Anti-theft door cat eye pry-proof cover structure

Abstract

The utility model belongs to the field of door cat eye, specifically disclose security door cat eye anti -prying cover structure, including inside cover and outer cover, be equipped with main protection cylinder on inside cover, be equipped with the vice protection cylinder of screw thread connection with main protection cylinder on outer cover, still be equipped with the anti -drop protection cylinder of coaxial establishment in the outside of main protection cylinder on outer cover, be equipped with interval between anti -drop protection cylinder and main protection cylinder, the accommodating groove of inside and outside two sides of anti -drop protection cylinder is opened to have the hinge joint in accommodating groove and have the needle, be equipped with positioning part and push part on needle, push part and needle hinge joint, hinge joint fulcrum, positioning part, push part, the tip of needle and outer cover of needle are sequentially arranged, the outer circumferential surface of main protection cylinder is equipped with the first taper portion in interval in coaxial, the outer diameter of first taper portion gradually increases in interval to outer cover, the middle part of first taper portion abuts push part, this scheme can realize the difficulty of increasing the thread on vice protection cylinder and main protection cylinder is destroyed, blocks vice protection cylinder after thread is destroyed and is pulled out door hole simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of peepholes, and in particular to an anti-pry cover structure for a peephole on a security door. Background Technology

[0002] Security doors are a type of door that is easy to open and close. They are popular among the public because they are thick, sturdy, and difficult to break into. They are also the first choice for door building materials.

[0003] Existing security doors often have a door opening in the door leaf, and a peephole is installed in the door opening. By utilizing the one-way light transmission of the peephole, users can directly see the people outside the door from inside the house, identify the identity of the person entering, and selectively open the door, thereby reducing the danger to personal safety and property caused by malicious people breaking into the house.

[0004] Currently, peepholes mainly consist of two parts. The first part includes a main protective sleeve for insertion into the doorway, an inner cover, and an inner cover on the main protective sleeve. The second part includes a secondary protective sleeve for insertion into the doorway, an outer cover, and an outer cover on the secondary protective sleeve. The process of installing these two parts onto the door leaf is as follows: the main protective sleeve is inserted into the doorway from the inside of the door leaf, and the secondary protective sleeve is inserted into the doorway from the outside of the door leaf. Inside the doorway, the secondary protective sleeve rotates and connects with the inner circumference of the main protective sleeve via a thread, thus penetrating into the main protective sleeve. As the secondary protective sleeve continues to penetrate deeper into the main protective sleeve, the gap between the outer cover and the inner cover... The gap gradually narrows until the inner cover presses against the inner side of the door leaf and the outer cover presses against the outer side of the door leaf. The inner and outer covers together clamp the opposite sides of the door leaf, fixing the peephole to the door leaf. However, since the outer cover is pressed against the outer side of the door leaf, that is, the outer cover is exposed on the surface of the door leaf, it is relatively difficult to rotate. Therefore, malicious people will pry the outer cover at the gap between the outer cover and the door leaf, pull the secondary cover with external force, and damage the threads on the secondary and main covers, thereby separating the secondary and main covers and detaching them from the door opening, allowing malicious people to peep into the indoor environment through the door opening. Utility Model Content

[0005] The purpose of this utility model is to provide a peephole anti-pry cover structure for anti-theft doors, which increases the difficulty of damaging the threads on the secondary and main protective sleeves, and at the same time prevents the secondary protective sleeve from being pulled out of the doorway after the threads are damaged, thus preventing malicious personnel from peeping into the indoor environment through the doorway.

[0006] The technical solution provided by this utility model is as follows: a peephole anti-pry cover structure for an anti-theft door, comprising an inner cover and an outer cover. The inner cover is provided with a main protective sleeve, and the outer cover is provided with a secondary protective sleeve passing through the main protective sleeve. The secondary protective sleeve is threadedly connected to the main protective sleeve. The outer cover is also provided with an anti-detachment protective sleeve coaxially disposed outside the main protective sleeve. A gap is provided between the anti-detachment protective sleeve and the main protective sleeve. A receiving groove penetrating the inner and outer sides of the anti-detachment protective sleeve is formed on the receiving groove. A needle is attached for swinging to the outside of the anti-detachment protective sleeve. The needle is provided with a positioning part and a pushing part. The pushing part is hinged to the needle. The hinge point of the needle, the positioning part, the pushing part, the tip of the needle and the outer protective cover are arranged in sequence. A first conical part located within the interval is coaxially provided on the outer circumferential surface of the main protective sleeve. The outer diameter of the first conical part gradually increases towards the outer protective cover and is smaller than the inner diameter of the anti-detachment protective sleeve. The middle part of the first conical part abuts against the pushing part.

