Blast hole measuring device before rock blasting

Abstract

The utility model belongs to the technical field of rock blasting, and particularly relates to a blasthole measuring device before rock blasting, which comprises a barrel and a measuring rod, a mounting disc is arranged at the upper end of the barrel, a winding drum is rotatably arranged on the mounting disc, the measuring rod is slidably arranged on the inner wall of the barrel, a rope is wound on the winding drum, and the measuring rod is connected with the barrel. The rope is connected with the upper end of the measuring rod; an elastic ferrule is arranged on the outer wall of the rope in a tightly attached mode and connected to the interior of the upper end of the barrel through a connecting piece. By means of the winding drum and the rope, stretching and retracting of the measuring rod and the cylinder body are achieved by winding the rope, precise stretching and retracting guiding can be achieved, and depth measurement is conducted on the blast hole. And meanwhile, the depth of the blast hole can be accurately measured, and the problem that due to the fact that the rope is located in the cylinder, a loose point position cannot be observed, the rope is excessively lowered, and then measurement errors occur is solved.

Description

Technical Field

[0001] This utility model belongs to the field of rock blasting technology, and in particular relates to a device for measuring blasting holes before rock blasting. Background Technology

[0002] Blasting is currently the most widely used and effective rock-breaking method in railway construction, water conservancy projects, mining projects, and other earthwork projects. During the blasting process, it is necessary to drill holes in the rock strata to load explosives into them. Since blasting operations often require a large number of holes, and the depth, diameter, and cross-sectional diameter of the drilled holes all affect the blasting effect, it is necessary to measure the blasting holes before blasting frozen rocks.

[0003] In measuring the depth of blast holes in rock, existing equipment primarily utilizes multi-segment extendable casings. However, for relatively deep blast holes, the casing extension and retraction are typically achieved using a winch mechanism—a drum and rope—to pull the casing and thus measure the hole depth. However, with this method, the feedback after the casing reaches the bottom of the blast hole is insufficient, easily leading to operators releasing excess rope. This results in inaccurate depth measurements, and the manual rope release method introduces a degree of measurement error. Utility Model Content

[0004] In view of the technical problems existing in the background art, the present invention provides a device for measuring blasting holes before rock blasting.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A rock blasting pre-blasting hole measuring device includes a cylinder and a measuring rod. The upper end of the cylinder is provided with a mounting plate, and a drum is rotatably mounted on the mounting plate. The measuring rod is slidably mounted on the inner wall of the cylinder. A rope is wound on the drum and connected to the upper end of the measuring rod. An elastic collar is tightly attached to the outer wall of the rope and connected to the upper end of the cylinder through a connector.

[0007] Optionally, the connector is a mounting screw, which has a through-hole for threading and a plurality of insertion holes inside the through-hole. The upper end of the cylinder has a first threaded hole, the mounting screw is threaded into the first threaded hole, and the elastic collar is inserted into one of the insertion holes.

[0008] Optionally, the mounting plate has a stepped hole inside, and a rotating sleeve is rotatably disposed in the stepped hole. A fixing screw is threaded onto the rotating sleeve. A sliding head is disposed at the upper end of the measuring rod, and a lifting lug is disposed at the upper end of the sliding head. The fixing screw can pass through the lifting lug to fix the measuring rod.

[0009] Optionally, an observation port is provided through the upper end of the cylinder, and the fixing screw is disposed inside the observation port and can be rotated at the observation port position.

[0010] Optionally, the first threaded hole is perpendicular to the observation port, and the first threaded hole is located on the bottom side of the rotating sleeve.

[0011] Optionally, the mounting plate has a plurality of second threaded holes evenly distributed around its circumference, and a support screw is provided in each of the second threaded holes.

[0012] Optionally, a handle is provided at the upper end of the installation disk.

[0013] Optionally, the cylinder body has a first sliding hole and a second sliding hole sequentially formed from top to bottom. The inner diameter of the first sliding hole is larger than the inner diameter of the second sliding hole. The measuring rod is slidably disposed in the second sliding hole, and the sliding head is slidably disposed in the first sliding hole.

[0014] Optionally, the mounting plate is provided with mounting blocks, the two ends of the drum are rotatably disposed in the inner holes of the mounting blocks, and a handle is provided on one side of the drum.

