A device for detecting the strength of masonry mortar by pendulum knock-in method

Abstract

The application relates to the field of detection equipment, in particular to a device for detecting the strength of masonry mortar by means of a pendulum knock-in method, which comprises a positioning support, a connecting frame, a pendulum, a rotation guide set, a control switch, a translation guide set and a measuring needle, the connecting frame is arranged on the upper portion of the positioning support, the pendulum is rotatably arranged on the connecting frame, and the rotation guide set is connected between the connecting frame and the pendulum. The device is provided with the rotation guide set, the hammer head of the pendulum is guided by the rotation guide set, and after the hammer head is lowered to the lowest point, the movement track of the hammer head is constrained as a horizontal straight line, therefore the vertical components of the movement are offset to each other, only the horizontal force is reserved, when the measuring needle is subjected to the force from the pendulum, the measuring needle does not have the vertical component, therefore the tip of the measuring needle is not easy to be inclined upward during the movement of the measuring needle in the preset range, and the detection data is more accurate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detection equipment, in particular to a device for detecting the strength of masonry mortar by pendulum knock-in method. BACKGROUND

[0002] The pendulum knock-in method is an indirect detection method for detecting the strength of masonry mortar, which determines the depth of the pendulum knocked into the mortar, and combines with the relevant calibration curve to estimate the compressive strength of the mortar.

[0003] The core device of the pendulum knock-in method is a pendulum mortar strength detector, which mainly includes a positioning support, a measuring pin, a pendulum, a pendulum shaft and a release device. The pendulum shaft is rotatably arranged on the positioning support, the tail end of the pendulum is fixedly connected with the pendulum shaft, the release device is arranged on the positioning support and is used for controlling the rotation of the pendulum shaft, the positioning support is provided with a mounting hole, and the measuring pin is arranged in the mounting hole and the tip of the measuring pin faces the surface of the measuring point mortar.

[0004] In use, the staff selects a representative measuring point on the masonry wall according to the detection purpose (such as sampling detection or full detection), then vertically stands the positioning support on the surface of the measuring point mortar, ensures that the tip of the measuring pin is in close contact with the mortar, fixes the support and the wall surface, then lifts the pendulum to a specified angle, locks it, releases it through the release device, so that the pendulum shaft drives the pendulum to freely swing down, at this time the pendulum impacts on the top of the measuring pin with a rated force, the measuring pin is knocked into the mortar, then the staff takes out the measuring pin from the mortar hole, blows the debris and impurities in the mortar hole through the rubber blowing, then measures the total depth of the measuring pin knocked into the mortar by using a depth detector, and finally compares the standard curve matched with the instrument to obtain the mortar strength estimation value of the measuring point.

[0005] However, the existing pendulum mortar strength detector has the following problems in use: after the pendulum freely swings down to the lowest point and collides with the measuring pin, the measuring pin moves into the measuring point mortar under the force, at this time the pendulum moves synchronously with the measuring pin under the action of inertia, and rebounds after the measuring pin stops moving. During the process that the pendulum moves synchronously with the measuring pin, the pendulum tilts and swings up, so that the force applied by the pendulum to the measuring pin has a vertical component, which hinders the measuring pin from entering the measuring point mortar, causes the detection data to deviate, and even causes the measuring hole of the measuring point mortar to crack when the strength of the measuring point mortar is low. SUMMARY

[0006] Therefore, it is necessary to provide a device for detecting the strength of masonry mortar by pendulum knock-in method in view of the problems of the existing pendulum mortar strength detector, so as to solve the problem that the detection data is inaccurate when the existing pendulum mortar strength detector detects the strength of the measuring point mortar.

[0007] The above-mentioned purpose is achieved by the following technical scheme:

[0008] A device for detecting the strength of masonry mortar by pendulum knock-in method comprises:

[0009] A positioning support;

[0010] A connecting frame is arranged at the upper part of the positioning support;

[0011] A pendulum is rotatably arranged on the connecting frame;

[0012] A rotation guide set is connected between the connecting frame and the pendulum, and is used to move the pendulum in a preset range in the horizontal direction after the pendulum freely swings down to the lowest point;

[0013] A control switch is arranged on the connecting frame and is used to control the release of the pendulum;

[0014] A translation guide set is arranged at the lower part of the positioning support;

[0015] A measuring needle is slidably arranged in the translation guide set.

