Center hole depth gauge

Abstract

The utility model discloses a center hole depth testing fixture, which relates to the technical field of workpiece detection, and comprises a shell, a central hole, a central hole, a central hole and a central hole, the detection assembly is arranged in the shell and can detect the depth of the center hole; wherein the detection assembly comprises a connecting base, a limiting pin is installed in the connecting base, and the limiting pin is connected with the inner wall of the connecting base through a spring. According to the center hole depth testing fixture of the utility model, the telescopic locking head is adopted to hook the step of the center hole, so that the extension rod cannot be retracted, and the length of the extension rod extending into the center hole is equal to the length from the center hole to the position of the step, and therefore, the depth of the center hole can be accurately tested. The technical problem that when an existing center hole depth detection device is used, a step-shaped center hole cannot be directly detected is effectively solved, direct detection of the depth of the step-shaped center hole is further achieved, and therefore the detection efficiency of a workpiece is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of workpiece detection, in particular to a center hole depth detection tool. Background Art

[0002] The center hole is an important process for various parts. Its size determines the assembly and use accuracy, and further determines the stability and service life of the parts. Traditional detection methods are relatively inefficient, and repeatability and reproducibility are difficult to guarantee. Existing center hole depth detection instruments have problems such as complex operation and low detection accuracy.

[0003] At present, the Chinese patent with the existing patent application number "CN202020999150.9" discloses a special center hole depth gauge, including: a dial indicator, a clamping ring, a screw, a measuring handle, a compression spring, a push rod, an elastic retaining ring for the shaft, a clamp body, a mandrel, and a hard alloy steel ball. The hard alloy steel ball is connected to the mandrel, the mandrel is in contact with the push rod, and the push rod is in contact with the probe of the dial indicator, so that the measured displacement is transmitted to the dial indicator to obtain the measurement data. In addition, the Chinese patent with the existing patent application number "CN201620914152.7" discloses a center hole depth gauge, including a gauge body and a calibration block. A measuring rod is installed in the gauge body, the upper end of the measuring rod is connected to the measuring needle, the measuring needle is connected to the dial indicator, and the lower end of the measuring rod is connected to the measuring steel ball. Although the above patents can improve the detection efficiency to a certain extent, they are mainly aimed at through holes with a bottom, and cannot directly detect the stepped center hole. In this case, tools are needed. For example, a sphere or baffle that can block the movement of the probe is placed at the other end of the center hole. In this way, after the probe is inserted into the center hole, it will be blocked, thereby detecting the depth of the center hole. This method is time-consuming and labor-intensive, and it also seriously affects the detection efficiency.

[0004] However, during the implementation of the above technical solution, it was found that there were at least the following technical problems:

[0005] It is impossible to directly detect the stepped center hole: It can be seen from the above patent that the existing center hole detection method mainly adopts the insertion detection, that is, when the probe of the rangefinder penetrates into the bottom of the center hole, it encounters resistance. At this time, the length of the probe inserted into the center hole is the depth of the center hole. However, for Figure 7The center hole shown is not applicable. This is because there is no obstruction at the other end of the stepped center hole, which makes it impossible to judge the depth of the center hole based on the penetration length of the probe. At this time, it is necessary to use tools for auxiliary detection. For example, a sphere or baffle that can block the movement of the probe is placed at the other end of the center hole. In this way, after the probe is inserted into the center hole, it will be blocked, thereby detecting the depth of the center hole. This method is time-consuming and labor-intensive, and it also seriously affects the efficiency of detection. For this reason, we propose a center hole depth inspection tool. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] In view of the deficiencies in the prior art, the utility model provides a center hole depth gauge, which adopts a retractable locking head to hook the step of the center hole, so that the extension rod cannot be retracted. At this time, the length of the extension rod extended into the center hole is the same as the length from the center hole to the position of the step, thereby realizing direct detection of the depth of the step-type center hole, thereby improving the detection efficiency of the workpiece and solving the technical problem that the existing center hole depth detection device cannot directly detect the step-type center hole when in use.

[0008] (II) Technical solution

[0009] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0010] A center hole depth gauge, the gauge comprising:

[0011] a housing, on top of which a rangefinder is mounted;

[0012] A detection component is arranged inside the housing and connected to the rangefinder to detect the depth of the center hole;

[0013] Among them, the detection component includes a connecting seat, and the connecting seat and the rangefinder are connected through an extension rod. A limit pin is installed on the left and right of the connecting seat, and the limit pin is connected to the inner wall of the connecting seat through a spring. In this way, when the connecting seat moves to the end of the center hole, the limit pin inside the connecting seat is expanded under the action of the spring force, thereby hooking the inner wall of the center hole, thereby completing the fixation of the extension rod, and the length of the extension rod extending into the center hole is consistent with the depth of the center hole.

