A counter gravity hole grinding device

Abstract

The present invention relates to the technical field of hole grinding, and specifically provides a counter-gravity hole grinding device, comprising: a grinding assembly, a ball joint, a push rod, a base, a fixed pulley assembly, a tension sensor and a counterweight assembly, wherein the grinding assembly is contacted and connected with the push rod through a ball joint, the lower part of the push rod abuts against a traction rope in the fixed pulley assembly through a movable pulley, one end of the traction rope is fixed, and the other end is connected to the tension sensor and the counterweight assembly in sequence; during the grinding process of the reflector, there is no need to flip the reflector, so that the back of the reflector faces downward and the mirror surface faces upward, and the entire device is arranged below the reflector, and the push rod is made to move linearly by adjusting the counterweight assembly, thereby changing the top force of the grinding assembly on the grinding surface. The present invention avoids the flipping of the reflector, and avoids the grinding device pressing on the reflector to affect the surface shape of the reflector, and the grinding device has the advantages of safety, reliability, and simple operation.

Description

Technical Field

[0001] The invention relates to the technical field of hole grinding, and in particular provides a counter-gravity hole grinding device. Background Art

[0002] When the reflector is supported by the back, the holes of the reflector body need to be ground and adapted when the mirror body and the inlay are adjusted. For the grinding of the holes of the back-supported reflector, the reflector is currently turned over so that the back of the mirror faces up and the mirror face faces down, and then the holes are ground. However, this method has the following disadvantages:

[0003] First, the reflector needs to be flipped. It is difficult to flip a large-aperture reflector, and the risk factor is high. The reversal process can easily damage the reflector.

[0004] Second, to avoid scratching the mirror surface by placing it directly on the grinding table, a small plane needs to be reserved on the edge of the mirror surface or the mirror body for support during grinding. However, the overall mass of the reflector is large, and the stress on the supporting surface is large during support, which will affect the surface shape of the reflector.

[0005] Third, for large-aperture reflectors, the back hole has a large diameter and the grinding tool is heavy. After flipping the reflector, the grinding tool is placed directly on the reflector. During grinding, the weight stress is concentrated on the mirror surface, which is more harmful to the mirror surface.

[0006] Based on the above problems, it is urgent to design a reflector back hole grinding device that does not require flipping the reflector and can avoid concentrated stress. Summary of the invention

[0007] In order to solve the above-mentioned problem, the present invention provides a counter-gravity hole grinding device. When grinding the hole on the back of the reflector, there is no need to flip the reflector. The whole device is arranged below the reflector. The grinding tool is pressed against the back of the reflector. The counterweight assembly is adjusted to make the push rod rise, thereby providing the grinding tool with a push force on the back of the reflector. The grinding handle is used to achieve manual grinding, which reduces the risk factor in the hole grinding process and avoids the influence of the gravity of the grinding device on the surface shape of the reflector.

[0008] The present invention provides a counter-gravity hole grinding device, comprising: a grinding assembly, a mandrel, a base, a fixed pulley assembly, a tension sensor and a counterweight assembly;

[0009] The grinding assembly includes a grinding tool and a grinding handle arranged on the side of the grinding tool and capable of driving the grinding tool to rotate; the upper end of the push rod is rotatably connected to the grinding tool, and the lower end of the push rod is connected to a movable pulley;

[0010] The fixed pulley assembly includes at least two fixed pulleys fixed on the base and a traction rope, one end of the traction rope is fixed on the base, the other end of the traction rope is connected to the tension sensor, and the lower end of the tension sensor is connected to a counterweight assembly; the counterweight assembly includes a counterweight block, a tension spring and a tension adjustment screw, the tension spring is connected between the counterweight block and the tension adjustment screw, and the tension adjustment screw is connected to the base through a thread;

[0011] The movable pulley is arranged on the traction rope between the two fixed pulleys, and the lifting and lowering of the top rod is realized through the transmission of the traction rope.

[0012] Preferably, the upper end of the push rod is connected with a ball joint, and is rotatably connected to the grinding tool through the ball joint.

[0013] Preferably, it also includes a linear bearing, which is sleeved on the push rod and fixedly mounted on the base.

[0014] Preferably, the grinding tool is in the shape of a frustum, and during grinding, the grinding tool is placed below the grinding surface.

[0015] Preferably, a universal wheel is installed on the lower surface of the base, and the counter-gravity hole grinding device is moved by the universal wheel.

[0016] Preferably, it also includes: a fixed support assembly, which is connected to the base and locks the position of the counter-gravity hole grinding device through the fixed support assembly.

[0017] Preferably, three universal wheels are evenly distributed on the lower surface of the base.

[0018] Preferably, three fixed support components are evenly distributed on the lower surface of the base.