[0016] Preferably, the rotation guide set comprises guide rings and a guide column, the two guide rings are arranged on the connecting frame along a first axis at intervals, opposite surfaces of the two guide rings are provided with guide arc grooves, the guide column is arranged at the handle end of the pendulum, and the two ends of the guide column can slide along the guide arc grooves;

[0017] After the pendulum freely swings down to the lowest point, the guide column continues to slide along the guide arc grooves, so that the distance between the centers of the guide column and the guide rings decreases.

[0018] Preferably, a sliding waist groove is arranged on the side surface of the handle of the pendulum, a load-bearing rod is coaxially and rotatably arranged between the two guide rings, and the load-bearing rod is slidably connected in the sliding waist groove.

[0019] Preferably, the handle of the pendulum is provided with a hammer head at both ends, the guide column has two guide columns, the two guide columns are arranged at the end of the handle of the pendulum, and the two guide columns are selectively slidably connected in the guide arc grooves.

[0020] Preferably, one end surface of the hammer head is circular, and the center of the end surface of the hammer head protrudes outward.

[0021] Preferably, both end surfaces of the hammer head are circular, and the centers of the end surfaces protrude outward.

[0022] Preferably, the hammer head is rotatably arranged on the handle.

[0023] Preferably, the connecting frame can move in the vertical direction relative to the positioning support.

[0024] Preferably, the translation guide kit comprises a fixed sleeve, a moving sleeve, a plurality of clamping jaws and a transmission member, the fixed sleeve is arranged on the positioning support, the moving sleeve is slidingly arranged in the fixed sleeve, the plurality of clamping jaws are arranged in the fixed sleeve at equal intervals in the circumferential direction, and the plurality of clamping jaws can simultaneously move close to or away from the axis of the fixed sleeve, and the transmission member is connected between the plurality of clamping jaws and the moving sleeve.

[0025] The transmission member is configured to make the plurality of clamping jaws move away from the axis of the fixed sleeve synchronously when the moving sleeve moves towards the inside of the fixed sleeve.

[0026] Preferably, the positioning support is provided with a handle on the left and right sides.

[0027] The present application has the following beneficial effects:

[0028] The present application is provided with a rotation guide kit, the hammer head of the pendulum is guided by the rotation guide kit, and after the hammer head is lowered to the lowest point, the movement track of the hammer head is constrained to be a horizontal straight line, so that the vertical components of the movement are offset to each other, and only the horizontal force is reserved, so that the measuring needle does not have a vertical component when the measuring needle is subjected to the force from the pendulum, and the tip of the measuring needle is not easy to tilt upward in the movement of the measuring needle in the preset range, so that the detection data is more accurate. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a whole schematic view of the device for detecting the strength of masonry mortar by the pendulum knock-in method of the present application;

[0030] Figure 2 It is a top view of the device for detecting the strength of masonry mortar by the pendulum knock-in method of the present application;

[0031] Figure 3 It is Figure 2 A-A sectional view;

[0032] Figure 4 It is an exploded view of the device for detecting the strength of masonry mortar by the pendulum knock-in method of the present application;

[0033] Figure 5 It is a structural schematic view of the connecting frame in the device for detecting the strength of masonry mortar by the pendulum knock-in method of the present application;

[0034] Figure 6 It is a structural schematic view of the guide ring in the device for detecting the strength of masonry mortar by the pendulum knock-in method of the present application;

[0035] Figure 7 It is a structural schematic view of the pendulum in the device for detecting the strength of masonry mortar by the pendulum knock-in method of the present application;

[0036] Figure 8Figure 1 is an exploded view of a transmission element in a device for detecting the strength of masonry mortar by a pendulum knock-in method according to the present application;

[0037] Figure 9 Figure 2 is a sectional view of the transmission element in the device for detecting the strength of masonry mortar by the pendulum knock-in method according to the present application;

[0038] Figure 10 Figure 3 is a schematic view of the internal structure of an end connecting ring in the device for detecting the strength of masonry mortar by the pendulum knock-in method according to the present application.