[0015] Optionally, the bottom end of the support screw is provided with a supporting spherical surface, and both the mounting screw and the fixing screw are located on the upper side of the supporting spherical surface.

[0016] This utility model has the following advantages and beneficial effects:

[0017] This invention provides a device for measuring blast holes before rock blasting, including a cylinder and a measuring rod. The measuring rod is slidably mounted on the inner wall of the cylinder. Using a drum and rope, the measuring rod and cylinder are extended and retracted by winding the rope, allowing for precise extension and retraction guidance to measure the depth of the blast hole. Simultaneously, an elastic collar is used to stably clamp the rope, ensuring that the section of rope between the measuring rod and the elastic collar remains taut. This allows the slack state of the rope to be observed immediately at the top of the cylinder when the bottom of the measuring rod touches the bottom of the blast hole, enabling accurate depth measurement. This avoids the problem of the rope being excessively lowered due to its location inside the cylinder, preventing the observation of the slack point and thus avoiding measurement errors. Attached Figure Description

[0018] Figure 1This is a structural diagram of the rock blasting pre-blasting hole measuring device of this utility model;

[0019] Figure 2 This is a cross-sectional view of the rock blasting pre-blasting hole measuring device of this utility model;

[0020] Figure 3 for Figure 2 A schematic diagram of the depth measurement being performed by lowering the measuring rod.

[0021] Figure 4 for Figure 2 A magnified view of a portion of point a.

[0022] Figure 5 for Figure 3 A magnified view of a section at point b in the middle;

[0023] Figure 6 for Figure 5 Enlarged view of a portion of the central structure;

[0024] Figure 7 This is one of the structural diagrams of the middle cylinder and mounting plate of this utility model;

[0025] Figure 8 This is the second structural diagram of the middle cylinder and mounting plate of this utility model;

[0026] Figure 9 This is a cross-sectional view of the middle cylinder and the mounting plate of this utility model;

[0027] Figure 10 This is a structural diagram of the measuring rod in this utility model;

[0028] Figure 11 This is a structural diagram of the mounting screw in this utility model;

[0029] Figure 12 This is a cross-sectional view of the mounting screw in this utility model.

[0030] Reference numerals: 1-Cylinder, 11-First sliding hole, 12-Second sliding hole, 13-Observation port, 14-First threaded hole, 2-Mounting plate, 21-Second threaded hole, 22-Stepped hole, 23-Mounting block, 24-Handle, 25-Rotating sleeve, 3-Measuring rod, 31-Sliding head, 32-Lifting lug, 4-Mounting screw, 41-Wire groove, 42-Plug hole, 5-Support screw, 51-Locking nut, 52-Support spherical surface, 6-Drum, 61-Handle, 62-Rope, 63-Elastic collar, 7-Fixing screw. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0033] Example

[0034] like Figures 1-12 As shown, a rock blasting pre-blasting hole measuring device includes a cylinder 1 and a measuring rod 3. A mounting plate 2 is provided at the upper end of the cylinder 1, and a drum 6 is rotatably mounted on the mounting plate 2. The measuring rod 3 is slidably mounted on the inner wall of the cylinder 1. A rope 62 is wound around the drum 6 and connected to the upper end of the measuring rod 3. Through the sliding extension and retraction of the cylinder 1 and the measuring rod 3, the rope 62 is used to extend and retract the measuring rod 3, thereby measuring the depth of the blasting hole. An elastic collar 63 is tightly fitted to the outer wall of the rope 62 and is connected to the inner upper end of the cylinder 1 via a connector.

[0035] This invention provides a device for measuring the depth of a blasting hole before rock blasting. Utilizing a drum 6 and a rope 62, the measuring rod 3 and the drum 1 are extended and retracted by winding the rope 62, allowing for precise extension and retraction guidance and depth measurement of the blasting hole. Simultaneously, an elastic collar 63 stably clamps the rope 62, ensuring that the section of rope 62 between the measuring rod 3 and the elastic collar 63 remains taut. This allows for immediate observation of the slack state of the upper rope 62 at the top of the drum 1 when the bottom of the measuring rod 3 touches the bottom of the blasting hole, enabling accurate depth measurement. This avoids the problem of the rope 62 being excessively lowered due to its location inside the drum 1, preventing timely observation of the slack point and thus avoiding measurement errors.

