Medical scalpel grinding and edging equipment

Abstract

The utility model relates to the technical field of scalpel machining, in particular to medical scalpel grinding and edging equipment which comprises a shell, a plurality of grinding mechanisms are arranged in the shell, each grinding mechanism comprises a first-stage moving assembly, a feeding and discharging mechanism is further arranged in the shell, and the first-stage moving assembly comprises a first-stage moving assembly and a second-stage moving assembly. A grinding station mechanism is further arranged on one side of the feeding and discharging mechanism. The grinding mechanism, the grinding station mechanism and the feeding and discharging mechanism are arranged in the shell, a scalpel to be ground and edged can be rapidly moved to the grinding station mechanism, then the scalpel is fixed, and in the grinding process, the scalpel can be ground and edged through the grinding mechanism and the grinding station mechanism. The positions of the scalpels and the grinding machine can be rapidly adjusted, so that grinding and edging machining of the scalpels is completed, operation is simpler and more convenient, grinding and edging machining can be conducted on multiple sets of scalpels at the same time, and the machining efficiency can be further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to surgical knife processing technical field, concretely relates to a medical surgical knife grinding and opening blade equipment. BACKGROUND

[0002] Medical surgical knife grinding and opening blade refers to the careful grinding of the blade of a surgical knife to restore its sharpness or improve its cutting performance, which is usually carried out by using special grinding tools such as grinding wheels, sandpaper or grinding machines, so as to ensure that the blade remains accurate and sharp to adapt to the delicate operation in medical operations. At present, when grinding and opening the blade of a surgical knife, it is mostly done manually by positioning and fixing the surgical knife and repeatedly adjusting the position of the grinding tool and the surgical knife to ensure the overall grinding efficiency of the surgical knife, but the overall operation is inconvenient, which will also affect the actual grinding and opening blade processing efficiency of the surgical knife.

[0003] In view of this, we propose a medical surgical knife grinding and opening blade equipment. UTILITY MODEL CONTENT

[0004] In view of the above shortcomings of the prior art, the utility model provides a medical surgical knife grinding and opening blade equipment, which can effectively solve the problem of the need for manual repeated adjustment and fixing of the position of the surgical knife and the grinding tool in the prior art, which is inconvenient to operate and affects the processing efficiency.

[0005] To achieve the above purpose, the utility model realizes the following technical scheme:

[0006] The utility model provides a medical surgical knife grinding and opening blade equipment, which comprises a shell, a plurality of grinding mechanisms are arranged in the shell, and the plurality of grinding mechanisms are arranged in a ring array;

[0007] Among them, the plurality of grinding mechanisms each comprise a first moving assembly, the plurality of first moving assemblies each comprise a base fixedly installed at the bottom of the inner cavity of the shell, a first motor is fixedly installed on one side of the base, the first motor is fixedly installed with a synchronous wheel transmission part through an output shaft, a lead screw is also fixedly installed on one side of the synchronous wheel transmission part, the end of the lead screw away from the synchronous wheel transmission part is rotatably installed on the inner cavity side wall of the base, a threaded sleeve is threadedly connected to the surface of the lead screw, two groups of sliding rails are also fixedly installed on the top of the base, and two groups of sliding blocks are slidingly installed on the surfaces of the two groups of sliding rails;

[0008] The inner part of the shell is also provided with a feeding and discharging mechanism, and the feeding and discharging mechanism is also provided with a grinding station mechanism on one side, and the grinding station mechanism is located at the center position of the plurality of grinding mechanisms.

[0009] Further, each of the plurality of grinding mechanisms further comprises a second moving assembly and a third moving assembly, and the second moving assembly and the third moving assembly have the same structure as the first moving assembly.

[0010] Further, the bottom of the second moving assembly is fixedly installed on the top of the threaded sleeve, and the bottom of the second moving assembly is also fixedly installed on the top of the two groups of sliding blocks.

[0011] The third moving assembly is fixedly installed on the top of the second moving assembly, and one side of each of the plurality of third moving assemblies is slidingly installed with a grinding machine body.

