a base frame (315) of the longitudinal moving mechanism and a slide block B (317) fixed on the longitudinal moving plate (314), slide grooves matched with the slide rail B (316) are formed in the slide block B (317), and in order to guarantee stability of the mechanism, the guide mechanism B is arranged in two parallel.

In the embodiment, the vertical pressing mechanism (320) is used for providing pressing force for pressing the cable (10), the longitudinal movement mechanism (310) and the horizontal floating mechanism (350) are connected through the vertical pressing mechanism, and the vertical pressing mechanism (320) is designed into a cylinder with a guide rod.

In this embodiment, the upper horizontal tension control mechanism is used for ensuring that the cable (10) is kept in a tensioned state in real time within a certain range, and ensuring that the cable (10) is in a tensioned state during initial polishing, so as to avoid the cable (10) from loosening and sagging after the cable (10) has a small relative sliding motion with respect to the upper cable pressing block (340), and comprises a horizontal floating mechanism (350) and a pretension force applying mechanism (360).

In the embodiment, the horizontal floating mechanism (350) comprises a guide mechanism C and a spring A (351) installed on the guide mechanism, the guide mechanism C comprises a guide shaft fixing seat (352) fixed on the vertical pressing mechanism, a guide shaft C (353) fixed on the guide shaft fixing seat and a guide hole C (354) arranged on the vertical floating mechanism fixing seat (355), the guide mechanisms C are symmetrically arranged relative to the vertical pressing mechanism (320), the number of the guide mechanisms C is totally 4, and the spring A (351) penetrates through the guide shaft C (353) and is respectively located on one side close to the central plane of the vertical pressing mechanism (320).

In the embodiment, the pretension applying mechanism (360) is arranged on the guide shaft fixing seat (352), when the pretension applying mechanism acts, the pushing force is applied on the vertical floating mechanism fixing seat (331), so that the vertical floating mechanism (330) is pushed to move inwards along the guide shaft C (353), the spring A (351) is in a compressed state, and the pretension applying mechanism (360) is selected to be a small air cylinder.

In this embodiment, vertical relocation mechanism (330) guarantee that cable (10) both ends can compress tightly and prevent that pressure from too big damage cable (10), including guiding mechanism D and install spring B (333) on guiding mechanism, guiding mechanism D is including fixing guiding axle D (332) on last cable compact heap and setting up guiding hole D on vertical relocation mechanism fixing base, and guiding hole D installs by wear-resisting bearing, guiding axle D (332) are passed in spring B (333), are located between last cable compact heap (340) and vertical relocation mechanism fixing base (331).

In this embodiment, the upper cable pressing block (340) adopts an inclined plane and is rounded, so as to ensure that the cable can be tensioned to the maximum extent and does not slip.

In this embodiment, the lower polishing positioning mechanism (400) includes a lower horizontal tension control mechanism, a lower cable pressing block (410), a pressing block baffle (420), and a dust removal mechanism (430).

In this embodiment, the structure of the lower horizontal tension control mechanism is the same as that of the upper horizontal tension control mechanism, and is not described again.

In this embodiment, the pressing block baffle (420) is fixedly installed on the lower cable pressing block (410), so that the upper cable pressing block (340) and the lower cable pressing block (410) are not relatively and transversely slid relatively when pressed.

In this embodiment, the dust removing mechanism (430) is installed below the lower horizontal tension control mechanism, and is used for absorbing dust generated by polishing.

To implement the equipment applied to the winding and forming of the spiral line, a workbench (100), a grinding mechanism (200), an upper grinding positioning mechanism (300), a lower grinding positioning mechanism (400) and the like are required to be built; and an equipment control system is established based on the PLC, so that the cooperative work of machinery, electricity and a sensor is realized. The working process is as follows:

1. when the electric control box (110) is pressed to start the button, the equipment returns to the original point, the pretension applying mechanism (360) operates, the small air cylinder in the embodiment operates, so that the vertical floating mechanism (330) is pushed to move inwards along the guide shaft C (353), and the spring A (351) is in a compressed state.

2. The grinding cable (10) is manually tensioned and placed on the lower cable pressing block (410).

3. A start button is pressed, the grinding main shaft (220) is started, a cylinder with a guide rod of the vertical pressing mechanism (320) runs, and the upper cable pressing block (340) moves downwards to press the cable; the cylinder with the guide rod of the up-and-down movement mechanism (230) operates to enable the polishing head (210) to be in contact with the cable (10); the small cylinder of the pretension force applying mechanism (360) is reset, and the spring B pushes the vertical floating mechanism (330) to move outwards integrally, so that the cable is tensioned.

4. The transverse movement mechanism (240) operates, and the polishing head (210) finishes polishing work on the upward surface of the cable (10).

After the transverse movement mechanism (240) runs for the preset polishing length, the longitudinal movement mechanism (310) moves in a stepping mode, the cable (10) rotates for an angle, the transverse movement mechanism (240) continues to run, and the new upward surface polishing work of the cable (10) is completed.

5. The above action is continued until the complete circumferential cable (10) is ground.

6. And after finishing polishing all the cables (10), closing the button of the electric cabinet and stopping polishing.

In conclusion, the above description is only for the preferred embodiment of the present invention and should not be construed as limiting the present invention, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.