Jig for testing mold clamping force of upper mold and lower mold of contact lens

Abstract

The utility model relates to the technical field of jigs, in particular to a jig for testing the mold clamping force of an upper mold and a lower mold of a contact lens, which is used for testing the mold clamping force between the upper mold and the lower mold of the contact lens after mold clamping, and comprises a lower jig fixed on a fixed seat and an upper jig module fixed on a tension meter clamp of a tension tester, the lower jig is provided with a clamping part for clamping the contact lens upper die, and the upper jig module is provided with an upward pulling part for pulling the contact lens lower die upwards; the clamping part is arranged at the top of the lower jig and structurally comprises a lower left clamping plate and a lower right clamping plate which are symmetrically arranged left and right and formed by T-shaped grooves which are upside down; the upper pulling part is arranged at the bottom of the upper jig module and structurally comprises an upper left clamping plate and an upper right clamping plate which are formed by T-shaped grooves and are in bilateral symmetry; the utility model has the advantages of simple structure and strong practicability.

Description

Technical Field

[0001] This utility model relates to the field of fixture technology, and in particular to a fixture for testing the clamping force of the upper and lower molds of a contact lens. Background Technology

[0002] Tensile testing machines can be used for various types of mechanical tests, including tension, compression, bending, shear, and peeling. Modern tensile testing machines are typically equipped with automated control systems, enabling automated control and data processing during the testing process, thus improving testing efficiency and accuracy.

[0003] The main material of contact lenses is lens monomer, which is usually liquid. After purification, it is solidified and polymerized by ultraviolet light or heat to form a cylindrical blank called a clasp. The liquid lens monomer is then pressurized and solidified using metal molds, which is highly efficient and suitable for large-scale production, resulting in soft and comfortable lenses.

[0004] When the upper and lower molds of a contact lens are joined, they are in an interference fit. There are requirements for the magnitude of the clamping force between the upper and lower molds after the interference fit. In the prior art, there is no special fixture for testing the clamping force between the upper and lower molds of a contact lens. This paper provides a fixture for testing the clamping force between the upper and lower molds of a contact lens to solve the problems existing in the prior art. Utility Model Content

[0005] The purpose of this invention is to provide a fixture for testing the clamping force between the upper and lower molds of a contact lens, so as to solve the problem that there is no special fixture for testing the clamping force between the upper and lower molds of a contact lens in the prior art.

[0006] The technical solution of this utility model is: a fixture for testing the clamping force between the upper and lower molds of a contact lens, used to test the clamping force between the molded upper and lower molds of a contact lens, including a lower fixture fixed on a fixed base and an upper fixture module fixed to the tensile gauge clamp of a tensile testing instrument, wherein the lower fixture is provided with a locking part for locking the upper mold of the contact lens, and the upper fixture module is provided with an upward pulling part for pulling the lower mold of the contact lens upward.

[0007] Preferably, the locking part is located at the top of the lower fixture, and its structure is a left and right symmetrical lower locking plate and a right locking plate formed by an upside-down T-shaped groove;

[0008] The upper pull part is located at the bottom of the upper fixture module, and its structure consists of an upper left clamping plate and an upper right clamping plate formed by a T-shaped groove.

[0009] Preferably, the upper contact lens mold includes a first annular portion, a second annular portion, a third annular portion, and a spherical arc surface connected sequentially from the outside to the inside; the lower contact lens mold includes a first annular portion, a second annular portion, and a spherical arc surface connected sequentially from the outside to the inside.

[0010] When the upper and lower contact lens molds are joined, the distance between the first annular portion of the upper mold and the first annular portion of the lower mold is greater than the sum of the thicknesses of the upper left and lower left plates.

[0011] Preferably, when the upper and lower contact lens molds are assembled and placed upside down on the fixture, the lower fixture holds the upper contact lens mold by using the lower left and lower right clamping plates together to hold the first annular part of the upper mold; the upper fixture module pulls the first annular part of the lower mold of the lower contact lens mold by using the upper left and upper right clamping plates.