[0019] Preferably, the extension length of the fixed support assembly below the base is adjustable, and by adjusting the extension length of the fixed support assembly, the fixed support assembly replaces the universal wheel to support the base, thereby achieving position locking of the counter-gravity hole grinding device.

[0020] Preferably, the grinding assembly and the counterweight block are replaceable, and the pushing force of different grinding assemblies on the ground surface can be adapted by replacing counterweight blocks of different masses. During grinding, the pushing force is adjusted by adjusting the screw-in amount of the tension adjustment screw.

[0021] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0022] The present invention designs a device for a new grinding method. The grinding device is arranged below the ground surface, and the lifting and lowering of the grinding assembly is realized by pulley transmission. The top force applied to the ground surface can be accurately controlled by the coordinated use of the counterweight assembly and the tension sensor, thereby improving the grinding quality and efficiency. In the process of grinding the reflector, there is no need to flip the reflector, and the mirror can be ground with the back facing down and the mirror surface facing up, thereby avoiding the difficulty and safety risks of flipping a large-diameter reflector and saving installation time. The back of the reflector is directly ground from below, thereby avoiding the need to support the mirror surface or the edge of the mirror body, and the grinding device will not be placed on the reflector, thereby avoiding the weight of the grinding device squeezing the reflector, causing the reflector to generate a large concentrated stress, and then the surface shape changes.

[0023] The present invention also designs a fixed support assembly and a universal wheel. The universal wheel can facilitate the movement of the grinding device; the fixed support assembly can lock the position of the grinding device during grinding, avoiding displacement of the device during grinding, improving the flexibility of the grinding device while ensuring stability during the grinding process.

[0024] The present invention has made an innovative design to the pulley system structure. By combining the fixed pulley and the movable pulley, the push rod can generate a power that is twice that provided by the counterweight assembly. By replacing the counterweight block, the push force required by different grinding tools can be adapted. During grinding, the push force can be fine-tuned by adjusting the tension adjustment screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of a counter-gravity hole grinding device provided according to an embodiment of the present invention;

[0026] Figure 2 is a detailed annotated diagram of a reverse gravity hole grinding device provided according to an embodiment of the present invention;

[0027] Figure 3 is a force transmission diagram of a counter-gravity hole grinding device provided according to an embodiment of the present invention.

[0028] Reference numerals include:

[0029] Grinding assembly 1, ball joint 2, push rod assembly 3, base 4, linear bearing 5, fixed pulley assembly 6, fixed support assembly 7, tension sensor 8, counterweight assembly 9, universal wheel 10;

[0030] Grinding tool 11, grinding handle 12;

[0031] Guide rod 31, movable pulley 32;

[0032] Fixed block 61, first fixed pulley 62, traction rope 63, second fixed pulley 64, third fixed pulley 65;

[0033] Counterweight block 91 , tension spring 92 , tension adjustment screw 93 . DETAILED DESCRIPTION

[0034] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the same modules are represented by the same reference numerals. In the case of the same reference numerals, their names and functions are also the same. Therefore, the detailed description thereof will not be repeated.

[0035] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not constitute a limitation of the present invention.

[0036] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a counter-gravity hole grinding device, which mainly includes: a grinding assembly 1, a ball joint 2, a push rod assembly 3, a base 4, a fixed pulley assembly 6, a fixed support assembly 7, a tension sensor 8, a counterweight assembly 9 and a universal wheel 10, wherein the grinding assembly 1 is used to grind the hole position of the ground surface, and is composed of a grinding tool 11 and a grinding handle 12. The grinding tool 11 is truncated, and its diameter increases from top to bottom. Two grinding handles 12 with an angle of 180° are connected to the side surface of the lower end of the grinding tool 11. During the grinding process, the grinding tool 11 is pressed against the lower surface of the ground surface, and the manual grinding of the hole position is achieved by manually rotating the grinding handle 12. In addition, the grinding tool 11 can be replaced and adjusted according to the size of the hole to be ground.

[0037] The push rod assembly 3 includes a guide rod 31 and a movable pulley 32. A linear bearing 5 is sleeved on the guide rod 31. The outer side of the linear bearing 5 is fixed on the base 4. The base 4 is the installation base of the entire device and provides an installation interface for the remaining components. The linear bearing 5 constrains the movement direction of the guide rod 31 so that it can move up and down. The upper end of the guide rod 31 is connected to a ball joint 2. The grinding tool assembly 1 is in contact with the guide rod 31 through the ball joint 2, which ensures that the guide rod 31 rises and transmits the push force to the grinding tool 11 through the ball joint 2, so that the grinding tool 11 is completely fitted with the hole to be ground and is not restricted by the position of the guide rod 31. It can also ensure that the grinding tool 11 can be driven for grinding through the grinding handle 12. The lower end of the guide rod 31 is connected to the shaft of the movable pulley 32.