[0007] In the above-mentioned anti-theft door peephole anti-pry cover structure, a second conical part located within the interval is also coaxially provided on the outer peripheral surface of the main protective tube. The second conical part is located between the first conical part and the outer protective cover, and is connected to the first conical part. The outer diameter of the second conical part gradually increases toward the first conical part, and is smaller than the inner diameter of the anti-detachment protective tube.

[0008] In the above-mentioned anti-theft door peephole anti-pry cover structure, there are at least two of each of the receiving grooves and the needles. The number of the receiving grooves and the needles are the same and correspond one-to-one. The receiving grooves and the needles are arranged in a circumferential array along the anti-detachment protective cylinder. Each needle is provided with a positioning part and a pushing part. The middle part of the first conical part abuts against all the pushing parts.

[0009] In the above-mentioned anti-theft door peephole anti-pry cover structure, a pin is provided between the outer and inner circumferential surfaces of the anti-detachment sleeve. The pin passes through the opposite sides of the anti-detachment sleeve and is interference-fitted with the anti-detachment sleeve. The axis of the pin is perpendicular to the axis of the anti-detachment sleeve.

[0010] In the above-mentioned anti-theft door peephole anti-pry cover structure, the thick end of the first tapered part is in clearance fit with the inner circumferential surface of the anti-detachment protective cylinder.

[0011] In the above-mentioned anti-theft door peephole anti-pry cover structure, a first support part located within the interval is also coaxially provided on the outer peripheral surface of the main protective tube. The first support part is located between the first conical part and the outer protective cover, and is in clearance fit with the inner peripheral surface of the anti-detachment protective tube.

[0012] In the above-mentioned anti-theft door peephole anti-pry cover structure, a second support part is also coaxially provided on the outer peripheral surface of the main protective tube within the interval. The second support part is located on the side of the first conical part away from the outer protective cover and is in clearance fit with the inner peripheral surface of the anti-detachment protective tube.

[0013] In the above-mentioned anti-theft door peephole anti-pry cover structure, a third support part is also coaxially provided on the outer circumferential surface of the main protective tube. The third support part is located between the anti-detachment protective tube and the inner protective cover, and the outer diameter of the third support part is the same as the outer diameter of the anti-detachment protective tube.

[0014] In the above-mentioned anti-theft door peephole pry cover structure, the length of the main protective tube is less than the length of the secondary protective tube.

[0015] In the above-mentioned anti-theft door peephole anti-pry cover structure, a washer is provided in the interval and is coaxially arranged with the secondary protective cylinder. The washer abuts against the inner circumferential surface of the anti-detachment protective cylinder and the outer circumferential surface of the secondary protective cylinder respectively.

[0016] The beneficial effects of this utility model after adopting the above technical solution are as follows:

[0017] This technical solution involves installing an anti-detachment sleeve on the outer cover, located outside the secondary sleeve. This anti-detachment sleeve is pressed against the inner wall of the doorway, fixing the outer cover radially relative to the doorway. The main sleeve on the inner cover, after being inserted into the doorway, is threadedly connected to the secondary sleeve, causing the first conical part on the main sleeve to simultaneously penetrate into the gap between the anti-detachment sleeve and the secondary sleeve. A needle is hinged to the anti-detachment sleeve, allowing it to reciprocate between the inner and outer sides. The needle is hinged within a receiving groove, with the middle of the first conical part abutting against a pushing part on the needle. Since a positioning part is located on the side of the pushing part adjacent to the inner cover, the pushing part, under the pressure of the first conical part, presses against the positioning part. The positioning part prevents the pushing part from swinging towards the inner cover, thus lifting the needle and ensuring the needle tip remains within the opening. When the outer cover is pried open and the secondary protective sleeve is pulled outwards towards the door, the outer cover moves the anti-detachment protective sleeve, causing relative movement between the anti-detachment protective sleeve and the first conical part. The thicker end of the first conical part is located on the side of the outer cover adjacent to the first conical part. As the secondary protective sleeve is continuously pulled, the needle on the anti-detachment protective sleeve gradually approaches the thicker end of the first conical part and is gradually pushed out of the receiving groove by the outer circumferential surface of the first conical part through the pushing part until the tip of the needle protrudes outside the anti-detachment protective sleeve to pierce the inner wall of the doorway. The more the secondary protective sleeve is pulled, the deeper the needle penetrates the inner wall of the doorway, which increases the difficulty of damaging the threads on the secondary and main protective sleeves and also prevents the secondary protective sleeve from being pulled out of the doorway after the threads are damaged, thus preventing malicious personnel from peeping into the indoor environment through the doorway. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the anti-theft door peephole anti-pry cover structure according to Embodiment 1 of this utility model;