[0012] Preferably, the height of the groove in the horizontal portion of the T-shaped groove forming the upper left and upper right card plates is greater than the height of the lower contact lens mold.

[0013] Preferably, the upper fixture module includes a first upper fixture and a second upper fixture. The first upper fixture is provided with a hook groove, and the second upper fixture is provided with a hook portion. The hook portion can slide relative to the hook groove and be hooked by the hook groove.

[0014] Preferably, the hook groove is T-shaped, including a horizontal hook groove and a vertical hook groove; the hook part is T-shaped, including a horizontal hook part and a vertical hook part;

[0015] The hook portion fits into the hook groove, and the height of the horizontal hook groove is greater than the height of the horizontal hook portion, while the width of the vertical hook groove is greater than the width of the vertical hook portion.

[0016] Compared with the prior art, the advantages of this utility model are:

[0017] (1) A fixture for testing the clamping force between the upper and lower molds of a contact lens in this utility model includes a lower fixture fixed on a fixed base and an upper fixture module fixed on a tension gauge clamp of a tension tester. The lower fixture is provided with a locking part for locking the upper mold of the contact lens, and the upper fixture module is provided with an upward pulling part for pulling the lower mold of the contact lens upward. This utility model has a simple structure and strong practicality, and solves the problem that there is no special fixture for testing the clamping force between the upper and lower molds of a contact lens in the prior art.

[0018] (2) In this utility model, the hook part fits into the hook groove, and the height E of the horizontal hook groove is greater than the height F of the horizontal hook part, and the width J of the vertical hook groove is greater than the width K of the vertical hook part; this ensures that the hook part can slide relatively in the hook groove without touching the hook groove. The advantage of setting up a buffer is that before measuring the reasonable force of the upper and lower contact lens molds, the first upper fixture rises first. At this time, the second upper fixture does not move. When the first upper fixture continues to rise, it touches the second upper fixture, and the second upper fixture can immediately pull the upper and lower contact lens molds apart, thus improving the accuracy of the test. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 This is a schematic diagram of a fixture structure for testing the clamping force of the upper and lower molds of a contact lens, as described in this utility model.

[0021] Figure 2 Figure 1 Front view;

[0022] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0023] Figure 4 This is a schematic diagram of the fixture's state structure when measuring the clamping force of the upper and lower contact lens molds as described in this utility model.

[0024] The components are: 1. Upper contact lens mold, 2. First annular part of the upper mold, 3. Second annular part of the upper mold, 4. Third annular part of the upper mold, 5. Spherical arc surface of the upper mold, 6. Lower contact lens mold, 7. First annular part of the lower mold, 8. Second annular part of the lower mold, 9. Spherical arc surface of the lower mold, 10. Lower fixture, 11. Lower left retaining plate, 12. Lower right retaining plate, 13. Upper left retaining plate, 14. Upper right retaining plate, 15. First upper fixture, 16. Horizontal hook groove, 17. Vertical hook groove, 18. Second upper fixture, 19. Horizontal hook part, 20. Vertical hook part. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to specific embodiments:

[0026] In the description of the utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the 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. Therefore, they should not be construed as limitations on the utility model.

[0027] like Figure 1 , Figure 2 As shown, a fixture for testing the clamping force between an upper mold 1 and a lower mold of a contact lens is used to test the clamping force between the molded upper mold 1 and the lower mold 6 of a contact lens. It includes a lower fixture 10 fixed on a fixed base and an upper fixture module fixed to the tension gauge clamp of a tension tester. The lower fixture 10 is provided with a locking part for locking the upper mold 1 of the contact lens, and the upper fixture module is provided with an upward pulling part for pulling the lower mold 6 of the contact lens upward.

[0028] like Figure 3 As shown, the locking part is located at the top of the lower fixture 10, and its structure consists of a lower left locking plate 11 and a lower right locking plate 12 formed by an inverted T-shaped groove; the upper pulling part is located at the bottom of the upper fixture module, and its structure consists of an upper left locking plate 13 and an upper right locking plate 14 formed by a T-shaped groove.