[0012] Further, the feeding and discharging mechanism comprises a first sliding assembly, the bottom of the first sliding assembly is fixedly installed on the bottom of the inner cavity of the shell, and the top of the first sliding assembly is slidingly installed with a placing rack.

[0013] Further, the feeding and discharging mechanism further comprises a second sliding assembly arranged on one side of the first sliding assembly, the bottom of the second sliding assembly is fixedly installed on the bottom of the inner cavity of the shell, and the side of the second sliding assembly close to the placing rack is slidingly installed with a fixing rack.

[0014] Further, the side of the fixing rack away from the second sliding assembly is fixedly installed with two groups of third sliding assemblies, and the side of each of the two groups of third sliding assemblies away from the fixing rack is slidingly installed with a first pneumatic grabbing assembly.

[0015] Further, the side of the fixing rack away from the second sliding assembly is also fixedly installed with a fourth sliding assembly, and the side of the fourth sliding assembly away from the fixing rack is slidingly installed with a second pneumatic grabbing assembly.

[0016] Further, the grinding station mechanism comprises a grinding table, and the inner cavity side wall of the grinding table is fixedly installed with a plurality of fixed assemblies arranged in a ring array.

[0017] Each of the plurality of fixed assemblies comprises an inclined seat, the top of the inclined seat is fixedly installed with a second motor, the second motor is fixedly installed with a fixed rod through an output shaft, the surface of the fixed rod is fixedly installed with a tool holder support, one side of the tool holder support is provided with a cutting edge fixing seat, the inner cavity side wall of the cutting edge fixing seat is fixedly installed on the surface of the fixed rod, and the end of the fixed rod away from the second motor is rotatably installed on the inner cavity side wall of the inclined seat.

[0018] Further, the top of the grinding table is also fixedly installed with a plurality of positioning sensors corresponding to the fixed assemblies.

[0019] The inner cavity side wall of the grinding table is also fixedly installed with a rotating shaft, the bottom of the rotating shaft is fixedly installed with a driving assembly, and the bottom of the driving assembly is fixedly installed on the bottom of the inner cavity of the shell.

[0020] The technical scheme provided by the utility model has the following beneficial effects compared with the known prior art:

[0021] The utility model discloses a grinding mechanism and a grinding station mechanism and the feeding and discharging mechanism are arranged in the shell, can quickly move the scalpel to be ground to the grinding station mechanism, then fixes the scalpel, and in the grinding process, through the grinding mechanism and the grinding station mechanism, the position of the scalpel and the grinding machine can be adjusted quickly, thereby completing the grinding edge processing of the scalpel, and the operation is more convenient, and a plurality of scalpel groups can be ground simultaneously, and the processing efficiency can be further improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0023] Figure 1 It is the shell cross section structure schematic drawing of the utility model;

[0024] Figure 2 It is the shell internal component structure schematic drawing of the utility model;

[0025] Figure 3 It is the grinding mechanism schematic drawing of the utility model;

[0026] Figure 4 It is the first level moving component structure schematic drawing of the utility model;

[0027] Figure 5 It is the feeding and discharging mechanism schematic drawing of the utility model;

[0028] Figure 6 It is the grinding station mechanism upper side partial structure schematic drawing of the utility model;

[0029] Figure 7 It is the grinding station structure lower side partial structure schematic drawing of the utility model;

[0030] Figure 8 It is the fixed component structure schematic drawing of the utility model.

[0031] The numbers in the drawing respectively represent: 1, shell;

[0032] 2, grinding mechanism; 201, first moving assembly; 2011, base; 2012, first motor; 2013, synchronous wheel transmission part; 2014, screw rod; 2015, threaded sleeve; 2016, slide rail; 2017, sliding block; 202, second moving assembly; 203, third moving assembly; 204, grinding machine body;

[0033] 3, feeding and discharging mechanism; 301, first sliding assembly; 302, placing rack; 303, second sliding assembly; 304, fixed frame; 305, third sliding assembly; 306, first pneumatic grabbing assembly; 307, fourth sliding assembly; 308, second pneumatic grabbing assembly;

[0034] 4, grinding station mechanism; 401, grinding table; 402, fixed assembly; 4021, inclined seat; 4022, second motor; 4023, fixed rod; 4024, tool handle support seat; 4025, blade fixing seat; 403, positioning sensor; 404, rotating shaft; 405, driving assembly. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] The present application will be further described below in combination with the embodiments.

