Pavement coring machine for geographic surveying and mapping of highway construction

Abstract

The invention relates to the field of column core sampling equipment, in particular to a road surface coring machine for geographic surveying and mapping of highway construction, which comprises a torque protection mechanism arranged at the tail end of an output shaft of the coring machine and a coring bit arranged at the tail end of the torque protection mechanism, the torque protection mechanism comprises a sleeve with a vertically upward opening, the section of a groove of the sleeve in any radius direction is in an inverted-T shape, a bolt is connected to the top end of the sleeve in a screwed mode, and a spring is connected between the head of the bolt and the top end of the sleeve in a sleeved mode. According to the coring machine, the coring bit can be lifted up in a self-adaptive mode when cutting of the coring bit is blocked, so that the downward pressure of the coring bit is relieved, the cutting force and the feeding speed are reduced, danger caused by sharp increase of reverse torsion of the coring bit is avoided, and the key torque protection mechanism is easy to manufacture, easy to assemble and use and low in cost. And the device can be compatibly installed and used in other drilling equipment with different types and universal interfaces, and has high popularization and use values.

Description

Technical Field

[0001] The present invention relates to the field of core sampling equipment, and particularly to a pavement coring machine for highway construction geographical surveying and mapping. Background Art

[0002] During highway construction, it is necessary to sample and test the construction environment to determine the formation structure composition. The sample is obtained by drilling a core with a cylindrical drill bit. Due to the complexity and uncertainty of the underground environment, especially when the drill bit edge encounters harder gravel in relatively soft soil layers, the cutting resistance of the drill bit increases sharply, which is likely to cause serious wear of the drill bit or even chipping of the edge. More dangerously, after the drill bit is suddenly blocked, the powerful reverse torque will be transmitted to the equipment through the drill bit, which is likely to cause vibration and damage to the equipment. If it is a simple manually supported coring device, it is also likely to cause the equipment to get out of control and pose a danger to the operator. Therefore, the present invention proposes a pavement coring machine for highway construction geographical surveying and mapping that has a torque protection function during the process of drilling the core. Summary of the Invention

[0003] In view of the problems in the above-mentioned or existing highway engineering geographical surveying and mapping, that is, the reverse torque caused by the blockage and jamming of the drill bit during core drilling is likely to damage the equipment and pose an operation safety risk, the present invention is proposed.

[0004] Therefore, the object of the present invention is to provide a pavement coring machine for highway construction geographical surveying and mapping.

[0005] To solve the above technical problems, the present invention provides the following technical solution: A pavement coring machine for highway construction geographical surveying and mapping, including a torque protection mechanism arranged at the end of the output shaft of the coring machine, and a coring drill bit arranged at the end of the torque protection mechanism; the torque protection mechanism includes a sleeve with an opening vertically upward, and the cross-section of the groove of the sleeve along any radius direction is in a "convex" shape. A bolt is screwed at the top of the sleeve, a spring is sleeved between the head of the bolt and the top of the sleeve, a short pin is fixedly inserted along the radial direction at the bottom end of the bolt, and a top screw is screwed along the axial direction at the bottom end of the bolt, and the top of the top screw abuts and presses the short pin.

[0006] As a preferred scheme of the pavement coring machine for highway construction geographical surveying and mapping of the present invention, wherein: the outer wall of the bottom end of the sleeve is provided with threads for fastening with the coring drill bit, and a threaded hole is opened along the radial direction at the top end of the bolt for fastening with the output shaft of the coring machine.

[0007] As a preferred scheme of the pavement coring machine for highway construction geographical surveying and mapping of the present invention, wherein: annular grooves are coaxially opened on the top surface of the sleeve and the bottom surface of the bolt head, and the two ends of the spring are respectively pressed in the two annular grooves.

[0008] As a preferred embodiment of the core drill for pavement in highway construction geographical surveying and mapping of the present invention, wherein: four main balls are arranged in the spiral groove of the bolt, and the pitch between two adjacent main balls is one-fourth of the spiral groove pitch of the bolt. Four circular chutes are formed in the inner wall of the small-diameter part of the chute of the sleeve, and the positions of the four chutes respectively correspond to the four main balls. The chutes are filled with sub-balls, and the sub-balls are in rolling contact with the main balls.