[0039] In the present application,

[0040] 100, positioning support; 110, handle; 120, fixed plate; 130, screw rod; 140, hand wheel;

[0041] 200, connecting frame; 210, load-bearing rod; 220, avoiding groove; 230, friction plate;

[0042] 300, pendulum; 310, hammer head; 320, hammer handle; 321, sliding waist groove;

[0043] 400, rotation guide set; 410, guide ring; 411, guide arc groove; 4111, first arc groove; 4112, second arc groove; 4113, communication notch; 420, guide column;

[0044] 500, control switch;

[0045] 600, translation guide set; 610, fixed sleeve; 620, moving sleeve; 630, clamping jaw; 640, transmission element; 641, rotation sleeve; 642, end connecting ring; 6421, inclined sliding groove; 643, sliding column; 644, limiting block; 645, first elastic element;

[0046] 700, measuring needle. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the embodiments and in conjunction with the drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0048] The serial numbers of components in this document, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. In the description of the present application, it should be understood that the terms "connect", "couple" include direct and indirect connections (couplings) unless otherwise specified. In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0049] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0050] As shown in Figures 1 to 10 A device for detecting the strength of masonry mortar by pendulum knock-in method includes a positioning support 100, a connecting frame 200, a pendulum 300, a rotation guide set 400, a control switch 500, a translation guide set 600, and a measuring needle 700. The connecting frame 200 is arranged on the upper part of the positioning support 100, the pendulum 300 is rotatably arranged on the connecting frame 200, the rotation guide set 400 is connected between the connecting frame 200 and the pendulum 300, the rotation guide set 400 is used to make the pendulum 300 move in a horizontal direction within a predetermined range after freely swinging down to the lowest point, the control switch 500 is arranged on the connecting frame 200, the control switch 500 is used to control the release of the pendulum 300, the translation guide set 600 is arranged on the lower part of the positioning support 100, and the measuring needle 700 is slidably arranged in the translation guide set 600.

[0051] In use, the worker vertically stands the positioning support 100 on the mortar surface of the measuring point, ensures that the tip of the measuring needle 700 is in close contact with the mortar, and fixes the positioning support 100 to the wall surface. Next, the worker lifts the pendulum 300 to a specified height, and locks it in the position by controlling the switch 500. In detection, the worker releases the pendulum 300 by controlling the switch 500. At this time, the pendulum 300 freely swings downward under the action of its own gravity, and moves in the horizontal direction within a preset range under the guidance of the rotating guide assembly 400. In this way, the measuring needle 700 is not easy to tilt upward in the vertical direction during the movement of the measuring needle 700 within the preset range, and the tip of the measuring needle 700 can be horizontally inserted into the mortar of the measuring point, so as to facilitate more accurate detection data. In addition, since the force applied to the measuring needle 700 by the pendulum 300 does not have a component in the vertical direction, the universal applicability of the device is better, and it is more suitable for detecting mortar of measuring points with low strength.

[0052] In further embodiments, as shown in Figure 6 and Figure 7 The rotating guide assembly 400 includes guide rings 410 and a guide column 420. The two guide rings 410 are arranged on the connecting frame 200 along the first axis and are spaced apart. The opposite surfaces of the two guide rings 410 are provided with guide arc grooves 411. The guide column 420 is arranged at the end of the handle 320 of the pendulum 300, and the two ends of the guide column 420 can slide along the guide arc grooves 411. After the pendulum 300 freely swings downward to the lowest point, the guide column 420 continues to slide along the guide arc grooves 411, so that the distance between the center of the guide column 420 and the center of the guide ring 410 decreases. For the groove shape of the guide arc grooves 411, specifically, the guide arc grooves 411 include a first arc groove 4111 and a second arc groove 4112, which are sequentially connected in the counterclockwise direction. The first arc groove 4111 is concentric with the guide ring 410, and the center of the second arc groove 4112 is located below the center of the first arc groove 4111.