[0014] Preferably, a limiting sleeve is provided on the outside of the shell, and the limiting sleeve mainly consists of two parts, and the two parts are integrally formed. One part is a spring sleeve mounted on the outside of the shell, and the other part is a workpiece sleeve connected to the bottom of the spring sleeve. In order to ensure a stable connection between the workpiece sleeve and the workpiece, the inner diameter of the workpiece sleeve is consistent with the outer diameter of the workpiece. Therefore, during inspection, the extension rod at the center can be inserted into the center hole by mounting the workpiece sleeve on the outside of the workpiece.

[0015] Preferably, an annular retaining ring is connected to the interior of the spring sleeve, and the retaining ring is connected to one end of the shell inserted into the limiting sleeve through a spring, so when the shell moves in the direction of the limiting sleeve, the spring located between the bottom of the shell and the retaining ring is compressed.

[0016] Preferably, a limit ring is installed inside the spring sleeve, and the limit ring is located below the retaining ring, and is used to prevent the retaining ring from moving downward, thereby limiting the position of the retaining ring. In order to avoid the retaining ring passing through the limit ring, it is necessary to ensure that the inner diameter of the limit ring is smaller than the outer diameter of the retaining ring, and when the retaining ring and the limit ring are in fit, the bottom surface of the retaining ring is flush with the inner top surface of the workpiece sleeve.

[0017] Preferably, a traction rope is connected to the side of the limit pin facing the connecting seat, and the other end of the traction rope extends upward along the extension rod and is connected to the traction assembly inside the extension rod; when the traction assembly pulls the traction rope, the limit pin connected to the other end of the traction rope shrinks into the connecting seat.

[0018] Preferably, the traction assembly comprises an inner rod connected between the locking head and the probe of the rangefinder, and the outer sleeve of the inner rod is provided on the outer sleeve, the linkage plate is provided on the side of the outer sleeve facing the inner rod, and the inner rod and the outer sleeve can move relative to each other, so when the inner rod and the outer sleeve move relative to each other, the limit pin at the end thereof can be pulled by the traction rope to retract toward the inside of the connecting seat, and the inner rod is connected between the probe and the locking head;

[0019] Wherein, one end of the traction rope away from the limiting pin passes around the pulley inside the inner rod and is connected to the top of the linkage plate.

[0020] Preferably, a retractable assembly is connected between the inner rod and the outer cylinder, and the inner rod and the outer cylinder are driven to move relative to each other by the retractable assembly;

[0021] Wherein, the retractable assembly comprises side plates respectively connected to the inner rod and the outer cylinder, and both side plates are hinged to the same extrusion plate through a connecting rod;

[0022] When the compression plate is pressed, the outer cylinder moves toward the bottom of the inner rod.

[0023] Preferably, a guide groove is provided on the outer wall of the shell, and the retractable assembly is arranged in the guide groove on the shell surface, so that when the extension rod moves up and down, the retractable assembly can be driven to slide up and down along the guide groove, thereby reserving sufficient space for the movement of the retractable assembly.

[0024] (III) Beneficial effects

[0025] 1. Since a retractable locking head is used to hook the step of the center hole, the extension rod cannot be retracted. At this time, the length of the extension rod inserted into the center hole is the same as the length from the center hole to the position of the step. Therefore, the technical problem that the existing center hole depth detection device cannot directly detect the step-type center hole when in use is effectively solved, and the direct detection of the step-type center hole depth is realized, thereby improving the detection efficiency of the workpiece.

[0026] 2. Since the inner rod and the outer cylinder are connected together by a sleeve connection, and one end of the traction rope is connected to the outer cylinder, and the other end is connected to the rear end of the limit pin, when the inner rod and the outer cylinder move relative to each other, the traction rope can be pulled to make the limit pin at the other end of the traction rope retract into the connecting seat. In addition, the extrusion plate is respectively connected to the inner rod and the outer cylinder through the connecting rod. When the extrusion plate is pressed, the inner rod and the outer cylinder can be separated from each other under the conduction action of the connecting rod, thereby facilitating one-handed operation and improving the convenience of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings.

