A resettable spring positioned plunger

Abstract

This utility model discloses a resettable spring-positioning plunger, including a screw, characterized in that it further includes: a rotating cap on one side of the screw, a compression spring inside the rotating cap, a housing on one side of the compression spring, a pin on one side of the housing, a limit pin on one side of the pin, and a capless screw at the end of the pin. Stable positioning: The compression spring continuously provides axial pressure, ensuring stable extension of the plunger under vibration; Reliable assembly: The limit pin is fixed by the capless screw, preventing it from falling off during assembly and use; The two-stage limit design provides two-stage adjustment, making adjustment more flexible.

Description

Technical Field

[0001] This utility model relates to the field of spring plunger technology, and in particular to a resettable spring positioning plunger. Background Technology

[0002] A spring plunger is a mechanical positioning element with a built-in compression spring. The preload is adjusted by the depth of the threaded insertion. It is suitable for workpiece positioning and clamping in fixtures, molds, and automated machinery. Its front pin is available in spherical, conical (R-type), and flat-head types. The load range is 0.01–50 N, and the operating temperature is -30–140℃. It features precise positioning, dynamic adjustment, and impact resistance. This element is made of highly wear-resistant materials such as stainless steel and is available in standard, short, and press-fit types. It is widely used in machinery manufacturing, medical devices, and the automotive industry. Some products can be customized to reduce costs.

[0003] Chinese patent CN218863025U discloses a reset-type spring positioning plunger, which includes a button, an adapter, a pin, and a threaded housing. The button is located at the upper end of the positioning plunger, the adapter is connected to the threaded housing, and the pin passes through the adapter and the threaded housing. The advantages of this invention are: pressing the button causes the pin to extend and retract; the structural design achieves pop-out and retraction functions under the action of a spring and a ball bearing; the ball bearing's movement trajectory is set and it can move smoothly; the structure is simple, requires little space, and does not require a complex internal structure, greatly saving costs; the press-type automatic reset spring positioning plunger achieves workpiece positioning by compression or extension, and is applicable to positioning under different load conditions, with easy adjustment.

[0004] With the increasing prevalence of automated production, spring plungers, which adjust preload and achieve positioning by controlling the screw-in depth, are used in mechanical manufacturing and equipment, primarily for two-dimensional spatial positioning. However, existing indexing pins used in machining centers are all of a fixed height, and their positioning and retraction can only be achieved through external structures, requiring complex structures that significantly increase production costs. Furthermore, they are not suitable for positioning under different load conditions, and adjustments are quite complex. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a resettable spring-positioning plunger.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A resettable spring-loaded plunger, comprising a screw, characterized in that it further comprises: A rotating cap is provided on one side of the screw, a compression spring is provided inside the rotating cap, a housing is provided on one side of the compression spring, a pin is provided on one side of the housing, a limit pin is provided on one side of the pin, and a capless screw is provided at the end of the pin.

[0007] A further technical solution involves using two-stage limit pins.

[0008] Compared with the prior art, this utility model provides a resettable spring positioning plunger, which has the following beneficial effects: 1. Stable positioning: The compression spring continuously provides axial pressure to ensure that the plunger extends stably under vibration. 2. Reliable assembly: The limit pins are fixed with headless screws to prevent them from falling off during assembly and use; 3. The two-level limit design is set to a two-level adjustment mode, making the adjustment more flexible. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of a resettable spring positioning plunger proposed in this utility model; Figure 2 This is an exploded view of the structure of a resettable spring positioning plunger proposed in this utility model; Figure 3 This is a schematic diagram of a second embodiment of a resettable spring positioning plunger proposed in this utility model; Figure 4 This is a schematic diagram of the original state of a resettable spring positioning plunger proposed in this utility model; Figure 5 This is a schematic diagram of the structure of a resettable spring positioning plunger with the pressing positioning pin extended.

[0010] In the diagram: 1. Screw; 2. Rotary cap; 3. Compression spring; 4. Housing; 5. Pin; 6. Limit pin; 7. Capless screw; 8. Two-stage limit pin. Detailed Implementation

[0011] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of the present utility model.