[0053] In use, the worker lifts the pendulum 300 upward, so that the guide post 420 fixedly connected to the side of the hammer handle 320 of the pendulum 300 slides to the end groove bottom of the first arc groove 4111, at this time the pendulum 300 is lifted to the preset position, then the worker releases the pendulum 300, at this time the pendulum 300 is blocked by the control switch 500 and cannot be released downward, then the worker releases the pendulum 300 through the control switch 500, at this time the pendulum 300 freely swings downward under the action of its own gravity, in the process of the pendulum 300 freely swinging downward from the highest point to the lowest point, the guide post 420 gradually slides from the end of the first arc groove 4111 to the junction position of the first arc groove 4111 and the second arc groove 4112, after the pendulum 300 freely swings downward from the highest point to the lowest point, the pendulum 300 continues to swing under the action of its own inertia force, so the guide post 420 gradually slides from the junction position of the second arc groove 4112 and the first arc groove 4111 to the end of the second arc groove 4112, since the center of the second arc groove 4112 is located below the center of the first arc groove 4111, therefore the hammer head 310 of the pendulum 300 is constrained to a horizontal straight line in the movement track under the action of the rotating guide sleeve 400 after swinging to the lowest point, so the vertical components of the divided movements cancel each other out, only the horizontal force is reserved, so the measuring needle 700 does not have a vertical component when it is subjected to the force from the pendulum 300, therefore the tip of the measuring needle 700 does not easily tilt upward in the process of moving in the preset range, which is beneficial to make the detection data more accurate.

[0054] Further, as shown in Figure 3 , one end surface of the hammer head 310 is circular, and the center of the end surface of the hammer head 310 protrudes outward to form a spherical surface, which is the same as the end surface profile of the existing cylindrical rubber hammer, so as to adapt to the existing measuring needle 700 profile (the end thereof is also usually circular, and the middle part is arched upward). In this way, when the hammer head 310 contacts the measuring needle 700, the contact surface is as small as possible, the force is concentrated at one point, so as to increase the pressure per unit area, so as to improve the knocking efficiency and effect.

[0055] When the hammer head 310 and the tail end of the measuring needle 700 repeatedly collide, causing the contact surface of the hammer head 310 to be damaged, such as being concave or deformed, a lateral component may be generated when the hammer head 310 contacts the tail end of the measuring needle 700, in order to solve this problem, further, as shown in Figure 3 , the contact point between the hammer head 310 and the measuring needle 700 after freely swinging is slightly offset from the axis of the measuring needle 700, and the hammer head 310 is rotatably connected to the hammer handle 320, rather than being fixedly installed on the hammer handle 320.

[0056] In this way, the hammer head 310 can be rotated by a certain angle after each use, so as to avoid the hammer head 310 from being damaged and deformed due to long-term force on a certain position.

[0057] Further, the connecting frame 200 can move in the vertical direction relative to the positioning support 100, so that the position of the pendulum 300 can be finely adjusted, so that the contact point of the hammer head 310 after free swinging is slightly offset from the axis of the measuring needle 700, specifically, a fixed plate 120 is arranged on the positioning support 100, the fixed plate 120 is rotatably connected with a screw rod 130, the screw rod 130 is threadedly connected with the connecting frame 200, and the upper end of the screw rod 130 is provided with a hand wheel 140. In addition, the side surface of the connecting frame 200 is in sliding abutment with the side surface of the positioning support 100, which is used to limit the movement of the connecting frame 200, so that the connecting frame 200 can move in the vertical direction.

[0058] Further, both ends of the hammer head 310 can be used as a working surface, after a period of use, the worker can disassemble the hammer head 310 from the hammer handle 320, and reverse the left and right positions of the hammer head 310.

[0059] Further, the control switch 500 can be a latch, which is slidingly inserted into the connecting frame 200. After the pendulum 300 is lifted to a specified height, the worker inserts the latch into the connecting frame 200. At this time, under the blocking action of the latch, the pendulum 300 cannot freely swing downward. When the pendulum 300 needs to freely swing downward, the worker pulls the latch outward. At this time, the latch no longer limits the downward swinging of the pendulum 300. At this time, the pendulum 300 can freely swing downward. In other embodiments, the control switch 500 can also be a spring return button. Compared with the latch, the spring return button is more convenient to use.