[0037] The utility model provides a kind of medical scalpel grinding and opening blade equipment, including shell 1, the inside of shell 1 is provided with multiple sets of grinding mechanism 2, and multiple sets of grinding mechanism 2 are annular array distribution, wherein, multiple sets of grinding mechanism 2 all include a first moving assembly 201, multiple sets of first moving assembly 201 all include the base 2011 fixedly installed in the inner cavity bottom of shell 1, the side of base 2011 is fixedly installed with first motor 2012, first motor 2012 is fixedly installed with synchronous wheel transmission component 2013 by output shaft, the side of synchronous wheel transmission component 2013 is also fixedly installed with screw rod 2014, the end of screw rod 2014 away from synchronous wheel transmission component 2013 is rotatably installed in the inner cavity side wall of base 2011, the surface of screw rod 2014 is threadedly connected with threaded sleeve 2015, two sets of slide rails 2016 are also fixedly installed on the top of base 2011, and two sets of slide rails 2016 are all slidingly installed with two sets of sliding blocks 2017, the inside of shell 1 is also equipped with feeding and discharging mechanism 3, and one side of feeding and discharging mechanism 3 is also provided with grinding station mechanism 4, and grinding station mechanism 4 is located at the central position of multiple sets of grinding mechanism 2;

[0038] Specifically, multiple sets of grinding mechanism 2 all also include secondary moving assembly 202 and tertiary moving assembly 203, and secondary moving assembly 202 and tertiary moving assembly 203 are consistent with the structure of first moving assembly 201, secondary moving assembly 202 is fixedly installed on the top of threaded sleeve 2015, and the bottom of secondary moving assembly 202 is also fixedly installed on the top of two sets of sliding blocks 2017, wherein, tertiary moving assembly 203 is fixedly installed on the top of secondary moving assembly 202, and the side of multiple sets of tertiary moving assembly 203 is slidingly installed with grinding machine body 204;

[0039] Specifically, by feeding and discharging mechanism 3 provided in the inside of shell 1, the scalpel to be ground can be fed, and the scalpel is moved to grinding station mechanism 4, then the components on grinding station mechanism 4 are used to support and fix the scalpel, after fixing, the position of grinding machine body 204 is adjusted by first moving assembly 201, secondary moving assembly 202 and tertiary moving assembly 203 on grinding mechanism 2, to ensure accurate grinding and opening blade processing of the scalpel;

[0040] Specifically, the first motor 2012 on the base 2011 is driven to drive the synchronous wheel transmission component 2013 to rotate the lead screw 2014, the slide rail 2016 and the slide block 2017 on the slide rail 2016 are used for limiting and guiding, the threaded sleeve 2015 is used to drive the second moving assembly 202 to move axially when the lead screw 2014 rotates, the second moving assembly 202 is used to drive the third moving assembly 203 at the top to move, and the third moving assembly 203 is used to drive the grinder body 204 to move, so as to adjust the grinder body 204 at different positions and directions.

[0041] Further, the feeding and discharging mechanism 3 comprises a first sliding assembly 301, the bottom of the first sliding assembly 301 is fixedly installed on the bottom of the inner cavity of the shell 1, and the top of the first sliding assembly 301 is slidably installed with a placing rack 302, the feeding and discharging mechanism 3 further comprises a second sliding assembly 303 arranged on one side of the first sliding assembly 301, the bottom of the second sliding assembly 303 is fixedly installed on the bottom of the inner cavity of the shell 1, and the side close to the placing rack 302 of the second sliding assembly 303 is slidably installed with a fixing rack 304, the side away from the second sliding assembly 303 of the fixing rack 304 is fixedly installed with two groups of third sliding assemblies 305, the side away from the fixing rack 304 of the two groups of third sliding assemblies 305 is slidably installed with a first pneumatic grabbing assembly 306, and the side away from the second sliding assembly 303 of the fixing rack 304 is further fixedly installed with a fourth sliding assembly 307, and the side away from the fixing rack 304 of the fourth sliding assembly 307 is slidably installed with a second pneumatic grabbing assembly 308.