[0019] Figure 2 This is the utility model Figure 1 A magnified view of a portion of A;

[0020] Figure 3 This is a partial cross-sectional view of an anti-theft door peephole anti-pry cover structure according to Embodiment 1 of this utility model;

[0021] Figure 4 This is the utility model Figure 3 A magnified view of part B;

[0022] Figure 5 This is a partial cross-sectional assembly diagram of an anti-theft door peephole anti-pry cover structure according to Embodiment 1 of this utility model.

[0023] Reference numerals: 1. Inner cover; 2. Outer cover;

[0024] 11. Main casing; 12. Third support section; 13. Second support section; 14. First conical section; 15. First support section; 16. Second conical section;

[0025] 21. Anti-detachment sleeve; 22. Secondary sleeve; 23. Receiving groove; 24. Needle; 25. Pushing part; 26. Positioning part; 27. Washer. Detailed Implementation

[0026] The technical solution of this utility model will be further described in detail below with reference to specific embodiments, but this does not constitute any limitation on this utility model.

[0027] Example 1:

[0028] like Figure 1-5As shown, a peephole anti-pry cover structure for a security door includes an inner cover 1 and an outer cover 2. The inner cover 1 has a main protective sleeve 11, and the outer cover 2 has a secondary protective sleeve 22 that passes through the main protective sleeve 11. The secondary protective sleeve 22 is threadedly connected to the main protective sleeve 11. The outer cover 2 also has an anti-detachment protective sleeve 21 coaxially located outside the main protective sleeve 11. There is a gap between the anti-detachment protective sleeve 21 and the main protective sleeve 11. The anti-detachment protective sleeve 21 has a receiving groove 23 that penetrates both the inner and outer sides of the anti-detachment protective sleeve 21. A device for... The needle 24 swings to the outside of the anti-detachment sleeve 21. The needle 24 is provided with a positioning part 26 and a pushing part 25. The pushing part 25 is hinged to the needle 24. The hinge fulcrum, positioning part 26, pushing part 25, tip of needle 24 and outer cover 2 are arranged in sequence. The outer circumferential surface of the main sleeve 11 is coaxially provided with a first conical part 14 located in the interval. The outer diameter of the first conical part 14 gradually increases towards the outer cover 2 and is smaller than the inner diameter of the anti-detachment sleeve 21. The middle part of the first conical part 14 abuts against the pushing part 25.

[0029] The specific working principle is as follows: an anti-detachment sleeve 21 is provided on the outer cover 2, located on the outer side of the auxiliary sleeve 22. The anti-detachment sleeve 21 is pressed against the inner wall of the doorway, fixing the outer cover 2 radially relative to the doorway. The main sleeve 11 on the inner cover 1, after being inserted into the doorway, is threadedly connected to the auxiliary sleeve 22, causing the first conical part 14 on the main sleeve 11 to simultaneously penetrate into the gap between the anti-detachment sleeve 21 and the auxiliary sleeve 22. The anti-detachment sleeve 21 is hinged with a... The needle 24, capable of reciprocating between the inner and outer sides of the anti-detachment sleeve 21, is hinged within the receiving groove 23. The middle part of the first conical portion 14 abuts against the pushing portion 25 on the needle 24. Since the positioning portion 26 is located on the side of the pushing portion 25 near the inner cover 1, the pushing portion 25 is pressed against the positioning portion 26 under the pressure of the first conical portion 14. The positioning portion 26 prevents the pushing portion 25 from swinging towards the inner cover 1, thereby lifting the needle 24 by the pushing portion 25. The tip of the piercing needle 24 remains in the receiving groove 23. When the outer cover 2 is pried open and the auxiliary protective sleeve 22 is pulled outward from the door leaf, the outer cover 2 moves the anti-detachment protective sleeve 21. The anti-detachment protective sleeve 21 moves relative to the first conical part 14. The thick end of the first conical part 14 is located on the side of the outer cover 2 adjacent to the first conical part 14. As the auxiliary protective sleeve 22 is continuously pulled, the piercing needle 24 on the anti-detachment protective sleeve 21 gradually approaches the thick end of the first conical part 14 and pushes it. The part 25 is gradually pushed out of the receiving groove 23 by the outer peripheral surface of the first conical part 14 until the tip of the needle 24 is exposed on the outside of the anti-detachment sleeve 21 so as to pierce the inner wall of the doorway. The more the secondary sleeve 22 is pulled, the deeper the needle 24 penetrates the inner wall of the doorway. This increases the difficulty of damaging the threads on the secondary sleeve 22 and the main sleeve 11, and at the same time prevents the secondary sleeve 22 from being pulled out of the doorway after the threads are damaged, thus preventing malicious personnel from peeping into the indoor environment through the doorway.