[0060] In further embodiments, as shown in Figure 3 , Figure 6 and Figure 7 , a sliding waist groove 321 is formed in the side surface of the hammer handle 320 of the pendulum 300, a load bearing rod 210 is coaxially and rotatably arranged between the two guide rings 410, and the load bearing rod 210 is slidingly connected in the sliding waist groove 321.

[0061] The load bearing rod 210 is arranged to share the force borne by the guide column 420, and the sliding waist groove 321 is arranged on the side of the hammer handle 320 to adapt the guide column 420 to the guide arc groove 411. Specifically, during the movement of the guide column 420 in the first arc groove 4111, the load bearing rod 210 is always connected to the end of the sliding waist groove 321. When the guide column 420 slides into the second arc groove 4112, as the guide column 420 continues to slide along the second arc groove 4112, the load bearing rod 210 moves to the middle of the sliding waist groove 321, so that the pendulum 300 can move in the preset range along the horizontal direction after swinging to the lowest point.

[0062] After each measurement, the pendulum 300 is manually swung to the highest point, and the resetting method causes the load bearing rod 210 to rotate reciprocatingly within a half circle. However, this unique resetting method causes the local area of the load bearing rod 210 to be severely worn. To solve this problem, in further embodiments, as shown in Figure 3 and Figure 4 The two ends of the hammer handle 320 of the pendulum 300 are provided with the hammer head 310, the two end faces of the hammer head 310 are circular, and the center of the end face is outwardly raised. The guide column 420 has two, and the two guide columns 420 are selectively connected to the guide arc groove 411 at the two ends of the hammer handle 320 of the pendulum 300. To enable the two guide columns 420 to be selectively connected to the guide arc groove 411, a communication groove 4113 is arranged at the upper and lower positions of the guide ring 410. The communication groove 4113 at the upper position of the guide ring 410 is between the first arc groove 4111 and the second arc groove 4112, and the communication groove 4113 at the lower position of the guide ring 410 is connected to the end of the first arc groove 4111.

[0063] When detecting the next detection point of the masonry mortar, the staff first fixes the positioning support 100 at the next detection point, and then manually resets the pendulum 300. Specifically, the staff first reversely rotates the pendulum 300 until the guide column 420 on the pendulum 300 corresponds to the position of the communication notch 4113, and then the staff manually lifts the pendulum 300, so that the guide column 420 at the lower part of the pendulum 300 slides into the guide ring 410 through the communication notch 4113, and the guide column 420 at the upper part of the pendulum 300 slides out of the guide ring 410 through the communication notch 4113, and then the staff counterclockwise rotates the pendulum 300 (i.e. along the free pendulum direction of the pendulum 300), until the guide column 420 on the pendulum 300 slides to the end position of the first arc groove 4111 beyond the communication notch 4113, at this time, the two hammer heads 310 are switched in position, i.e. the resetting is completed. In the resetting process, the overall rotation direction of the pendulum 300 is the same as the movement direction of the free pendulum of the pendulum 300, rather than reciprocating rotation within half a circle, so that the problem of serious wear of the local area of the bearing rod 210 can be effectively solved. Then the staff releases the pendulum 300 through the control switch 500, and the free pendulum of the pendulum 300 can complete the detection of the current detection point.

[0064] It can be understood that, by arranging the hammer head 310 at both ends of the hammer handle 320, compared with arranging the hammer head 310 at only one end of the hammer handle 320, the resetting stroke can be shortened by half, which is beneficial to save the resetting time and improve the use efficiency. In addition, the arrangement of the double hammer heads 310 can make the two hammer heads 310 alternately put into use, which is beneficial to improve the service life of the hammer head 310.

[0065] Further, in order to enable the lower hammer head 310 to pass through the connecting frame 200 without interfering with the connecting frame 200, specifically, the avoiding groove 220 is arranged on the connecting frame 200, and the size of the avoiding groove 220 is matched with the movement track of the lower hammer head 310.