[0009] As a preferred embodiment of the core drill for pavement in highway construction geographical surveying and mapping of the present invention, wherein: the chute is recessed inward at the position of the main ball, and three sub-balls are in rolling contact with the main ball at the recessed part of the chute.

[0010] As a preferred embodiment of the core drill for pavement in highway construction geographical surveying and mapping of the present invention, wherein: a snap spring is clamped at the notch of each chute. The two open ends of the snap spring are concave spherical surfaces and are sleeved with the main ball, and the two side edges of the chute at the position of the main ball are provided with concave spherical surfaces and are sleeved with the main ball.

[0011] As a preferred embodiment of the core drill for pavement in highway construction geographical surveying and mapping of the present invention, wherein: three short pins are distributed in an annular array with respect to the bolt, and the mutually remote ends of the short pins are arc surfaces and are in sliding contact with the inner wall of the large-diameter section of the chute of the sleeve.

[0012] As a preferred embodiment of the core drill for pavement in highway construction geographical surveying and mapping of the present invention, wherein: a section plane is provided at an angle of 120 degrees at the mutually adjacent ends of the short pins, and the mutually adjacent ends of the short pins are closely attached through the section plane.

[0013] As a preferred embodiment of the core drill for pavement in highway construction geographical surveying and mapping of the present invention, wherein: a keyway is formed at the contact position between the peripheral wall of the short pin and the setscrew, and the top end of the setscrew is a circular ring protrusion and is matched and clamped with the keyway.

[0014] As a preferred embodiment of the core drill for pavement in highway construction geographical surveying and mapping of the present invention, wherein: a jack is formed in the side wall of the sleeve at the position of the short pin, and the contour of the jack is an L-shaped circle, and the long side of the L-shaped circle of the jack is vertically arranged.

[0015] Advantages of the core sampler for highway construction geographical mapping of the present invention: The core sampler of the present invention can adaptively lift the core drill bit when the cutting of the core drill bit is blocked, so as to reduce the downward pressure of the core drill bit, as well as reduce the cutting force and feed speed, and avoid the danger caused by the sudden increase of the reverse torque of the core drill bit. Among them, the key torque protection mechanism is easy to manufacture, simple to assemble and use, and can also be compatibly installed and used in other different types of drilling equipment with common interfaces, and has high popularization and application value. Brief Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic structural diagram of a core sampler for highway construction geographical mapping.

[0018] Figure 2 It is Figure 1 an enlarged structural view of the torque protection mechanism in

[0019] Figure 3 a sectional view of the structure of the torque protection mechanism.

[0020] Figure 4 It is a sectional view of the structure where the sleeve and the ball are located at the chute.

[0021] Figure 5 It is a sectional view of the structure of the bolt.

[0022] Figure 6 It is a schematic structural diagram of the snap ring.

[0023] Figure 7 It is a sectional view of the structure of the sleeve.

[0024] Figure 8 It is Figure 7 an enlarged structural view of the place A in

[0025] Figure 9 a sectional view of the assembly structure decomposition of the short pin and the bolt.

[0026] In the figure: 100, torque protection mechanism; 101, sleeve; 102, bolt; 103, spring; 104, short pin; 105, setscrew; 106, annular groove; 107, main ball; 108, sub-ball; 109, snap ring; 101a, chute; 101b, jack; 104a, cut surface; 104b, keyway; 200, core drill bit. Detailed Embodiments

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] Example, see Figures 1 to 9 This embodiment provides a road coring machine for geographic surveying and mapping of highway construction. When the coring drill bit is blocked in cutting, the coring drill bit is adaptively lifted up to reduce the downward pressure of the coring drill bit and reduce the cutting force and feed speed, thereby avoiding the danger caused by the surge of the reverse torque of the coring drill bit. Figure 1 As shown, it includes a torque protection mechanism 100 disposed at the end of the output shaft of the coring machine, and a coring drill bit disposed at the end of the torque protection mechanism 100; Figure 2 and Figure 3 As shown, the torque protection mechanism 100 includes a sleeve 101 with an opening pointing vertically upward, and the cross-section of the groove of the sleeve 101 along any radial direction is in a "convex" shape, a bolt 102 is screwed on the top of the sleeve 101, a spring 103 is sleeved between the head of the bolt 102 and the top of the sleeve 101, a short pin 104 is fixedly inserted in the radial direction of the bottom end of the bolt 102, and a top screw 105 is threadedly fastened to the bottom end of the bolt 102 along the axial direction, and the top end of the top screw 105 presses against the short pin 104.