[0042] Specifically, first, the surgical knife to be ground is placed on the placing rack 302 of the first sliding assembly 301, the first sliding assembly 301 drives the placing rack 302 and the surgical knife on the placing rack 302 to move axially, the surgical knife is sent to the area of the second sliding assembly 303, then the first pneumatic grabbing assembly 306 on the two groups of third sliding assemblies 305 clamps the surgical knife, the two groups of third sliding assemblies 305, the second sliding assembly 303 and the fixing rack 304 move the clamped surgical knife to the grinding station mechanism 4, and the grinding station mechanism 4 positions and fixes the surgical knife, so that the grinder body 204 on the grinding mechanism 2 and related assemblies grind and sharpen the surgical knife.

[0043] Further, when the surgical knife grinding process is completed, the second pneumatic grabbing assembly 308 on the fourth sliding assembly 307 can be used to clamp the processed surgical knife. The second pneumatic grabbing assembly 308 and the surgical knife clamped by the second pneumatic grabbing assembly 308 can be moved to the position of the placement rack 302 through the fourth sliding assembly 307 and the second sliding assembly 303. Then, the processed surgical knife can be placed on the placement rack 302. The first sliding assembly 301 can be used to move the processed surgical knife to the designated area, so that the staff can safely take the processed surgical knife.

[0044] Further, the grinding station mechanism 4 comprises a grinding table 401. The inner cavity side wall of the grinding table 401 is fixedly installed with a plurality of groups of fixed assemblies 402 arranged in a ring array. Each group of fixed assemblies 402 comprises an inclined seat 4021. The top of the inclined seat 4021 is fixedly installed with a second motor 4022. The second motor 4022 is fixedly installed with a fixed rod 4023 through an output shaft. The surface of the fixed rod 4023 is fixedly installed with a handle support seat 4024. One side of the handle support seat 4024 is provided with a blade fixing seat 4025. The inner cavity side wall of the blade fixing seat 4025 is fixedly installed on the surface of the fixed rod 4023. The end of the fixed rod 4023 away from the second motor 4022 is rotatably installed on the inner cavity side wall of the inclined seat 4021. The top of the grinding table 401 is further fixedly installed with a plurality of groups of positioning sensors 403 corresponding to the fixed assemblies 402. The inner cavity side wall of the grinding table 401 is further fixedly installed with a rotating shaft 404. The bottom of the rotating shaft 404 is fixedly installed with a driving assembly 405. The bottom of the driving assembly 405 is fixedly installed on the inner cavity bottom of the shell 1.

[0045] Specifically, when the surgical knife moves to the grinding station mechanism 4, the handle of the surgical knife can be placed on the handle support seat 4024 on the inclined seat 4021, and then the blade part is placed on the blade fixing seat 4025. The blade can be fixed by using the pneumatic structure on the blade fixing seat 4025. After the fixing is completed, the handle support seat 4024 and the blade fixing seat 4025 can be driven to rotate by the second motor 4022 output, so as to adjust the position and direction of the surgical knife, so that the grinding machine body 204 can better grind the surgical knife. The second motor 4022 is driven to facilitate the turning of the surgical knife, thereby realizing the grinding and opening of both sides of the surgical knife. The multiple sets of positioning sensors 403 on the grinding table 401 can be used to detect whether the second motor 4022 drives the surgical knife to rotate to the corresponding position, so as to avoid the misalignment between the grinding machine body 204 and the surgical knife, thereby affecting the grinding efficiency and quality. The driving assembly 405 can drive the rotating shaft 404 to rotate, thereby driving the grinding table 401 and the multiple sets of surgical knives and the fixed assembly 402 on the top to adjust the position, so as to facilitate the feeding and discharging work of the feeding and discharging mechanism 3;