[0066] Further, in order to facilitate the staff to rotate the hammer head 310, specifically, the friction plate 230 is arranged at the bottom of the connecting frame 200. When the staff lifts the pendulum 300, the side surface of the hammer head 310 rolls in contact with the friction plate 230, so as to forcibly rotate the hammer head 310 by a certain angle, so as to facilitate switching the contact position of the hammer head 310 and the measuring needle 700.

[0067] In a further embodiment, as Figures 8-10As shown, the translation guide set 600 comprises a fixed sleeve 610, a moving sleeve 620, a plurality of clamping jaws 630 and a transmission member 640. The fixed sleeve 610 is arranged on the positioning support 100. The moving sleeve 620 is slidingly arranged in the fixed sleeve 610. The plurality of clamping jaws 630 are arranged in the fixed sleeve 610 at equal intervals in the circumferential direction and can simultaneously move towards or away from the axis of the fixed sleeve 610. The transmission member 640 is connected between the plurality of clamping jaws 630 and the moving sleeve 620. When the moving sleeve 620 moves towards the inside of the fixed sleeve 610, the plurality of clamping jaws 630 are simultaneously moved away from the axis of the fixed sleeve 610 by the transmission member 640.

[0068] In the initial state, the measuring needle 700 is clamped by the plurality of clamping jaws 630, which prevents the measuring needle 700 from moving along its own axis and prevents relative shaking between the measuring needle 700 and the translation guide set 600 before the pendulum 300 contacts the measuring needle 700.

[0069] After the pendulum 300 freely swings down, the pendulum 300 first contacts the tail end of the measuring needle 700 and pushes the tip of the measuring needle 700 to insert into the mortar of the measuring point. Subsequently, the pendulum 300 continues to move under the action of inertia, contacts the moving sleeve 620 and pushes the moving sleeve 620 to move along the axis. Since the transmission member 640 is configured to simultaneously move the plurality of clamping jaws 630 away from the axis of the fixed sleeve 610 when the moving sleeve 620 moves towards the inside of the fixed sleeve 610, the plurality of clamping jaws 630 no longer hinder the measuring needle 700 from continuously inserting into the mortar of the measuring point at this time, which prevents the loss of excessive force transmitted from the pendulum 300 to the measuring needle 700.

[0070] Further, in order to guide the movement of the plurality of clamping jaws 630, a limiting block 644 is arranged on one side of the clamping jaw 630. A guide groove is arranged in the fixed sleeve 610 and extends along the radial direction of the fixed sleeve 610. The limiting block 644 is slidingly connected in the guide groove.

[0071] Further, the transmission member 640 comprises a rotating sleeve 641, an end connecting ring 642 and a sliding column 643, the rotating sleeve 641 is rotationally connected in the fixed sleeve 610, one end of the rotating sleeve 641 is coaxially provided with the end connecting ring 642, the end connecting ring 642 is screw-connected with the moving sleeve 620, specifically, the end connecting ring 642 is provided with a screw strip, the inner side of the moving sleeve 620 is provided with a screw groove, the screw strip is matched in the screw groove, the inner part of the end connecting ring 642 is provided with an inclined sliding groove 6421, the extending direction of the inclined sliding groove 6421 is arranged at an angle with the radial direction of the end connecting ring 642, one side of the clamping jaw 630 is rotationally provided with the sliding column 643, the sliding column 643 is slidingly connected in the inclined sliding groove 6421. When the moving sleeve 620 moves, the rotating sleeve 641 is rotated through the screw cooperation between the moving sleeve 620 and the rotating sleeve 641, the rotation of the rotating sleeve 641 drives the sliding column 643 to drive the clamping jaw 630 to move away from the axis of the fixed sleeve 610 through the inclined sliding groove 6421, thus the clamping jaw 630 no longer hinders the measuring needle 700 to continue to move into the mortar of the measuring point.

[0072] Further, in order to improve the detection accuracy, the energy consumed in the transmission process of the transmission member 640 can be measured, and then combined with the rated kinetic energy required by the measuring needle 700 to calculate the gravitational potential energy of the required pendulum 300, so that the kinetic energy received by the measuring needle 700 after the pendulum 300 hits the measuring needle 700 is the rated kinetic energy.