[0029] Specifically, Figure 2 and Figure 3 As shown, the outer wall of the bottom end of the sleeve 101 is provided with a thread to be fastened with the coring drill bit, and the top end of the bolt 102 is provided with a threaded hole along its radial direction to be fastened with the output shaft of the coring machine, as shown in FIG. Figure 7 and Figure 9 As shown, an annular groove 106 is coaxially formed on the top surface of the sleeve 101 and the bottom surface of the head of the bolt 102, and both ends of the spring 103 are respectively pressed into the two annular grooves.

[0030] like Figure 5 As shown, four main balls 107 are arranged in the spiral groove of the bolt 102, and the difference between two adjacent main balls 107 is one quarter of the spiral groove pitch of the bolt 102. Figure 7 As shown, the inner wall of the sleeve 101 is provided with four annular sliding grooves 101a at the small diameter portion thereof. Figure 3 As shown, the positions of the four slide grooves 101a correspond to four main balls 107 respectively, and the slide grooves 101a are filled with auxiliary balls 108, and the auxiliary balls 108 and the main balls 107 are in rolling contact, as shown in FIG. Figure 4 As shown, the slide groove 101a is located at the main ball 107 and is concave inward, and there are three auxiliary balls 108 in the concave part of the slide groove 101a that are in rolling contact with the main ball 107. Figure 5As shown, a circlip 109 is clamped at the notch of each chute 101a. As Figure 6 and Figure 8 shown, the open ends of the circlip 109 are concave spherical surfaces and are sleeved with the main ball 107, and spherical concave surfaces are provided at both side edges of the chute 101a at the main ball 107 and are sleeved with the main ball 107.

[0031] As Figure 9 shown, there are three short pins 104 distributed in an annular array about the bolt 102, and the mutually remote ends of the short pins 104 are arc surfaces that are in sliding contact with the inner wall of the large-diameter section of the groove of the sleeve 101. At the mutually close ends of the short pins 104, cut surfaces 104a are provided at an angle of 120 degrees, and the mutually close ends of the short pins 104 are closely attached through the cut surfaces 104a. Key grooves 104b are formed at the contact positions between the peripheral walls of the short pins 104 and the setscrews 105, and the tops of the setscrews 105 are circular ring protrusions and are snap-fitted with the key grooves 104b. As Figure 2 and Figure 7 shown, jack holes 101b are formed in the side wall of the sleeve 101 at the positions of the short pins 104, and the contours of the jack holes 101b are oval-shaped, and the long sides of the oval shapes of the jack holes 101b are vertically arranged.

[0032] The present invention provides a pavement coring machine for highway construction geographical surveying, and mainly provides a torque protection mechanism 100. This mechanism is serially assembled between the coring bit and the equipment output shaft and is used for adaptively adjusting the downward pressure of the coring bit during cutting and protecting the coring bit against sudden increase in reverse torque.

[0033] Referring to Figure 2 , in the case of no external force intervention, the coring bit and the sleeve 101 rotate together with the bolt 102. When the coring bit is cutting, the direction of the cutting resistance it receives is opposite to its rotation direction. Taking the bolt 102 as a reference system, this cutting resistance has a tendency to make the sleeve 101 rotate upward along the spiral groove of the bolt 102, thereby reducing the downward drilling pressure of the coring bit, and further causing the cutting pressure and the cutting resistance to decrease. After adding the spring 103 to the torque protection mechanism 100, a thrust is generated on the sleeve 101 downward relative to the bolt 102 by the spring 103 to prevent the coring bit and the casing from climbing upward relative to the bolt 102 during cutting. When this tendency is effectively suppressed, the coring bit can continue the drilling operation.