[0030] In the specific assembly, when the secondary protective sleeve 22 is screwed into the main protective sleeve 11, it drives the anti-detachment protective sleeve 21 to move towards the inner cover 1. The needles 24 on the anti-detachment cover move synchronously with the movement of the anti-detachment protective sleeve 21 and approach the thick end of the first conical part 14. When the needles 24 and the pusher 25 on the needles 24 contact the thick end of the first conical part 14, the thick end of the first conical part 14 pushes the needles 24 to swing around the hinge fulcrum into the receiving groove 23. At the same time, it pushes the pusher 25 to swing towards the outer cover 2 until the tip of the needles 24 and the pusher 25 pass over the thick end of the first conical part 14 and reach the middle of the first conical part 14. This makes it possible for the pusher 25 and the first conical part 14 to reach the assembly position and complete mutual assembly when the secondary protective sleeve 22 is installed in the main protective sleeve 11. This has the advantages of low assembly difficulty and large assembly accuracy tolerance.

[0031] In a further improvement, a second conical portion 16 is coaxially provided on the outer circumferential surface of the main protective sleeve 11, located within the interval. The second conical portion 16 is located between the first conical portion 14 and the outer protective cover 2, and is connected to the first conical portion 14. The outer diameter of the second conical portion 16 gradually increases toward the first conical portion 14, and is smaller than the inner diameter of the anti-detachment protective sleeve 21.

[0032] In this embodiment, by setting a second conical part 16, and utilizing the characteristic that its outer diameter gradually increases towards the first conical part 14, the needle 24 and the pushing part 25 are gradually lifted and swung through the second conical part 16 before contacting the thick end of the first conical part 14. After passing the thick end of the second conical part 16, they reach the thick end of the first conical part 14 and move to the middle of the first conical part 14 as the anti-detachment sleeve 21 approaches the inner cover 1. During the process of the needle 24 moving from the second conical part 16 to the first conical part 14, it is continuously and slowly swaying at a small angle to avoid violent impact, thereby preventing damage to the components. At the same time, it reduces the moving resistance of the anti-detachment sleeve 21 and improves the smoothness of the movement of the anti-detachment sleeve 21.

[0033] Another improvement is that there are at least two receiving grooves 23 and needles 24. The number of receiving grooves 23 and needles 24 are the same and correspond one-to-one. The receiving grooves 23 and needles 24 are arranged in a circumferential array along the anti-detachment sleeve 21. Each needle 24 is provided with a positioning part 26 and a pushing part 25. The middle part of the first conical part 14 abuts against all the pushing parts 25.

[0034] The anti-detachment sleeve 21 is simultaneously pierced into the inner wall of the doorway by the needles 24 at different positions to enhance the pulling resistance of the secondary sleeve 22, thereby improving the anti-pry performance.

[0035] The specific assembly structure of the needle 24 and the anti-detachment sleeve 21 is as follows: a pin is provided between the outer and inner circumferential surfaces of the anti-detachment sleeve 21. The pin passes through the opposite sides of the anti-detachment sleeve 21 and is interference-fitted with the anti-detachment sleeve 21. The axis of the pin is perpendicular to the axis of the anti-detachment sleeve 21.

[0036] In the specific installation method, the needle 24 is first placed in the receiving groove 23, and the opening of the needle 24 is aligned with the opening on the anti-detachment sleeve 21. Then, the pin is driven into the opening on the anti-detachment sleeve 21. The pin passes through the opening on one side of the anti-detachment sleeve 21 of the receiving groove 23, through the opening on the needle 24, and finally through the opening on the opposite side of the receiving groove 23 to exit the anti-detachment sleeve 21.