[0038] The fixed pulley assembly 6 includes a fixed block 61, a first fixed pulley 62, a traction rope 63, a second fixed pulley 64 and a third fixed pulley 65, wherein the fixed block 61, the first fixed pulley 62, the second fixed pulley 64 and the third fixed pulley 65 are fixed on the base 4 at the same height, one end of the traction rope 63 is fixed to the base 4 through the fixed block 61, the middle section of the traction rope 63 is placed on the first fixed pulley 62, the second fixed pulley 64 and the third fixed pulley 65, and the movable pulley 32 is placed on the traction rope 63 between the first fixed pulley 62 and the second fixed pulley 64, and the lifting and lowering of the push rod assembly 3 and the grinding assembly 1 are realized by pulley transmission. Through the combination of the first fixed pulley 62, the second fixed pulley 64 and the movable pulley 32, the push rod assembly 3 is subjected to a force twice the gravity of the counterweight assembly 9. The third fixed pulley 65 is mainly used to pull the distance between the traction ropes 63 on both sides of the second fixed pulley 64 apart to prevent the traction ropes 63 from being entangled, or the connecting parts on the traction ropes 63 from being entangled with the traction ropes 63. The other end of the traction rope 63 is extended from the third fixed pulley 65 and is connected to the tension sensor 8 and the counterweight assembly 9 in sequence, wherein the tension sensor 8 is mainly used to measure the tension on the traction rope 63, so as to facilitate the subsequent determination of the top force of the grinding assembly 1 on the grinding surface. In the embodiment of the present invention, the traction rope 63 is made of steel wire rope to prevent the elastic deformation of the traction rope 63 itself from affecting the position adjustment of the push rod assembly 3.

[0039] The counterweight assembly 9 includes, from top to bottom, a counterweight block 91, a tension spring 92, and a tension adjustment screw 93, wherein the counterweight block 91 can be replaced and adjusted. Different grinding assemblies 1 can be adapted by replacing counterweight blocks 91 of different masses. The specific mass of the counterweight block 91 can be adjusted according to demand. A counterweight block 91 of larger mass can be selected during grinding. The counterweight block 91 can not only provide tension to overcome the gravity of the grinding assembly 1, the ball joint 2, and the push rod assembly 3, but also make the tension excessive, further providing the grinding assembly 1 with a pushing force on the ground surface; or the counterweight block 91 can only provide tension to overcome the gravity of the grinding assembly 1, the ball joint 2, and the push rod assembly 3, without providing additional pushing force. The lower end of the counterweight block 91 is connected to the tension adjustment screw 93 through a tension spring 92. The tension adjustment screw 93 is threadedly connected to the protruding plate of the base 4. The head of the tension adjustment screw 93 faces downward and the threaded rod part faces upward. During grinding, by screwing the tension adjustment screw 93 downward, the push rod assembly 3 and the grinding assembly 1 can be driven to move upward. Since the top of the grinding assembly 1 is limited by the grinding surface, the tension spring 92 will be further stretched, thereby achieving fine-tuning of the top force. Similarly, by screwing the tension adjustment screw 93 upward, the grinding assembly 1 can be separated from the grinding surface.

[0040] In addition, in order to facilitate the transportation and positioning of the device, the reverse gravity hole grinding device of the embodiment of the present invention is also provided with universal wheels 10 and fixed support components 7, wherein three sets of universal wheels 10 are evenly installed at the bottom of the base 4, and the grinding device can be freely pushed by the universal wheels 10, so as to facilitate the alignment of the grinding component 1 with the grinding hole position. During grinding, it is necessary to ensure the stability of the grinding device to avoid the displacement of the grinding device due to the universal wheels 10, which causes the grinding hole position to be misaligned. Therefore, the embodiment of the present invention also has three sets of fixed support components 7 evenly installed at the bottom of the base 4, and the extension length of the fixed support component 7 below the base 4 is adjustable. By adjusting the extension length of the fixed support component 7, the fixed support component 7 replaces the universal wheels 10 to support the base 4, so as to achieve the position locking of the reverse gravity hole grinding device. The reverse gravity hole grinding device of the embodiment of the present invention can not only realize flexible movement through the universal wheels 10 during the movement, but also maintain the stability of the entire device through the fixed support component 7 during the grinding process.