[0034] According to the action mode of the above torque protection mechanism 100, obviously, as long as a spring 103 that matches the cutting force of the core drill bit used is selected, the torque protection mechanism 100 can play its role. Under the supporting action of this spring 103, the bolt 102 can transmit sufficient torque to the sleeve 101 and the core drill bit through the downward pressure of the spring 103 to meet the normal working torque requirements of the core drill bit. When abnormal situations such as blockage occur during the drilling process of the core drill bit and the cutting resistance surges, taking the core drill bit as a reference system, the torsional force of the continuously rotating bolt 102 will break through the elastic force of the spring 103, causing the bolt 102 to compress the spring 103 and rotate relatively into the sleeve 101. In actual working conditions, it is manifested that once the core drill bit is blocked beyond the supporting force of the spring 103, it will rotate relatively slower than the bolt 102 together with the sleeve 101, compress the spring 103, and lift upward, avoiding the continuous deterioration of the working conditions of the core drill bit and achieving the purpose of torque protection;

[0035] According to the above torque protection action process, the spring 103 is in a severely compressed state, and the thrust on the sleeve 101 is close to the maximum. That is to say, when the torque protection is triggered, the cutting downward pressure of the core drill bit is higher than that in the normal drilling operation state. The core drill bit can obtain a higher torque to break through obstacles in the torque protection state, and there will be no situation where the core drill bit slips and fails to continue operating;

[0036] After knowing that the torque transmitted by the torque protection mechanism 100 to the core drill bit is strongly related to the elastic force (compression degree) of the spring 103, the downward feeding speed of the core drill should be controlled to avoid the spring 103 being completely compressed. When the spring 103 is completely compressed, the sleeve 101 completely loses the upward movement space, and the torque protection function will fail. At this time, the torque of the core drill will be completely transmitted to the core drill bit. 200

[0037] Regarding the screw connection between the bolt 102 and the sleeve 101:

[0038] The input end (bolt 102) and the output end (sleeve 101) of the torque protection mechanism 100 must be in a spiral assembly and cannot adopt a simple straight groove insertion method. This is because the reaction force of the core drill bit during rotary cutting is opposite to the movement direction of the core drill bit, including the rotary cutting movement and the axial feeding movement of the core drill bit. Among them, the rotary cutting force of the core drill bit accounts for a relatively large proportion, and it is almost perpendicular to the axis direction of the core drill bit. Therefore, the force received when the core drill bit is blocked during drilling is extremely difficult to be released through the axis direction of the core drill bit, and the torque protection mechanism 100 must be guided through a spiral structure to play its role;

[0039] Reference Figure 3, four main balls 107 are evenly distributed in the spiral groove of the bolt 102 within a pitch length range. Relying on the circulating rolling of a circle of secondary balls 108 distributed in the inner wall chute 101a of the sleeve 101, the rolling of the main balls 107 relative to the spiral groove of the bolt 102 is realized, so as to reduce the movement resistance between the bolt 102 and the sleeve 101, and reduce the interference of the reduced movement resistance between the bolt 102 and the sleeve 101 to the torque protection mechanism 100, thereby improving the reliability of the equipment; reference Figure 4 , the chute 101a is designed with an inward concavity at the position of the main ball 107, so that more secondary balls 108 are in contact with the main ball 107. First, it increases the number of force application points between the main ball 107 and the secondary ball 108. Second, it ensures that the secondary ball 108 rolls more smoothly when passing over the main ball 107. Third, it plays a role in limiting the position of the main ball 107;

[0040] The design of this ball structure mainly considers easy processing and manufacturing and anti-pollution performance. Different from the ball nut used in the conventional lead screw, the ball structure design of the torque protection mechanism 100 does not adopt the overall circulation of the lead screw ball nut, but conducts independent circulation through four chutes 101a. When one of the chutes 101a is blocked, it will not affect the use of the balls in other chutes 101a, and it is suitable for the outdoor drilling operation environment with relatively large dust pollution.