[0037] Preferably, the thick end of the first tapered portion 14 is clearance-fitted with the inner circumferential surface of the anti-detachment sleeve 21.

[0038] The thick end of the first tapered portion 14 is fitted with the inner circumferential surface of the anti-detachment sleeve 21 through a clearance fit, so that the first tapered portion 14 does not hinder the relative rotation and relative movement of the anti-detachment sleeve 21, and can also support the inner circumferential surface of the anti-detachment sleeve 21, thereby guiding the relative rotation and relative movement of the anti-detachment sleeve 21 to improve the stability and reliability of the connection.

[0039] Another preferred embodiment is that a first support portion 15 is coaxially provided on the outer peripheral surface of the main protective sleeve 11, located within the interval. The first support portion 15 is located between the first conical portion 14 and the outer protective cover 2, and is in clearance fit with the inner peripheral surface of the anti-detachment protective sleeve 21.

[0040] The provision of the first support part 15 increases the number of support points for the main protective tube 11 on the anti-detachment protective tube 21 between the first conical part 14 and the outer protective cover 2. The increase in support points enhances the support effect of the main protective tube 11 on the inner circumferential surface of the anti-detachment protective tube 21, and guides the relative rotation and relative movement of the anti-detachment protective tube 21, thereby improving the stability and reliability of the connection.

[0041] In practical applications, the first support portion 15 can be connected to the thick end of the first tapered portion 14 or spaced apart from the thick end of the first tapered portion 14. This embodiment does not impose too many restrictions on this.

[0042] In a preferred embodiment, the first tapered portion 14, the first support portion 15, and the second tapered portion 16 are connected in sequence, and the outer diameters of the thick ends of the first tapered portion 14, the first support portion 15, and the second tapered portion 16 are the same.

[0043] Preferably, a second support portion 13 is coaxially provided on the outer peripheral surface of the main protective sleeve 11, located within the interval. The second support portion 13 is located on the side of the first conical portion 14 opposite to the outer protective cover 2, and is in clearance fit with the inner peripheral surface of the anti-detachment protective sleeve 21.

[0044] Similarly, the provision of the second support part 13 increases the number of support points of the main protective sleeve 11 on the anti-detachment protective sleeve 21, thereby enhancing the support effect of the main protective sleeve 11 on the inner circumferential surface of the anti-detachment protective sleeve 21, and guiding the relative rotation and relative movement of the anti-detachment protective sleeve 21, thereby improving the stability and reliability of the connection.

[0045] In practical applications, the second support can be connected to the thin end of the first tapered portion 14 or spaced apart from the thin end of the first tapered portion 14. This embodiment does not impose too many restrictions on this.

[0046] Another preferred embodiment is that a third support portion 12 is coaxially provided on the outer circumferential surface of the main protective sleeve 11. The third support portion 12 is located between the anti-detachment protective sleeve 21 and the inner protective cover 1, and the outer diameter of the third support portion 12 is the same as the outer diameter of the anti-detachment protective sleeve 21.

[0047] The second support part 13 increases the number of support points of the main protective sleeve 11 on the inner wall of the doorway between the inner cover 1 and the anti-detachment sleeve 21. By increasing the number of support points, the support effect of the main protective sleeve 11 on the inner wall of the doorway is enhanced, thereby enhancing the stability and reliability of the peephole installed in the doorway.

[0048] In this embodiment, the length of the main casing 11 is less than the length of the secondary casing 22.

[0049] The length settings of the main protective sleeve 11 and the auxiliary protective sleeve 22 are such that when the auxiliary protective sleeve 22 is installed on the end inside the main protective sleeve 11, there is still a gap between the main protective sleeve 11 and the outer cover 2. This prevents the main protective sleeve 11 from pressing against the outer cover 2 and thus hindering the installation of the auxiliary protective sleeve 22 on the end inside the main protective sleeve 11. It also prevents the main protective sleeve 11 from pressing against the outer cover 2 and thus preventing the outer cover 2 from being pressed tightly against the outer side of the door leaf.

[0050] In addition, a washer 27 is provided in the interval, which is coaxially arranged with the auxiliary protective tube 22. The washer 27 abuts against the inner circumferential surface of the anti-detachment protective tube 21 and the outer circumferential surface of the auxiliary protective tube 22 respectively.