[0041] Based on the above structure, Figure 3 As shown, the embodiment of the present invention further specifically describes the process of grinding the hole position on the back side of the reflector using the reverse gravity hole grinding device as follows:

[0042] First, there is no need to flip the reflector before grinding, and the traditional method of placing the grinding device above the reflector is avoided. The counter-gravity hole grinding device is directly moved to the bottom of the reflector through the universal wheel 10, so that the center of the grinding tool 11 is aligned with the center of the hole to be ground. After alignment, the position of the counter-gravity hole grinding device is locked by the fixed support assembly 7. Select a suitable counterweight block 91, and the counterweight assembly 9 provides power F1=m1g+F t , where m1 is the mass of the counterweight 91, g is the acceleration due to gravity, and F t is the tensile stress of the tension spring 92. Due to the action of the movable pulley 32, the top force F2=2F1 generated in the push rod assembly 3, and the contact force between the grinding tool 11 and the hole to be ground is F3=F2-(m2-m3-m4)g, where m2 is the mass of the push rod assembly 3, m3 is the mass of the ball joint 2, and m4 is the mass of the grinding tool assembly 1. By adjusting the mass m1 of the counterweight block 91 and the tensile stress F of the tension spring 92 t To adjust the contact force between the grinding tool 11 and the hole to be ground, the grinding tool 11 is driven to rotate in the hole to be ground by rotating the grinding handle 12 to complete the grinding process.

[0043] The reverse gravity hole grinding device of the present invention does not need to flip the reflector when grinding the hole position on the back of the reflector, which enhances the efficiency and safety of the large-diameter reflector installation and adjustment. The grinding device is arranged below the reflector, and the gravity of the grinding device is applied to the ground, which avoids the generation of large concentrated stress at the support position of the reflector due to the gravity of the grinding device, thereby affecting the surface shape of the reflector. In addition, using the reverse gravity hole grinding device of the present invention to grind the reflector from bottom to top is also a new grinding scheme. The reverse gravity hole grinding device of the present invention has been applied to the grinding and adjustment of large-diameter reflectors of several models of space remote sensing cameras. It has been verified by tests that it is in good condition and all indicators can meet the use requirements.

[0044] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

[0045] The above specific implementations of the present invention do not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A counter gravity hole grinding device, characterized in that: Used for grinding the hole position on the back of the reflector, the counter-gravity hole grinding device is arranged below the reflector, and is supported on the back of the reflector by a grinding tool, and the counter-gravity hole grinding device includes: a grinding assembly, a push rod, a base, a fixed pulley assembly, a tension sensor and a counterweight assembly; The grinding assembly includes a grinding tool and a grinding handle provided on the side of the grinding tool and capable of driving the grinding tool to rotate; the upper end of the push rod is rotatably connected to the grinding tool, and the lower end of the push rod is connected to a movable pulley; the upper end of the push rod is connected to a ball joint, and is rotatably connected to the grinding tool through the ball joint; The fixed pulley assembly includes at least two fixed pulleys fixed on the base and a traction rope, one end of the traction rope is fixed on the base, the other end of the traction rope is connected to the tension sensor, and the lower end of the tension sensor is connected to a counterweight assembly; the counterweight assembly includes a counterweight block, a tension spring and a tension adjustment screw, the tension spring is connected between the counterweight block and the tension adjustment screw, and the tension adjustment screw is connected to the base through a thread; The movable pulley is arranged on a traction rope between two fixed pulleys, and the lifting and lowering of the mandrel is realized through the transmission of the traction rope; The grinding assembly and the counterweight block are replaceable. The counterweight blocks of different masses can be replaced to adapt to different pushing forces of the grinding assembly on the ground surface. During grinding, the pushing force can be adjusted by adjusting the screwing amount of the tension adjustment screw.

2. The counter-gravity hole grinding device according to claim 1, characterized in that: It also includes a linear bearing, which is sleeved on the push rod and fixedly installed on the base.

3. The counter-gravity hole grinding device according to claim 1, characterized in that: The grinding tool is in the shape of a truncated cone and is placed under the grinding surface during grinding.

4. The counter-gravity hole grinding device according to claim 1, characterized in that: A universal wheel is installed on the lower surface of the base, and the counter-gravity hole grinding device is moved by the universal wheel.

5. The counter-gravity hole grinding device according to claim 1, characterized in that: Also includes: A fixed support assembly is connected to the base, and the position of the counter-gravity hole grinding device is locked by the fixed support assembly.

6. The counter-gravity hole grinding device according to claim 4, characterized in that: The lower surface of the base is evenly distributed with three universal wheels.

7. The counter-gravity hole grinding device according to claim 6, characterized in that: The lower surface of the base is evenly distributed with three fixed support components.

8. The counter-gravity hole grinding device according to claim 6, characterized in that: The extended length of the fixed support assembly below the base is adjustable. By adjusting the extended length of the fixed support assembly, the fixed support assembly replaces the universal wheel to support the base, thereby achieving position locking of the counter-gravity hole grinding device.

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