[0046] The utility model discloses a work principle: first can place the surgical knife of grinding to be placed on the placing rack 302 on the first sliding assembly component 301, can drive the placing rack 302 and the surgical knife on the placing rack 302 and carry out axial movement through the first sliding assembly component 301, send the surgical knife to the area of second sliding assembly component 303, then utilize the first pneumatic grabbing assembly 306 on two sets of third sliding assembly component 305 to the surgical knife and carry out clamping, can move the clamping surgical knife to grinding station mechanism 4 through two sets of third sliding assembly component 305 and second sliding assembly component 303 and fixed frame 304, when the surgical knife moves to grinding station mechanism 4, can place the handle of surgical knife on the handle support seat 4024 on the inclined seat 4021, then the blade part places to blade fixed seat 4025, utilize the pneumatic structure on blade fixed seat 4025, can fix the blade, after fixing, through the output of second motor 4022, can drive the handle support seat 4024 and blade fixed seat 4025 and carry out rotation through fixed rod 4023, adjust the position direction of surgical knife, so that the grinding machine body 204 better carries out the grinding processing of surgical knife, and through the drive of second motor 4022, it is convenient to turn over surgical knife, thereby realize the grinding of both sides of surgical knife, and utilize a plurality of positioning sensors 403 on grinding table 401, can be used for detecting whether second motor 4022 drives surgical knife to rotate to the corresponding position, avoid the misplacement between grinding machine body 204 and surgical knife, influence grinding efficiency and quality, and through the drive assembly 405 that is equipped with can drive rotating shaft 404 and rotate, thereby drive grinding table 401 and the plurality of surgical knives and fixed assembly 402 of top fixed carry out position adjustment, cooperate with the feeding mechanism 3 and carry out feeding and discharging work, after fixing, can adjust the position of grinding machine body 204 through the first moving assembly 201 and second moving assembly 202 and third moving assembly 203 on grinding mechanism 2, to ensure the accurate grinding of surgical knife, through the output drive of first motor 2012 on base 2011, can drive lead screw 2014 and rotate using synchronous wheel transmission part 2013, utilize slide rail 2016 and the slide block 2017 on slide rail 2016 and carry out limit guiding effect, can drive second moving assembly 202 and carry out axial movement using screw sleeve 2015 when lead screw 2014 rotates, similarly, utilize second moving assembly 202 to drive the third moving assembly 203 on top and move, and third moving assembly 203 can drive grinding machine body 204 and move, thereby complete the adjustment of different position direction of grinding machine body 204, to this complete the grinding of surgical knife whole open blade processing, when surgical knife grinding processing is completed, can through the second pneumatic grabbing assembly 308 on four sliding assembly component 307, the surgical knife of processing completion is clamped, through four sliding assembly component 307 and second sliding assembly component 303 can second pneumatic grabbing assembly 308,And the scalpel gripped by the second pneumatic grabbing assembly 308 is moved to the position of the placing rack 302, then the finished scalpel is placed on the placing rack 302, and the finished scalpel is moved to the designated area by the first sliding assembly 301, so that the staff can safely take the finished scalpel, the operation is more convenient, and through cooperation of the multiple sets of grinding mechanisms 2, the multiple sets of fixing assemblies 402 and related assemblies, multiple scalpel grinding and sharpening can be simultaneously performed, and the processing efficiency can be further improved.

[0047] The above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced equivalently; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the embodiments of the present application.

Claims

1. A medical scalpel sharpening apparatus, comprising: The application relates to a shell (1) provided with a plurality of sets of grinding mechanisms (2) in the interior of the shell (1), and the plurality of sets of grinding mechanisms (2) are arranged in a ring array. The plurality of sets of grinding mechanisms (2) each comprise a first moving assembly (201), the plurality of first moving assemblies (201) each comprise a base (2011) fixedly installed at the bottom of the inner cavity of the shell (1), one side of the base (2011) is fixedly installed with a first motor (2012), the first motor (2012) is fixedly installed with a synchronous wheel transmission component (2013) through an output shaft, one side of the synchronous wheel transmission component (2013) is further fixedly installed with a lead screw (2014), one end, away from the synchronous wheel transmission component (2013), of the lead screw (2014) is rotatably installed to the inner cavity side wall of the base (2011), the surface of the lead screw (2014) is threadedly connected with a threaded sleeve (2015), the top of the base (2011) is further fixedly installed with two sets of sliding rails (2016), and the surfaces of the two sets of sliding rails (2016) are each slidably installed with two sets of sliding blocks (2017). The inner cavity of the shell (1) is further provided with a feeding and discharging mechanism (3), one side of the feeding and discharging mechanism (3) is further provided with a grinding station mechanism (4), and the grinding station mechanism (4) is located at the central position of the plurality of sets of grinding mechanisms (2). The plurality of sets of grinding mechanisms (2) each further comprise a second moving assembly (202) and a third moving assembly (203), and the second moving assembly (202) and the third moving assembly (203) have the same structure as the first moving assembly (201).