[0036] like Figures 1-12As shown, the connecting component is a mounting screw 4, which has a through-hole 41. The through-hole 41 has several insertion holes 42. A first threaded hole 14 is provided at the upper end of the cylinder 1. The mounting screw 4 is threaded into the first threaded hole 14, and the elastic collar 63 is inserted into one of the insertion holes 42. This design allows for the detachable connection of the elastic collar 63. The multiple insertion holes 42 ensure compatibility with ropes 62 of different diameters, facilitating adjustment of the mounting screw 4 and ensuring the rope 62 is on the central axis of the cylinder 1. This structure facilitates the installation and fixation of the elastic collar 63. When the measuring rod 3 reaches the bottom of the blast hole, the measuring rod 3 stops moving, but the rope 62 continues to descend. Therefore, the rope 62 on the elastic collar 63 is in a slack state and can be observed immediately. Simultaneously, by simply observing the upper surface of the blast hole and aligning it with the position of the rope 62, the depth of the blast hole can be measured. For ease of measurement, the measuring rod 3 needs to have a specific length dimension, and the rope 62 has a length mark. As the rope 62 is lowered, the reading can be directly taken from the rope 62 to obtain the hole depth.

[0037] like Figures 1-12 As shown, the mounting plate 2 further includes a stepped hole 22 inside, within which a rotating sleeve 25 is rotatably mounted. A fixing screw 7 is threaded onto the rotating sleeve 25. A sliding head 31 is located at the upper end of the measuring rod 3, and a lifting lug 32 is located at the upper end of the sliding head 31. The fixing screw 7 passes through the lifting lug 32 to fix the measuring rod 3. When measurement is not required, the measuring rod 3 can be lifted and stored inside the cylinder 1, and the fixing screw 7 can be inserted into the lifting lug 32 to complete the fixation of the measuring rod 3.

[0038] Furthermore, an observation port 13 is provided through the upper end of the cylinder 1, and a fixing screw 7 is located inside the observation port 13. The fixing screw 7 can be rotated at the observation port 13 position. This design is because when the measuring rod 3 is lifted, it may rotate, meaning the opening position of the lifting lug 32 is uncertain. Therefore, a rotating sleeve 25 is designed. By rotating the fixing screw 7 inside the observation port 13, the rotating sleeve 25 can be rotated, aligning the fixing screw 7 with the opening of the lifting lug 32. The fixing screw 7 is then screwed in until it passes through the lifting lug 32, thus fixing the measuring rod 3.

[0039] like Figure 4 and 5 As shown, the first threaded hole 14 is perpendicular to the observation port 13. The first threaded hole 14 is located on the bottom side of the rotating sleeve 25, and the fixing screw 7 and the mounting screw 4 do not interfere with each other.

[0040] Furthermore, the mounting plate 2 has several second threaded holes 21 evenly distributed around its circumference. A support screw 5 is installed in the second threaded hole 21, and a locking nut 51 is installed on the support screw 5. The height of the support screw 5 can be adjusted by using the support screw 5 so that it is supported on the outside of the blast hole. This structure allows the cylinder 1 to be placed on uneven ground.

[0041] Furthermore, a handle 24 is provided at the top of the installation plate 2 for easy transportation.

[0042] Furthermore, the cylinder 1 has a first sliding hole 11 and a second sliding hole 12 sequentially opened from top to bottom. The inner diameter of the first sliding hole 11 is larger than the inner diameter of the second sliding hole 12. The measuring rod 3 is slidably disposed in the second sliding hole 12, and the sliding head 31 is slidably disposed in the first sliding hole 11, so as to realize the precise guiding sliding of the measuring rod 3.

[0043] Furthermore, the mounting plate 2 is provided with a mounting block 23, and the two ends of the drum 6 are rotatably set in the inner hole of the mounting block 23. A handle 61 is provided on one side of the drum 6. By rotating the handle 61, the drum 6 can be rotated to realize the extension and retraction of the measuring rod 3.