[0029] The upper contact lens mold 1 includes an upper mold first annular part 2, an upper mold second annular part 3, an upper mold third annular part 4, and an upper mold spherical arc surface 5 connected sequentially from the outside to the inside. The lower contact lens mold 6 includes a lower mold first annular part 7, a lower mold second annular part 8, and a lower mold spherical arc surface 9 connected sequentially from the outside to the inside.

[0030] When the upper contact lens mold 1 and the lower contact lens mold 6 are joined, the distance H between the first annular portion 2 of the upper mold 1 and the first annular portion 7 of the lower mold 6 is greater than the sum of the thicknesses L of the upper left retaining plate 13 and the lower left retaining plate 11 (e.g., ...). Figure 3As shown), preferably, the distance between the first annular portion 2 of the upper mold of the upper contact lens mold 1 and the first annular portion 7 of the lower mold of the lower contact lens mold 6 is slightly greater than the sum of the thicknesses of the upper left clamping plate 13 and the lower left clamping plate 11. This ensures that when the molded upper contact lens mold 1 and lower contact lens mold 6 are placed on the contacting lower fixture 10 and the second upper fixture 18 to prepare for the mold-closing force test, the lower left clamping plate 11, the lower right clamping plate 12, the upper left clamping plate 13, and the upper right clamping plate 14 do not apply any mold-opening force to the upper contact lens mold 1 and the lower contact lens mold 6, so as not to affect the measurement of the mold-closing force; and it also ensures that the upper contact lens mold 1 and the lower contact lens mold 6 can be pulled apart as soon as the second upper fixture 18 rises.

[0031] like Figure 2 , Figure 3 As shown, when the upper contact lens mold 1 and the lower contact lens mold 6 are assembled and placed upside down on the fixture, the lower fixture 10 holds the upper contact lens mold 1 by using the lower left clamping plate 11 and the lower right clamping plate 12 together to hold the upper contact lens mold 1 by holding the first annular part 2 of the upper mold; the upper fixture module pulls the lower annular part 7 of the lower contact lens mold 6 upward by using the upper left clamping plate 13 and the upper right clamping plate 14.

[0032] like Figure 3 As shown, the height M of the groove in the horizontal part of the T-shaped groove forming the upper left retaining plate 13 and the upper right retaining plate 14 is greater than the height N of the lower contact lens mold 6, thus forming a groove in the horizontal part of the T-shaped groove forming the upper left retaining plate 13 and the upper right retaining plate 14 that can accommodate the lower contact lens mold 6. Figure 2 , Figure 4 As shown, the upper fixture module includes a first upper fixture 15 and a second upper fixture 18. The first upper fixture 15 is provided with a hook groove, and the second upper fixture 18 is provided with a hook portion. The hook portion can slide relative to the hook groove and be hooked by the hook groove. The hook groove is T-shaped and includes a horizontal hook groove 16 and a vertical hook groove 17; the hook portion is T-shaped and includes a horizontal hook portion 19 and a vertical hook portion 20; the hook portion fits into the hook groove, and the height E of the horizontal hook groove is greater than the height F of the horizontal hook portion 19, and the width J of the vertical hook groove 17 is greater than the width K of the vertical hook portion 20 (e.g., ...). Figure 2 (As shown); This ensures that the hook can slide relative to the hook groove without touching it. The advantage of this buffer is that before measuring the reasonable force of the upper contact lens mold 1 and the lower contact lens mold 6, the first upper fixture 15 rises first. At this time, the second upper fixture 18 remains stationary. When the first upper fixture 15 continues to rise and touches the second upper fixture 18, the second upper fixture 18 can immediately pull the upper contact lens mold 1 and the lower contact lens mold 6 apart, thus improving the accuracy of the test.