2. The medical scalpel grinding and sharpening apparatus of claim 1, wherein, The bottom of the second moving assembly (202) is fixedly installed to the top of the threaded sleeve (2015), and the bottom of the second moving assembly (202) is further fixedly installed to the top of the two sets of sliding blocks (2017).

3. The medical scalpel sharpening apparatus of claim 2, wherein: The third moving assembly (203) is fixedly installed to the top of the second moving assembly (202), and one side of the plurality of third moving assemblies (203) is slidably installed with a grinding machine body (204). The feeding and discharging mechanism (3) comprises a first sliding assembly (301), the bottom of the first sliding assembly (301) is fixedly installed to the bottom of the inner cavity of the shell (1), and the top of the first sliding assembly (301) is slidably installed with a placing rack (302).

4. The medical scalpel sharpening apparatus of claim 3, wherein, The feeding and discharging mechanism (3) further comprises a second sliding assembly (303) arranged at one side of the first sliding assembly (301), the bottom of the second sliding assembly (303) is fixedly installed to the bottom of the inner cavity of the shell (1), and one side, close to the placing rack (302), of the second sliding assembly (303) is slidably installed with a fixing rack (304).

5. The medical scalpel sharpening apparatus of claim 4, wherein: Two sets of third sliding assemblies (305) are fixedly installed to one side, away from the second sliding assembly (303), of the fixing rack (304), and the two sets of third sliding assemblies (305) are each slidably installed with a first pneumatic grabbing assembly (306) away from the fixing rack (304).

6. The medical scalpel sharpening apparatus of claim 5, wherein: A fourth sliding assembly (307) is further fixedly installed to one side, away from the second sliding assembly (303), of the fixing rack (304), and the fourth sliding assembly (307) is slidably installed with a second pneumatic grabbing assembly (308) away from the fixing rack (304).

7. The medical scalpel sharpening apparatus of claim 6, wherein: ​ 8. The medical scalpel sharpening apparatus of claim 7, wherein: The grinding station mechanism (4) comprises a grinding table (401), and the inner cavity side wall of the grinding table (401) is fixedly installed with a plurality of groups of fixed assemblies (402) arranged in a ring array; Each of the plurality of groups of fixed assemblies (402) comprises an inclined seat (4021), the top of the inclined seat (4021) is fixedly installed with a second motor (4022), the second motor (4022) is fixedly installed with a fixed rod (4023) through an output shaft, the surface of the fixed rod (4023) is fixedly installed with a tool shank support seat (4024), one side of the tool shank support seat (4024) is provided with a cutting edge fixing seat (4025), the inner cavity side wall of the cutting edge fixing seat (4025) is fixedly installed on the surface of the fixed rod (4023), and the end, away from the second motor (4022), of the fixed rod (4023) is rotatably installed on the inner cavity side wall of the inclined seat (4021).

9. The medical scalpel sharpening apparatus of claim 8, wherein, A plurality of groups of positioning sensors (403) corresponding to the fixed assemblies (402) are also fixedly installed on the top of the grinding table (401); The inner cavity side wall of the grinding table (401) is also fixedly installed with a rotating shaft (404), the bottom of the rotating shaft (404) is fixedly installed with a driving assembly (405), and the bottom of the driving assembly (405) is fixedly installed on the inner cavity bottom of the shell (1).

Images