[0073] Further, in order to facilitate the resetting of the moving sleeve 620, specifically, the first elastic member 645 is sleeved outside the rotating sleeve 641, one end of the first elastic member 645 abuts against the groove wall of the fixed sleeve 610, and the other end of the first elastic member 645 abuts against the moving sleeve 620.

[0074] In further embodiments, the left and right sides of the positioning bracket 100 are provided with handles 110, which are convenient for the staff to hold and operate.

[0075] Further, the device is designed as a double-hammer-head structure, which can move the center of gravity of the pendulum 300 to the middle position of the pendulum 300, so that the staff holds the handle 110 to make the positioning bracket 100 more labor-saving when maintaining the posture.

[0076] The technical features of the above embodiments can be combined arbitrarily, in order to make the description simple, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0077] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A device for detecting the strength of masonry mortar by means of the pendulum knock-in method, characterised in that, The utility model relates to a kind of positioning support, connecting frame, pendulum, rotating guide kit, control switch, translation guide kit and measuring needle. Positioning support; Connecting frame is arranged in the upper part of positioning support; Pendulum is rotationally arranged on connecting frame; Rotating guide kit is connected between connecting frame and pendulum, for making pendulum move in preset range along horizontal direction after freely falling to lowest point; Control switch is arranged on connecting frame, for controlling release of pendulum; Translation guide kit is arranged in the lower part of positioning support; Measuring needle is slidingly arranged in translation guide kit; The rotating guide kit includes guide ring and guide column, the guide ring has two, the two guide rings are arranged along the first axis and spaced apart on the connecting frame, and the opposite surfaces of the two guide rings are provided with guide arc grooves, the guide column is arranged at the end of the hammer handle of the pendulum, and the two ends of the guide column can slide along the guide arc grooves; After pendulum freely falls to lowest point, the guide column continues to slide along the guide arc grooves, so that the distance between the center of the guide column and the center of the guide ring decreases; 2. A device for detecting the strength of masonry mortar by the pendulum knock-in method according to claim 1, characterized in that The side surface of the hammer handle of the pendulum is provided with a sliding waist groove, a load-bearing rod is coaxially and rotationally arranged between the two guide rings, and the load-bearing rod is slidingly connected in the sliding waist groove; 3. A device for detecting the strength of masonry mortar by the pendulum knock-in method according to claim 2, characterized in that The translation guide kit includes fixed sleeve, moving sleeve, clamping jaw and transmission member, the fixed sleeve is arranged on the positioning support, the moving sleeve is slidingly arranged in the fixed sleeve, the clamping jaw has a plurality of clamping jaws, the plurality of clamping jaws are circumferentially and equally spaced arranged in the fixed sleeve, and the plurality of clamping jaws can simultaneously approach or move away from the axis of the fixed sleeve, and the transmission member is connected between the plurality of clamping jaws and the moving sleeve; 4. A device for detecting the strength of masonry mortar by the pendulum knock-in method according to claim 2, characterized in that When the moving sleeve moves towards the inside of the fixed sleeve, the plurality of clamping jaws are simultaneously moved away from the axis of the fixed sleeve by the transmission member.

5. A device for detecting the strength of masonry mortar by the pendulum knock-in method according to claim 2, characterized in that The hammer handle of the pendulum is provided with a hammer head at both ends, the guide column has two, the two guide columns are respectively arranged at the end of the hammer handle of the pendulum, and the two guide columns are selectively slidingly connected in the guide arc grooves.

6. A device for detecting the strength of masonry mortar by means of the pendulum knock-in method according to claim 1, characterized in that One end surface of the hammer head is circular, and the center of the end surface protrudes outward.

7. A device for detecting the strength of masonry mortar by means of the pendulum knock-in method according to claim 1, characterized in that Both end surfaces of the hammer head are circular, and the center of the end surface protrudes outward. The hammer head is rotationally arranged on the hammer handle. The connecting frame can move along the vertical direction relative to the positioning support. The left and right sides of the positioning support are provided with handles.

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