[0033] The working principle of this utility model is as follows: In the initial state, with Figure 2Taking the orientation as an example, from front to back, the hook of the second upper fixture 18 is inserted into the hook groove of the first upper fixture 15. The top of the first upper fixture 15 is fixed on the tensile gauge clamp of the tensile tester. The second upper fixture 18 is placed on the lower fixture 10. At this time, the first upper fixture 15 and the second upper fixture 18 do not contact each other. After the molded upper contact lens mold 1 and lower contact lens mold 6 are inverted, the lower left clamping plate 11, lower right clamping plate 12, upper left clamping plate 13, and upper right clamping plate 14 are inserted and placed on the lower fixture 10. Specifically, the lower left clamping plate 11 and upper left clamping plate 13 are inserted between the first annular part 2 of the upper mold and the first annular part 2 of the upper mold, and the lower right clamping plate 12 and upper right clamping plate 14 are inserted between the first annular part 2 of the upper mold and the first annular part 2 of the upper mold. The entire initial state structure is as follows. Figure 2 As shown;

[0034] The test begins. The drive mechanism of the tensile testing machine raises the first upper fixture 15, while the second upper fixture 18 remains stationary. As the first upper fixture 15 continues to rise and encounters the second upper fixture 18, it pulls the second upper fixture 18 upward, simultaneously separating the upper contact lens mold 1 and the lower contact lens mold 6. The current state is as follows: Figure 4 As shown, this allows the display terminal to read the clamping force of the upper contact lens mold 1 and the lower contact lens mold 6, check whether the clamping force is qualified, and then remove the upper contact lens mold 1 and the lower contact lens mold 6 to return to the initial state.

[0035] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and therefore, all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within this utility model.

Claims

1. A fixture for testing the clamping force between an upper and lower mold of a contact lens, used to test the clamping force between the molded upper and lower molds of a contact lens, characterized in that: The device includes a lower fixture fixed on a fixed base and an upper fixture module fixed to a tension gauge clamp of a tension tester. The lower fixture is provided with a locking part for locking the upper mold of the contact lens, and the upper fixture module is provided with an upper pulling part for pulling the lower mold of the contact lens upward.

2. The fixture for testing the clamping force of the upper and lower molds of a contact lens according to claim 1, characterized in that: The locking part is located on the top of the lower fixture, and its structure consists of a lower left locking plate and a lower right locking plate formed by an inverted T-shaped groove. The upper pull part is located at the bottom of the upper fixture module, and its structure consists of an upper left clamping plate and an upper right clamping plate formed by a T-shaped groove.

3. The fixture for testing the clamping force of the upper and lower molds of a contact lens according to claim 2, characterized in that: The upper contact lens mold includes a first annular portion, a second annular portion, a third annular portion, and a spherical arc surface connected sequentially from the outside to the inside; the lower contact lens mold includes a first annular portion, a second annular portion, and a spherical arc surface connected sequentially from the outside to the inside. When the upper and lower contact lens molds are joined, the distance between the first annular portion of the upper mold and the first annular portion of the lower mold is greater than the sum of the thicknesses of the upper left and lower left plates.

4. A fixture for testing the clamping force of the upper and lower molds of a contact lens according to claim 3, characterized in that: When the upper and lower contact lens molds are assembled and placed upside down on the fixture, the lower fixture holds the upper contact lens mold in place by using the lower left and lower right clamping plates together; the upper fixture module pulls the lower contact lens mold's first annular portion by using the upper left and upper right clamping plates.

5. A fixture for testing the clamping force of the upper and lower molds of a contact lens according to claim 2, characterized in that: The height of the horizontal portion of the T-shaped groove forming the upper left and upper right card plates is greater than the height of the lower contact lens mold.

6. A fixture for testing the clamping force of the upper and lower molds of a contact lens according to claim 1, characterized in that: The upper fixture module includes a first upper fixture and a second upper fixture. The first upper fixture is provided with a hook groove, and the second upper fixture is provided with a hook. The hook can slide relative to the hook groove and be hooked by the hook groove.

7. A fixture for testing the clamping force of the upper and lower molds of a contact lens according to claim 6, characterized in that: The hook groove is T-shaped, including a horizontal hook groove and a vertical hook groove; the hook part is T-shaped, including a horizontal hook part and a vertical hook part; The hook portion fits into the hook groove, and the height of the horizontal hook groove is greater than the height of the horizontal hook portion, while the width of the vertical hook groove is greater than the width of the vertical hook portion.

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