[0044] Furthermore, the bottom end of the support screw 5 is provided with a supporting spherical surface 52, which facilitates support on uneven ground. The mounting screw 4 and the fixing screw 7 are both located on the upper side of the supporting spherical surface 52. This design provides the support screw 5 with a certain height, allowing the mounting plate 2 to suspend in the air. The mounting screw 4 and the fixing screw 7 are both located on the upper side of the supporting spherical surface 52, ensuring that they do not contact the ground and guaranteeing the normal operation of the entire device.

[0045] Measurement principle:

[0046] like Figure 4 As shown, at this time, the fixing screw 7 extends and passes through the lifting lug 32 to fix the position of the measuring rod 3, so that the measuring rod 3 is stored inside the cylinder 1. At this time, the elastic collar 63 is set on the rope 62, and the mounting screw 4 is pulled out to the outside to avoid interference with the sliding head 31 and the lifting lug 32.

[0047] like Figure 5 As shown, the fixing screw 7 is retracted and disconnected from the lifting lug 32. Then, a short distance of rope 62 is lowered, and the mounting screw 4 is screwed in. The elastic collar 63 on the rope 62 is installed in the insertion hole 42, and the rope 62 can be lowered further. The measuring rod 3 is continuously lowered into the blast hole until it touches the bottom. After touching the bottom, when the rope 62 is lowered further, the rope 62 above the elastic collar 63 will slacken, allowing for timely observation and obtaining a precise hole depth. The depth of the blast hole can be obtained by directly observing the position of the rope 62 corresponding to the upper end face of the blast hole from the observation port 13.

[0048] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for measuring blasting holes before rock blasting, characterized in that: The device includes a cylinder and a measuring rod. The upper end of the cylinder is provided with a mounting plate, and a drum is rotatably mounted on the mounting plate. The measuring rod is slidably mounted on the inner wall of the cylinder. A rope is wound on the drum and connected to the upper end of the measuring rod. An elastic collar is tightly attached to the outer wall of the rope and is connected to the inside of the upper end of the cylinder through a connector.

2. The rock blasting pre-blasting hole measuring device according to claim 1, characterized in that: The connector is a mounting screw, which has a through-hole for threading. The through-hole has several insertion holes. The upper end of the cylinder has a first threaded hole. The mounting screw is threaded into the first threaded hole, and the elastic collar is inserted into one of the insertion holes.

3. The rock blasting pre-blasting hole measuring device according to claim 2, characterized in that: The mounting plate has a stepped hole inside, and a rotating sleeve is rotatably installed in the stepped hole. A fixing screw is threaded onto the rotating sleeve. A sliding head is provided at the upper end of the measuring rod, and a lifting lug is provided at the upper end of the sliding head. The fixing screw can pass through the lifting lug to fix the measuring rod.

4. The rock blasting pre-blasting hole measuring device according to claim 3, characterized in that: An observation port is provided through the upper end of the cylinder, and the fixing screw is located inside the observation port and can be rotated at the observation port position.

5. The rock blasting pre-blasting hole measuring device according to claim 4, characterized in that: The first threaded hole is perpendicular to the observation port, and the first threaded hole is located on the bottom side of the rotating sleeve.

6. The rock blasting pre-blasting hole measuring device according to claim 4, characterized in that: The mounting plate has several second threaded holes evenly distributed around its circumference, and a support screw is installed in each of the second threaded holes.

7. The rock blasting pre-blasting hole measuring device according to claim 1, characterized in that: The installation disk is provided with a handle at the top.

8. The rock blasting pre-blasting hole measuring device according to claim 4, characterized in that: The cylinder has a first sliding hole and a second sliding hole arranged sequentially from top to bottom. The inner diameter of the first sliding hole is larger than the inner diameter of the second sliding hole. The measuring rod is slidably disposed in the second sliding hole, and the sliding head is slidably disposed in the first sliding hole.

9. The rock blasting pre-blasting hole measuring device according to claim 4, characterized in that: The mounting plate is provided with mounting blocks, and the two ends of the drum are rotatably disposed in the inner holes of the mounting blocks. A handle is provided on one side of the drum.

10. The rock blasting pre-blasting hole measuring device according to claim 6, characterized in that: The bottom end of the support screw is provided with a supporting spherical surface, and the mounting screw and the fixing screw are both located on the upper side of the supporting spherical surface.

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