[0028] Figure 1 This is an overall structural diagram of an embodiment of the utility model;

[0029] Figure 2 A cross-sectional view of a housing in an embodiment of the utility model;

[0030] Figure 3 This is a schematic diagram of the structure of the rangefinder and the extension rod in the embodiment of the utility model;

[0031] Figure 4 This is a schematic diagram of the structure of the extension rod in the embodiment of the utility model;

[0032] Figure 5 It is a cross-sectional schematic diagram of the extension rod in the embodiment of the utility model;

[0033] Figure 6 It is a cross-sectional view of the locking head in the embodiment of the utility model;

[0034] Figure 7 It is a schematic diagram of the installation of the device in the embodiment of the utility model.

[0035] Legend:

[0036] 1. Shell;

[0037] 2. Rangefinder;

[0038] 31. Probe; 32. Extension rod; 321. Inner rod; 322. Outer cylinder; 323. Linking plate; 324. Traction rope; 325. Pulley; 33. Locking head; 331. Connecting seat; 332. Limit pin; 34. Stop ring;

[0039] 4. Limit sleeve; 41. Spring sleeve; 42. Workpiece sleeve;

[0040] 5. retractable assembly; 51. extrusion plate; 52. connecting rod; 53. side plate. DETAILED DESCRIPTION

[0041] The embodiment of the present application provides a center hole depth gauge, which effectively solves the technical problem that the existing center hole depth detection device cannot directly detect the step-type center hole when in use. When the existing center hole depth detection device is in use, a retractable locking head is used to hook the step of the center hole, so that the extension rod cannot be retracted. At this time, the length of the extension rod extended into the center hole is the same as the length from the center hole to the position of the step, thereby realizing direct detection of the step-type center hole depth, thereby improving the detection efficiency of the workpiece.

[0042] Example 1

[0043] The technical solution in the embodiment of the present application effectively solves the technical problem that the existing center hole depth detection device cannot directly detect the stepped center hole when in use. The overall idea is as follows:

[0044] In view of the problems existing in the prior art, the utility model provides a center hole depth gauge, which includes a housing 1 and a detection component arranged inside the housing 1, and the detection component is connected to a distance meter 2 on the housing 1, and the depth of the center hole is detected by the detection component, and then displayed by the distance meter 2 thereon, such as Figure 1 and Figure 2 As shown, the specific structure of the detection component is as follows:

[0045] A cylindrical locking head 33 and an extension rod 32 for connecting the locking head 33 to the probe 31 of the rangefinder 2. The locking head 33 is used to hook the stepped surface of the center hole after the extension rod 32 penetrates into the center hole. Figure 7 As shown, at this time, the extension rod 32 cannot be retracted, so the depth of the center hole can be calculated by calculating the length of the extension rod 32 penetrating into the center hole, but the influence of the size of the locking head 33 needs to be eliminated. The size of the locking head 33 before and after installation can also be measured to understand the influence of the locking head 33.

[0046] The locking head 33 includes a connecting seat 331, and a limit pin 332 is installed on the left and right of the connecting seat 331, and the limit pin 332 is connected to the inner wall of the connecting seat 331 through a spring, so that when the connecting seat 331 moves to the end of the center hole, the limit pin 332 inside the connecting seat 331 is expanded under the action of the spring force, thereby hooking the inner wall of the center hole, thereby completing the fixation of the extension rod 32.

[0047] In order to ensure that the locking head 33 can stably enter the center hole of the workpiece, a limiting sleeve 4 is sleeved on the outside of the housing 1, and the limiting sleeve 4 is sleeved on the workpiece. Figure 7 As shown, the limiting sleeve 4 is mainly composed of two parts, and the two parts are integrally formed. One part is a spring sleeve 41 sleeved on the outside of the shell 1, and the other part is a workpiece sleeve 42 connected to the bottom of the spring sleeve 41. In order to ensure a stable connection between the workpiece sleeve 42 and the workpiece, the inner diameter of the workpiece sleeve 42 is consistent with the outer diameter of the workpiece. Therefore, during detection, the extension rod 32 at the center can be inserted into the center hole by sleeved on the outside of the workpiece through the workpiece sleeve 42.