[0041] In summary, the core drill of the present invention can adaptively lift the core drill when the core drill bit is blocked during cutting, so as to reduce the downward pressure of the core drill bit, reduce the cutting force and the feed speed, and avoid the danger caused by the sudden increase in the reverse torque of the core drill bit. The key torque protection mechanism is easy to manufacture, simple to assemble and use, and can also be compatibly installed and used in other different types of drilling equipment with a common interface, and has a high promotion and use value.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A road surface coring machine for geographic surveying and mapping of highway construction, characterized in that: It comprises a torque protection mechanism (100) arranged at the end of a core drilling machine output shaft, and a core drilling drill bit (200) arranged at the end of the torque protection mechanism (100); The torque protection mechanism (100) comprises a sleeve (101) with an opening facing vertically upward, and the cross-section of the groove of the sleeve (101) along any radial direction thereof is in a "convex" shape, a bolt (102) is screwed onto the top end of the sleeve (101), a spring (103) is sleeved between the head of the bolt (102) and the top end of the sleeve (101), a short pin (104) is fixedly inserted into the bottom end of the bolt (102) along its radial direction, and a top screw (105) is threadedly fastened to the bottom end of the bolt (102) along its axial direction, and the top end of the top screw (105) abuts against and presses the short pin (104).

2. The road surface coring machine for highway construction geographic surveying and mapping as claimed in claim 1, characterized in that: The outer wall of the bottom end of the sleeve (101) is provided with a thread for fastening with the coring drill bit (200), and the top end of the bolt (102) is provided with a threaded hole along its radial direction for fastening with the output shaft of the coring machine.

3. The road surface coring machine for highway construction geographic surveying and mapping as claimed in claim 1, characterized in that: An annular groove (106) is coaxially formed on the top surface of the sleeve (101) and the bottom surface of the head of the bolt (102), and the two ends of the spring (103) are respectively pressed into the two annular grooves (106).

4. The road surface coring machine for highway construction geographic surveying and mapping as claimed in claim 1, characterized in that: Four main balls (107) are arranged in the spiral groove of the bolt (102), and the difference between two adjacent main balls (107) is one quarter of the spiral groove pitch of the bolt (102). The groove of the sleeve (101) is located on the inner wall of its small diameter part and has four annular slide grooves (101a). The positions of the four slide grooves (101a) correspond to the four main balls (107) respectively, and the slide grooves (101a) are filled with auxiliary balls (108). The auxiliary balls (108) and the main balls (107) are in rolling contact.

5. The road surface coring machine for highway construction geographic surveying and mapping as claimed in claim 4, characterized in that: The slide groove (101a) is located at the main ball (107) and is in a concave shape inwardly, and three auxiliary balls (108) are located at the concave part of the slide groove (101a) and are in rolling contact with the main ball (107).

6. The road surface coring machine for highway construction and geographic surveying as claimed in claim 5, characterized in that: The notch of each slide groove (101a) is clamped with a retaining spring (109), the two ends of the opening of the retaining spring (109) are spherically concave and sleeved with the main ball (107), and the two side edges of the slide groove (101a) are located at the main ball (107) and are provided with spherical concave and sleeved with the main ball (107).

7. The road surface coring machine for highway construction and geographic surveying as claimed in claim 1, characterized in that: There are three short pins (104) distributed in a circular array about the bolt (102), and the ends of the short pins (104) that are away from each other are in the form of arc surfaces that fit and slide in contact with the inner wall of the large diameter section of the groove of the sleeve (101).

8. The road surface coring machine for highway construction and geographic surveying as claimed in claim 7, characterized in that: The ends of the short pins (104) that are close to each other are each provided with a cut surface (104a) at an angle of 120 degrees, and the ends of the short pins (104) that are close to each other are tightly fitted through the cut surface (104a).

9. The road surface coring machine for highway construction and geographic surveying as claimed in claim 8, characterized in that: A keyway (104b) is provided at the contact point between the peripheral wall of the short pin (104) and the top screw (105), and the top end of the top screw (105) is a circular protrusion and is matched and clamped with the keyway (104b).

10. The road surface coring machine for highway construction and geographic surveying as claimed in claim 9, characterized in that: A plug hole (101b) is provided on the side wall of the sleeve (101) at the short pin (104), and the outline of the plug hole (101b) is in the shape of a circle, and the long side of the circle of the plug hole (101b) is arranged vertically.

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