[0051] The addition of washer 27 increases the number of support points for the inner circumference of the anti-detachment sleeve 21 by the secondary sleeve 22. By increasing the number of support points, the support effect of the secondary sleeve 22 on the inner circumference of the anti-detachment sleeve 21 is enhanced, thereby reducing the amount of deformation of the anti-detachment sleeve 21 under pressure, and enhancing the stability and reliability of the peephole installed in the doorway.

[0052] In addition, both the inner cover 1 and the outer cover 2 are equipped with convex lenses, and the secondary protective sleeve 22 is equipped with a concave lens.

[0053] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A peephole anti-pry cover structure for a security door, comprising an inner cover and an outer cover, wherein the inner cover is provided with a main protective sleeve, and the outer cover is provided with a secondary protective sleeve passing through the main protective sleeve, the secondary protective sleeve being threadedly connected to the main protective sleeve, characterized in that, The outer cover is also provided with an anti-detachment sleeve coaxially disposed on the outside of the main sleeve. There is a gap between the anti-detachment sleeve and the main sleeve. The anti-detachment sleeve has a receiving groove that penetrates the inner and outer sides of the anti-detachment sleeve. A needle for swinging to the outside of the anti-detachment sleeve is hinged in the receiving groove. The needle has a positioning part and a pushing part. The pushing part is hinged to the needle. The hinge point of the needle, the positioning part, the pushing part, the tip of the needle and the outer cover are arranged in sequence. A first conical part located in the gap is coaxially disposed on the outer circumferential surface of the main sleeve. The outer diameter of the first conical part gradually increases towards the outer cover and is smaller than the inner diameter of the anti-detachment sleeve. The middle part of the first conical part abuts against the pushing part.

2. The anti-pry cover structure for the peephole of a security door according to claim 1, characterized in that, The outer circumferential surface of the main protective sleeve is also coaxially provided with a second conical portion located within the interval. The second conical portion is located between the first conical portion and the outer protective cover, and is connected to the first conical portion. The outer diameter of the second conical portion gradually increases toward the first conical portion, and is smaller than the inner diameter of the anti-detachment protective sleeve.

3. The anti-pry cover structure for the peephole of a security door according to claim 1, characterized in that, At least two of each of the receiving grooves and the needles are provided. The number of receiving grooves and the number of needles are the same and correspond one-to-one. The receiving grooves and the needles are arranged in a circumferential array along the anti-detachment protective sleeve. Each needle is provided with a positioning part and a pushing part. The middle part of the first conical part abuts against all the pushing parts.

4. The anti-pry cover structure for the peephole of a security door according to claim 1, characterized in that, A pin is provided between the outer and inner circumferential surfaces of the anti-detachment sleeve. The pin passes through the opposite sides of the anti-detachment sleeve and is interference-fitted with the anti-detachment sleeve. The axis of the pin is perpendicular to the axis of the anti-detachment sleeve.

5. The anti-pry cover structure for the peephole of a security door according to claim 1, characterized in that, The thicker end of the first tapered portion is in clearance fit with the inner circumferential surface of the anti-detachment sleeve.

6. The anti-pry cover structure for the peephole of a security door according to claim 1, characterized in that, The outer circumferential surface of the main protective sleeve is also coaxially provided with a first support portion located within the interval. The first support portion is located between the first conical portion and the outer protective cover, and is in clearance fit with the inner circumferential surface of the anti-detachment protective sleeve.

7. The anti-pry cover structure for the peephole of a security door according to claim 1, characterized in that, The outer circumferential surface of the main protective sleeve is also coaxially provided with a second support portion located within the interval. The second support portion is located on the side of the first conical portion opposite to the outer protective cover and is in clearance fit with the inner circumferential surface of the anti-detachment protective sleeve.

8. The anti-pry cover structure for the peephole of a security door according to claim 1, characterized in that, A third support portion is also coaxially provided on the outer circumferential surface of the main protective tube. The third support portion is located between the anti-detachment protective tube and the inner protective cover, and the outer diameter of the third support portion is the same as the outer diameter of the anti-detachment protective tube.

9. The anti-pry cover structure for the peephole of a security door according to claim 1, characterized in that, The length of the main casing is less than the length of the secondary casing.

10. The anti-pry cover structure for the peephole of a security door according to claim 1, characterized in that, The interval is provided with a washer coaxially arranged with the secondary protective tube, and the washer abuts against the inner circumferential surface of the anti-detachment protective tube and the outer circumferential surface of the secondary protective tube respectively.

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