[0048] The spring sleeve 41 is internally connected with an annular retaining ring 34, and the retaining ring 34 is connected to one end of the housing 1 inserted into the limiting sleeve 4 through a spring, so when the housing 1 moves toward the direction where the limiting sleeve 4 is located, the spring between the bottom of the housing 1 and the retaining ring 34 is compressed. Figure 7 As shown in (a) to (b), after the housing 1 is released, the housing 1 and the retaining ring 34 are expanded under the action of the spring to form a Figure 7 As shown in (c), since the extension rod 32 is fixed and cannot move, the probe 31 connected to the extension rod 32 is pulled, so the length of the center hole can be judged by observing the detection result of the rangefinder 2 and the original length of the extension rod 32 extending out of the housing 1. In order to prevent the retaining ring 34 from entering the center hole, it is necessary to ensure that the outer diameter of the retaining ring 34 is larger than the inner diameter of the center hole to be detected.

[0049] A limit ring is installed inside the spring sleeve 41. The limit ring is located below the retaining ring 34 and is used to prevent the retaining ring 34 from moving downward, thereby limiting the position of the retaining ring 34. In order to prevent the retaining ring 34 from passing through the limit ring, it is necessary to ensure that the inner diameter of the limit ring is smaller than the outer diameter of the retaining ring 34, and when the retaining ring 34 is fitted with the limit ring, the bottom surface of the retaining ring 34 is flush with the inner top surface of the workpiece sleeve 42. Figure 2 shown.

[0050] In order to reset the limit pin 332, a traction rope 324 is connected to the side of the limit pin 332 facing the connecting seat 331, and the other end of the traction rope 324 extends upward along the extension rod 32, passes around the pulley 325 inside the inner rod 321, and is connected to the top of the linkage plate 323. Figure 5 As shown, the linkage plate 323 is arranged on the side of the outer tube 322 facing the inner rod 321, and the inner rod 321 and the outer tube 322 can move relative to each other, so when the inner rod 321 and the outer tube 322 move relative to each other, the limiting pin 332 at its end can be pulled toward the inside of the connecting seat 331 by the traction rope 324, and the inner rod 321 is connected between the probe 31 and the locking head 33.

[0051] In the specific implementation process, the device is installed on the top of the workpiece to be measured, that is, the shell 1 corresponds to the center hole of the workpiece to be measured, and then moved downward so that the limiting sleeve 4 outside the shell 1 is sleeved on the outside of the workpiece. At this time, the extension rod 32 and the locking head 33 at the center of the shell 1 are inserted into the center hole of the workpiece. Figure 7 As shown in (a), the shell 1 is then pressed to move it downward, squeezing the spring between it and the retaining ring 34 until the locking head 33 at the end of the extension rod 32 moves to the step position of the center hole. At this time, the limit pin 332 inside the connecting seat 331 is expanded under the action of the spring force, thereby hooking the inner wall of the center hole.

[0052] Release the housing 1. At this time, the housing 1 moves upward under the action of the spring below it (the spring is always in a compressed state), but the locking head 33 at the end of the extension rod 32 hooks the stepped surface of the center hole and cannot move upward. Figure 7 As shown in (b), during the upward movement of the shell 1, the probe 31 connected to the extension rod 32 is stretched, and the rangefinder 2 starts to detect until the bottom of the shell 1 is completely in contact with the top of the limiting sleeve 4. The length of the extension rod 32 and the locking head 33 extending into the center hole is recorded as the depth of the center hole. At this time, the depth of the center hole can be obtained.

[0053] After the detection is completed, the outer cylinder 322 is pulled to make the inner rod 321 and the outer cylinder 322 move relative to each other. When the inner rod 321 and the outer cylinder 322 move relative to each other, the limiting pin 332 at its end can be pulled toward the inside of the connecting seat 331 by the traction rope 324 to complete the retraction and extension of the limiting pin 332.

[0054] Example 2

[0055] Based on Example 1, the present application provides a retractable structure capable of controlling the relative movement between the inner rod and the outer cylinder. The overall idea is as follows:

[0056] The retractable structure is arranged between the inner rod 321 and the outer cylinder 322, and is used to drive the inner rod 321 and the outer cylinder 322 to move relative to each other; the retractable assembly 5 includes side plates 53 connected to the inner rod 321 and the outer cylinder 322, respectively, and the two side plates 53 are hinged to the same extrusion plate 51 through the connecting rod 52; Figure 3 and Figure 4As shown, when the extrusion plate 51 is pressed, the pressure on the extrusion plate 51 is transmitted along the connecting rod 52 toward the inner rod 321 and the outer cylinder 322, so that the outer cylinder 322 moves toward the bottom of the inner rod 321. At this time, the inner rod 321 and the outer cylinder 322 move relative to each other, and the traction rope 324 connected between the inner rod 321 and the outer cylinder 322 is pulled, so that the limit pin 332 connected to the traction rope 324 shrinks toward the inside of the connecting seat 331, completing the retraction and extension of the limit pin 332.