[0012] Example 1: Refer to Figure 1 - Figure 2 A resettable spring-loaded plunger includes a screw 1, and further includes: A rotating cap 2 is provided on one side of the screw 1. A compression spring 3 is provided inside the rotating cap 2. A housing 4 is provided on one side of the compression spring 3. A pin 5 is provided on one side of the housing 4, and the pin 5 is inserted into the interior of the housing 4 from the bottom. A limiting pin 6 is provided on one side of the pin 5, which is used to limit the axial movement of the pin 5 in the guide groove of the housing 4. A capless screw 7 is provided at the end of the pin 5 for connecting and fixing the pin 5.

[0013] In the actual design process of this utility model, to avoid the following defects existing in the prior art: "The indexing pins currently used in processing machines are all of a specified height, and the indexing pins can only be positioned and retracted through an external structure, which requires a complex structure to achieve, greatly increasing production costs; and they cannot be applied to positioning under different load conditions, and the adjustment is relatively complicated."

[0014] like Figure 4 and Figure 5 As shown, this case demonstrates the "original state (pin retracted)" and the "positioning state (pin extended)", reflecting the positional stability under spring pressure.

[0015] like Figure 2As shown, insert the limiting pin 6 into the radial through hole of the pin 5, and screw the end into the capless screw 7 for fixation (to prevent the pin from falling off). Fit the compression spring 3 into the central receiving cavity of the outer shell 4 (one end of the spring abuts against the inner wall step of the outer shell 4). Insert the assembled limiting pin 5 from the lower end of the outer shell, so that the other end of the spring abuts against the annular step of the pin. At this time, the limiting pin 6 is embedded in the axial guide groove of the inner wall of the outer shell 4 (restricting the rotation of the pin 5, allowing only axial movement). Align the rotating cap 2 with the upper end of the outer shell 4 and connect and fix it with the screw 1. After assembly, press and test the compression to ensure the spring operates smoothly; if there is no abnormal noise, it is ready. When the extension limit is working, the direction can be freely adjusted by rotation within the extension length.

[0016] Example 2: Refer to Figure 1 and Figure 3 - Figure 5 A resettable spring-positioning plunger, wherein the limiting pin 6 uses two-stage limiting pins 8.

[0017] like Figure 1 It features a two-stage limit design: a two-section limit groove design, and... Figure 4 and Figure 5 Compared to adding a section, the adjustment is more flexible. That is, when pin 5 is in the extension limit position, it can be rotated freely within the extension length to adjust the direction.

[0018] like Figure 3 Take pin 5 (plunger rod body) and insert two-stage limiting pins 8 into its radial through hole; screw in the headless screw 7 through the threaded hole on the side of pin 5 until the end of the screw presses against the two-stage limiting pins 8, completing the assembly of the sub-assembly (anti-loosening structure) of "pin 5 - two-stage limiting pins 8 - headless screw 7". Insert the assembled pin 5 into the opening at the lower end of the outer casing 4, so that the annular step of pin 5 contacts the other end of the compression spring 3; Rotate pin 5 to fine-tune the angle, ensuring that both ends of the two-stage limiting pins 8 are accurately embedded in the axial guide grooves on the inner wall of the outer casing 4 (at this time, pin 5 can only move axially along the groove and cannot rotate). Take the rotating cap 2 (with an anti-slip textured adjustment head) and press it into the rotating cap 2 with an interference fit to complete the assembly of the plunger of this scheme.

[0019] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A resettable spring-loaded positioning plunger, comprising a screw (1), characterized in that, Also includes: A rotating cap (2) is provided on one side of the screw (1), a compression spring (3) is provided on the inner side of the rotating cap (2), a housing (4) is provided on one side of the compression spring (3), a pin (5) is provided on one side of the housing (4), a limit pin (6) is provided on one side of the pin (5), and a capless screw (7) is provided at the end of the pin (5).

2. The resettable spring-positioning plunger according to claim 1, characterized in that, The limiting pin (6) uses a two-stage limiting pin (8).

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