[0057] In order to prevent the retractable component 5 from interfering with the shell 1 during movement, the retractable component 5 is set in a guide groove on the surface of the shell 1, so that when the extension rod 32 moves up and down, the retractable component 5 can be driven to slide up and down along the guide groove, thereby reserving sufficient space for the movement of the retractable component 5.

[0058] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A center hole depth gauge, characterized in that: The test fixture includes: A housing (1) having a rangefinder (2) mounted on the top thereof; A detection component is arranged inside the housing (1) and connected to the distance meter (2) to detect the depth of the center hole; The detection assembly comprises a connecting seat (331), and the connecting seat (331) is connected to the rangefinder (2) via an extension rod (32), two mutually corresponding limit pins (332) are installed inside the connecting seat (331), and the limit pins (332) are connected to the inner wall of the connecting seat (331) via a spring; When the connecting seat (331) moves to the end of the center hole, the limiting pin (332) inside the connecting seat (331) is unfolded under the action of the spring force, and the length of the extension rod (32) extending into the center hole is consistent with the depth of the center hole.

2. A center hole depth gauge as claimed in claim 1, characterized in that: The outer part of the housing (1) is provided with a limiting sleeve (4), and the limiting sleeve (4) is located at one end of the housing (1) close to the locking head (33), and the limiting sleeve (4) comprises a spring sleeve (41) which is sleeved on the outer part of the housing (1) and a workpiece sleeve (42) which is connected to the bottom of the spring sleeve (41); During detection, the workpiece sleeve (42) is sleeved on the outside of the workpiece.

3. A center hole depth gauge as claimed in claim 2, characterized in that: The spring sleeve (41) is internally connected with a retaining ring (34), and the retaining ring (34) is connected to one end of the housing (1) inserted into the limiting sleeve (4) through a spring, and the retaining ring (34) is located outside the extension rod (32); The outer diameter of the retaining ring (34) is greater than the inner diameter of the central hole to be detected, and when the housing (1) moves in the direction of the limiting sleeve (4), the spring between the bottom of the housing (1) and the retaining ring (34) is compressed.

4. A center hole depth gauge as claimed in claim 3, characterized in that: The inner wall of the spring sleeve (41) is provided with a limiting ring, and the limiting ring is located below the retaining ring (34), and the inner diameter of the limiting ring is smaller than the outer diameter of the retaining ring (34); When the retaining ring (34) is in contact with the limiting ring, the bottom surface of the retaining ring (34) is flush with the inner top surface of the workpiece sleeve (42).

5. A center hole depth gauge as claimed in claim 1, characterized in that: The limiting pin (332) is connected to a traction rope (324) on one side facing the connecting seat (331), and the other end of the traction rope (324) extends upward along the extension rod (32) and is connected to a traction assembly inside the extension rod (32); when the traction assembly pulls the traction rope (324), the limiting pin (332) connected to the other end of the traction rope (324) is retracted into the connecting seat (331).

6. A center hole depth gauge as claimed in claim 5, characterized in that: The traction assembly comprises an inner rod (321) connected between a locking head (33) and a probe (31) of a rangefinder (2), and an outer tube (322) is sleeved on the outer portion of the inner rod (321), and a linkage plate (323) is provided on a side of the outer tube (322) facing the inner rod (321), and the linkage plate (323) can slide up and down along a slide groove provided on an outer wall of the inner rod (321); The end of the traction rope (324) away from the limiting pin (332) passes around the pulley (325) inside the inner rod (321) and is connected to the top of the linkage plate (323).

7. A center hole depth gauge as claimed in claim 6, characterized in that: A retractable assembly (5) is connected between the inner rod (321) and the outer cylinder (322), and the retractable assembly (5) drives the inner rod (321) and the outer cylinder (322) to move relative to each other; The retractable assembly (5) comprises side plates (53) respectively connected to the inner rod (321) and the outer cylinder (322), and the two side plates (53) are hinged to the same extrusion plate (51) through a connecting rod (52); When the squeezing plate (51) is pressed, the outer cylinder (322) moves toward the bottom of the inner rod (321).

8. A center hole depth gauge as claimed in claim 7, characterized in that: The outer wall of the shell (1) is provided with a guide groove, and the guide groove extends along the length direction of the shell (1); the retractable assembly (5) is located in the guide groove, and the retractable assembly (5) can slide up and down along the guide groove.

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